$ES
EVERSOURCE ENERGY Stock $es

$es Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-Q Financial Statement

#000007274112000080 Filed on November 07, 2012

Income Statement

Concept	2012 Q4	2012 Q3	2011 Q3
Revenue	$1.684B	$1.862B	$1.115B
YoY Change	57.68%	66.97%	-10.33%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$149.2M	$231.3M	$129.0M
YoY Change	87.91%	79.3%	-29.0%
% of Gross Profit
Operating Expenses	$1.353B	$1.449B	$911.1M
YoY Change	53.15%	59.0%	-12.71%
Operating Profit	$331.4M	$412.9M	$203.8M
YoY Change	79.23%	102.6%	2.1%
Interest Expense	-$84.10M	$90.36M	$63.93M
YoY Change	28.01%	41.34%	-2.98%
% of Operating Profit	-25.38%	21.88%	31.37%
Other Income/Expense, Net	$4.800M	$4.324M	$1.430M
YoY Change	-44.19%	202.38%	-85.87%
Pretax Income	$252.1M	$326.9M	$141.3M
YoY Change	97.26%	131.31%	-1.76%
Income Tax	$75.50M	$117.4M	$49.88M
% Of Pretax Income	29.95%	35.9%	35.3%
Net Earnings	$176.6M	$209.5M	$91.40M
YoY Change	53.83%	129.21%	-10.3%
Net Earnings / Revenue	10.49%	11.25%	8.2%
Basic Earnings Per Share		$0.66	$0.51
Diluted Earnings Per Share	$559.0K	$0.66	$0.51
COMMON SHARES
Basic Shares Outstanding	313.9M shares	314.8M shares	177.5M shares
Diluted Shares Outstanding		315.8M shares	177.8M shares

Balance Sheet

Concept	2012 Q4	2012 Q3	2011 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$46.00M	$155.0M	$91.00M
YoY Change	-41.03%	70.33%	-24.79%
Cash & Equivalents	$46.00M	$73.00M	$17.00M
Short-Term Investments		$82.00M	$75.00M
Other Short-Term Assets	$199.9M	$113.0M	$130.0M
YoY Change	77.52%	-13.11%	-61.99%
Inventory	$268.0M	$267.0M	$238.0M
Prepaid Expenses
Receivables	$792.8M	$773.4M	$494.6M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$2.227B	$2.139B	$1.327B
YoY Change	64.08%	61.14%	7.39%
LONG-TERM ASSETS
Property, Plant & Equipment	$16.61B	$16.30B	$10.10B
YoY Change	59.62%	61.49%	8.35%
Goodwill	$3.519B	$3.518B	$287.6M
YoY Change	1073.13%	1123.42%
Intangibles
YoY Change
Long-Term Investments	$400.0M	$394.0M	$52.00M
YoY Change	18947.62%	657.69%	13.04%
Other Assets	$327.8M	$300.8M	$168.0M
YoY Change	89.94%	79.03%	-95.07%
Total Long-Term Assets	$9.471B	$9.315B	$3.305B
YoY Change	143.68%	181.81%	-74.69%
TOTAL ASSETS
Total Short-Term Assets	$2.227B	$2.139B	$1.327B
Total Long-Term Assets	$9.471B	$9.315B	$3.305B
Total Assets	$28.30B	$27.76B	$14.73B
YoY Change	80.88%	88.46%	3.02%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$764.4M	$542.7M	$476.2M
YoY Change	20.7%	13.96%	5.59%
Accrued Expenses			$77.00M
YoY Change			-28.7%
Deferred Revenue
YoY Change
Short-Term Debt	$1.120B	$1.359B	$30.00M
YoY Change	253.31%	4430.0%	-80.77%
Long-Term Debt Due	$763.3M	$879.7M	$334.3M
YoY Change	130.21%	163.14%	406.56%
Total Short-Term Liabilities	$3.644B	$3.801B	$1.535B
YoY Change	87.08%	147.55%	45.25%
LONG-TERM LIABILITIES
Long-Term Debt	$7.200B	$6.733B	$4.615B
YoY Change	56.02%	45.89%	-5.49%
Other Long-Term Liabilities	$967.6M	$871.4M	$671.0M
YoY Change	130.37%	29.86%	-77.41%
Total Long-Term Liabilities	$7.984B	$7.791B	$4.373B
YoY Change	64.95%	78.13%	-44.32%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.644B	$3.801B	$1.535B
Total Long-Term Liabilities	$7.984B	$7.791B	$4.373B
Total Liabilities	$11.63B	$11.59B	$5.909B
YoY Change	71.3%	96.17%	-43.51%
SHAREHOLDERS EQUITY
Retained Earnings	$1.803B	$1.736B	$1.588B
YoY Change	9.13%	9.33%
Common Stock	$1.663B	$1.662B	$980.1M
YoY Change	69.6%	69.62%
Preferred Stock
YoY Change
Treasury Stock (at cost)	-$338.6M	-$340.7M	-$348.8M
YoY Change	-2.32%	-2.32%
Treasury Stock Shares	18.46M shares	18.57M shares	19.01M shares
Shareholders Equity	$9.237B	$9.177B	$3.956B
YoY Change
Total Liabilities & Shareholders Equity	$28.30B	$27.76B	$14.73B
YoY Change	80.88%	88.46%	3.01%

Cashflow Statement

Concept	2012 Q4	2012 Q3	2011 Q3
OPERATING ACTIVITIES
Net Income	$176.6M	$209.5M	$91.40M
YoY Change	53.83%	129.21%	-10.3%
Depreciation, Depletion And Amortization	$149.2M	$231.3M	$129.0M
YoY Change	87.91%	79.3%	-29.0%
Cash From Operating Activities	$365.2M	$475.6M	$201.7M
YoY Change	345.37%	135.8%	-34.89%
INVESTING ACTIVITIES
Capital Expenditures	-$390.5M	-$391.4M	-$280.6M
YoY Change	19.2%	39.49%	19.3%
Acquisitions
YoY Change
Other Investing Activities	-$16.10M	$19.80M	-$1.600M
YoY Change	-185.19%	-1337.5%	-76.12%
Cash From Investing Activities	-$406.6M	-$371.6M	-$282.2M
YoY Change	31.71%	31.68%	16.66%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	13.70M	-59.10M	82.00M
YoY Change	-93.68%	-172.07%	-170.93%
NET CHANGE
Cash From Operating Activities	365.2M	475.6M	201.7M
Cash From Investing Activities	-406.6M	-371.6M	-282.2M
Cash From Financing Activities	13.70M	-59.10M	82.00M
Net Change In Cash	-27.70M	44.90M	1.500M
YoY Change	177.0%	2893.33%	-103.14%
FREE CASH FLOW
Cash From Operating Activities	$365.2M	$475.6M	$201.7M
Capital Expenditures	-$390.5M	-$391.4M	-$280.6M
Free Cash Flow	$755.7M	$867.0M	$482.3M
YoY Change	84.5%	79.76%	-11.5%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	102144000	USD
CY2011Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.28
CY2012Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.34
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.97
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.83
	us-gaap	Depreciation Depreciation	369798000	USD
	us-gaap	Net Income Loss NetIncomeLoss	356482000	USD
CY2012Q3	us-gaap	Cash Cash	73449000	USD
CY2012Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	773415000	USD
CY2012Q3	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	182643000	USD
CY2012Q3	us-gaap	Energy Related Inventory EnergyRelatedInventory	267281000	USD
CY2012Q3	us-gaap	Other Assets Current OtherAssetsCurrent	112965000	USD
CY2012Q3	us-gaap	Assets Current AssetsCurrent	2138986000	USD
CY2011Q4	us-gaap	Cash Cash	6559000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	488002000	USD
CY2011Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	175207000	USD
CY2011Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	248958000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	112632000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	1357472000	USD
CY2012Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	5008034000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3267710000	USD
CY2012Q3	us-gaap	Goodwill Goodwill	3518454000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	287591000	USD
CY2012Q3	us-gaap	Marketable Securities Noncurrent MarketableSecuritiesNoncurrent	394207000	USD
CY2011Q4	us-gaap	Marketable Securities Noncurrent MarketableSecuritiesNoncurrent	60311000	USD
CY2012Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	93256000	USD
CY2011Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	98357000	USD
CY2012Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	300820000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	172560000	USD
CY2012Q3	us-gaap	Assets Noncurrent AssetsNoncurrent	9314771000	USD
CY2011Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	3886529000	USD
CY2012Q3	us-gaap	Assets Assets	27757562000	USD
CY2011Q4	us-gaap	Assets Assets	15647066000	USD
CY2012Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	647615000	USD
CY2011Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	255144000	USD
CY2012Q3	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	16303805000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	10403065000	USD
CY2012Q3	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	81618000	USD
CY2011Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	70970000	USD
CY2012Q3	us-gaap	Notes Payable To Bank Current NotesPayableToBankCurrent	1359250000	USD
CY2011Q4	us-gaap	Notes Payable To Bank Current NotesPayableToBankCurrent	317000000	USD
CY2012Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	879746000	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	331582000	USD
CY2012Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	542691000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	633282000	USD
CY2012Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	113907000	USD
CY2011Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	107558000	USD
CY2012Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	678523000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	390416000	USD
CY2012Q3	us-gaap	Liabilities Current LiabilitiesCurrent	3800723000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1947682000	USD
CY2012Q3	us-gaap	Secured Long Term Debt SecuredLongTermDebt	101347000	USD
CY2011Q4	us-gaap	Secured Long Term Debt SecuredLongTermDebt	112260000	USD
CY2012Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3429538000	USD
	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	1540110000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	1868316000	USD
CY2012Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	561555000	USD
CY2011Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	266145000	USD
CY2012Q3	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	912352000	USD
CY2011Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	959876000	USD
CY2012Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	871428000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	420011000	USD
CY2012Q3	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	7790522000	USD
CY2011Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	4840385000	USD
CY2012Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	6732536000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4614913000	USD
CY2012Q3	us-gaap	Temporary Equity Carrying Amount TemporaryEquityCarryingAmount	155568000	USD
CY2011Q4	us-gaap	Temporary Equity Carrying Amount TemporaryEquityCarryingAmount	116200000	USD
CY2012Q3	us-gaap	Common Stock Value CommonStockValue	1662358000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	980264000	USD
CY2012Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	6183715000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1797884000	USD
CY2012Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1735690000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1651875000	USD
CY2012Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	64209000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	70686000	USD
CY2012Q3	us-gaap	Treasury Stock Value TreasuryStockValue	-340688000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	-346667000	USD
CY2012Q3	us-gaap	Stockholders Equity StockholdersEquity	9176866000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	4012670000	USD
CY2012Q3	us-gaap	Minority Interest MinorityInterest	0	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	2956000	USD
CY2012Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9176866000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4015626000	USD
CY2012Q3	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	16064970000	USD
CY2011Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	8746739000	USD
CY2012Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	27757562000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	15647066000	USD
CY2012Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	226606000	USD
CY2011Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	167844000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	1326037000	USD
CY2012Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	2015649000	USD
	us-gaap	Revenues Revenues	4589835000	USD
CY2012Q3	us-gaap	Revenues Revenues	1861529000	USD
CY2011Q3	us-gaap	Revenues Revenues	1114892000	USD
	us-gaap	Revenues Revenues	3397624000	USD
CY2012Q3	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	602751000	USD
CY2011Q3	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	406237000	USD
	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	1285483000	USD
CY2012Q3	us-gaap	Depreciation Depreciation	144475000	USD
CY2011Q3	us-gaap	Depreciation Depreciation	75196000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	2178000	USD
	us-gaap	Depreciation Depreciation	222784000	USD
	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	74851000	USD
CY2012Q3	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	43835000	USD
CY2011Q3	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	36163000	USD
	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	86653000	USD
CY2012Q3	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	43044000	USD
CY2011Q3	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	17680000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	52047000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	319559000	USD
CY2012Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	120662000	USD
CY2011Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	84994000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	252817000	USD
	us-gaap	Operating Expenses OperatingExpenses	3803022000	USD
CY2012Q3	us-gaap	Operating Expenses OperatingExpenses	1448624000	USD
CY2011Q3	us-gaap	Operating Expenses OperatingExpenses	911076000	USD
	us-gaap	Operating Expenses OperatingExpenses	2788317000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	786813000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	412905000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	203816000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	609307000	USD
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	233352000	USD
CY2012Q3	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	86459000	USD
CY2011Q3	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	57461000	USD
	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	171905000	USD
	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	5168000	USD
CY2012Q3	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	1681000	USD
CY2011Q3	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	2018000	USD
	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	6889000	USD
	us-gaap	Interest Expense Other InterestExpenseOther	7336000	USD
CY2012Q3	us-gaap	Interest Expense Other InterestExpenseOther	2221000	USD
CY2011Q3	us-gaap	Interest Expense Other InterestExpenseOther	4453000	USD
	us-gaap	Interest Expense Other InterestExpenseOther	5922000	USD
	us-gaap	Interest Expense InterestExpense	245856000	USD
CY2012Q3	us-gaap	Interest Expense InterestExpense	90361000	USD
CY2011Q3	us-gaap	Interest Expense InterestExpense	63932000	USD
	us-gaap	Interest Expense InterestExpense	184716000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	14904000	USD
CY2012Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4324000	USD
CY2011Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1430000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	19077000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	555861000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	326868000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	141314000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	443668000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	199379000	USD
CY2012Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	117360000	USD
CY2011Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	49883000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	157934000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	209508000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	91431000	USD
	us-gaap	Net Income Loss NetIncomeLoss	285734000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	5253000	USD
CY2012Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1880000	USD
CY2011Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1470000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	4340000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	351229000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	207628000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	89961000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	281394000	USD
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	315805796	shares
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	177835348	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	265353377	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	177647694	shares
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	314806441	shares
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	177497862	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	264636636	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	177344481	shares
CY2012Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	395531000	USD
CY2011Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	255551000	USD
	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1187471000	USD
	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	788875000	USD
CY2012Q3	nu	Energyefficiencyandrenewableenergyprograms Energyefficiencyandrenewableenergyprograms	98326000	USD
CY2011Q3	nu	Energyefficiencyandrenewableenergyprograms Energyefficiencyandrenewableenergyprograms	35255000	USD
	nu	Energyefficiencyandrenewableenergyprograms Energyefficiencyandrenewableenergyprograms	209089000	USD
	nu	Energyefficiencyandrenewableenergyprograms Energyefficiencyandrenewableenergyprograms	99658000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	516000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-10678000	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	1455000	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-14600000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	217000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	280000	USD
	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	411000	USD
	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	424000	USD
CY2012Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	1445000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	975000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	4611000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease	2332000	USD
CY2012Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1880000	USD
CY2011Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1470000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	5253000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	4340000	USD
CY2012Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	209806000	USD
CY2011Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	80538000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	357706000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	269550000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	160209000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	5849000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	133528000	USD
CY2011Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-9423000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	6477000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-11844000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	24249000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	12435000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	186181000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	26236000	USD
	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	24245000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	103106000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-9702000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-14802000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	27677000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-61657000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-32887000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	4072000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-26302000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-109410000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-208308000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	66618000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	20145000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	9419000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	796005000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	888447000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1081750000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	749060000	USD
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	232911000	USD
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	116463000	USD
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	252762000	USD
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	118251000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-40265000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1061336000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-709856000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	267356000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	145865000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	5149000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	4169000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	654250000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-237000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	300000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	382000000	USD
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	95225000	USD
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	51198000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	13262000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4947000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	332221000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-185265000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	66890000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-6674000	USD
CY2010Q4	us-gaap	Cash Cash	23395000	USD
CY2011Q3	us-gaap	Cash Cash	16721000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	46841000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	267561000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	124086000	USD
	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	-237123000	USD
	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	-159220000	USD
	us-gaap	Increase Decrease In Fair Value Of Unhedged Derivative Instruments IncreaseDecreaseInFairValueOfUnhedgedDerivativeInstruments	7907000	USD
	us-gaap	Increase Decrease In Fair Value Of Unhedged Derivative Instruments IncreaseDecreaseInFairValueOfUnhedgedDerivativeInstruments	33767000	USD
	nu	Description Of Consolidation Of Yankee Cos DescriptionOfConsolidationOfYankeeCos	On April 10, 2012, upon consummation of the merger with NSTAR, NSTAR Electric's ownership in CYAPC and YAEC combined with CL&P's, PSNH's and WMECO's respective ownership interests in CYAPC and YAEC totaled greater than 50 percent, requiring NU to consolidate CYAPC and YAEC. The investment in CYAPC and YAEC had previously been accounted for under the equity method by NU. The consolidation of CYAPC and YAEC results in NU recording nuclear decommissioning trust marketable securities of $324.9 million, regulatory assets of $212.9 million, long-term debt associated with the long-term fuel disposal liabilities of $179.5 million, net accumulated deferred income tax liability of $58.8 million and asset retirement obligations related to decommissioning activity of $292.9 million as of September 30, 2012. At the NU consolidated level, intercompany transactions between CL&P, NSTAR Electric, PSNH and WMECO and CYAPC and YAEC have been eliminated in consolidation. For CL&P, NSTAR Electric, PSNH and WMECO, the investment in CYAPC and YAEC continue to be accounted for under the equity method.
CY2011Q3	nu	Reclassification Of Transmission Expense ReclassificationOfTransmissionExpense	6300000	USD
	nu	Reclassification Of Transmission Expense ReclassificationOfTransmissionExpense	71100000	USD
CY2011Q3	nu	Reclassification Of Energy Efficiency Expense ReclassificationOfEnergyEfficiencyExpense	35300000	USD
	nu	Reclassification Of Energy Efficiency Expense ReclassificationOfEnergyEfficiencyExpense	99700000	USD
	nu	Scheduleofreclassificationadjustments Scheduleofreclassificationadjustments	<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 10px"><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="5" style="width: 223px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:223px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">Transmission Expense</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="5" style="width: 221px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:221px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">Energy Efficiency Expense</font></td></tr><tr style="height: 10px"><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 115px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:115px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">Three Months Ended</font></td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 98px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:98px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">Nine Months Ended</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 115px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:115px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">Three Months Ended</font></td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 96px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">Nine Months Ended</font></td></tr><tr style="height: 11px"><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"><font style="FONT-STYLE: italic;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;">(Millions of Dollars)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 115px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:115px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2011</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 98px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:98px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2011</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 115px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:115px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2011</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 96px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2011</font></td></tr><tr style="height: 10px"><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">NU</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 106px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:106px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">6.3</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 88px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:88px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">71.1</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 106px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:106px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">35.3</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 86px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:86px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">99.7</font></td></tr><tr style="height: 10px"><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">CL&P</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 106px; text-align:right;border-color:#000000;min-width:106px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">8.7</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 88px; text-align:right;border-color:#000000;min-width:88px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">48.5</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 106px; text-align:right;border-color:#000000;min-width:106px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">24.9</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 86px; text-align:right;border-color:#000000;min-width:86px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">69.6</font></td></tr><tr style="height: 10px"><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">PSNH</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 106px; text-align:right;border-color:#000000;min-width:106px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">(0.3)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 88px; text-align:right;border-color:#000000;min-width:88px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">12.7</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 106px; text-align:right;border-color:#000000;min-width:106px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">3.7</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 86px; text-align:right;border-color:#000000;min-width:86px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">9.6</font></td></tr><tr style="height: 10px"><td style="width: 87px; text-align:left;border-color:#000000;min-width:87px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">WMECO</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 106px; text-align:right;border-color:#000000;min-width:106px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">2.1</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 88px; text-align:right;border-color:#000000;min-width:88px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">12.4</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 106px; text-align:right;border-color:#000000;min-width:106px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">6.1</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 86px; text-align:right;border-color:#000000;min-width:86px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">16.5</font></td></tr></table></div>
CY2012Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	10300000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	17900000	USD
	nu	Description Of Change In Estimate DescriptionOfChangeInEstimate	Effective January 1, 2012, NSTAR Electric increased its estimates with respect to the allowance for doubtful accounts, incurred but not reported claims on medical benefits, general and workers' compensation liabilities and various compensation accruals. The total aggregate impact of these increases in estimates to NSTAR Electric's accompanying unaudited condensed consolidated statements was $11.4 million, after-tax, for the first quarter and first nine months of 2012.
CY2012Q3	nu	Cash Collateral Posted CashCollateralPosted	19900000	USD
CY2011Q4	nu	Cash Collateral Posted CashCollateralPosted	10900000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	34900000	USD
CY2012Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	91700000	USD
CY2012Q3	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	36400000	USD
CY2011Q3	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	35000000	USD
	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	102000000	USD
	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	105800000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	139900000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	121700000	USD
CY2012Q2	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	314000000	shares
CY2012Q2	nu	Number Of Nstar Shares Outstanding NumberOfNstarSharesOutstanding	103696000	shares
CY2012Q2	nu	Exchange Ratio ExchangeRatio	1.312	pure
CY2012Q2	us-gaap	Business Acquisition Equity Interests Issued Or Issuable Number Of Shares Issued BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued	136049000	shares
CY2012Q2	nu	Business Acquisition Share Price BusinessAcquisitionSharePrice	36.79
CY2012Q2	us-gaap	Business Acquisition Cost Of Acquired Entity Equity Interests Issued And Issuable BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuable	5005000000	USD
CY2012Q2	us-gaap	Business Acquisition Cost Of Acquired Entity Other Noncash Consideration BusinessAcquisitionCostOfAcquiredEntityOtherNoncashConsideration	33000000	USD
CY2012Q2	us-gaap	Business Acquisition Cost Of Acquired Entity Purchase Price BusinessAcquisitionCostOfAcquiredEntityPurchasePrice	5038000000	USD
CY2012Q2	us-gaap	Business Acquisition Percentage Of Voting Interests Acquired BusinessAcquisitionPercentageOfVotingInterestsAcquired	1.00	pure
	nu	Business Acquisition Number Of Shares Awards Vested Immediately Prior To Merger BusinessAcquisitionNumberOfSharesAwardsVestedImmediatelyPriorToMerger	109000	shares
CY2012Q3	us-gaap	Business Acquisition Purchase Price Allocation Current Assets BusinessAcquisitionPurchasePriceAllocationCurrentAssets	754000000	USD
CY2012Q3	us-gaap	Business Acquisition Purchase Price Allocation Property Plant And Equipment BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment	5155000000	USD
CY2012Q3	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Amount BusinessAcquisitionPurchasePriceAllocationGoodwillAmount	3231000000	USD
CY2012Q3	us-gaap	Business Acquisition Purchase Price Allocation Other Noncurrent Assets BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentAssets	2115000000	USD
CY2012Q3	us-gaap	Business Acquisition Purchase Price Allocation Current Liabilities BusinessAcquisitionPurchasePriceAllocationCurrentLiabilities	1332000000	USD
CY2012Q3	us-gaap	Business Acquisition Purchase Price Allocation Other Noncurrent Liabilities BusinessAcquisitionPurchasePriceAllocationOtherNoncurrentLiabilities	2723000000	USD
CY2012Q3	us-gaap	Business Acquisition Purchase Price Allocation Noncurrent Liabilities Long Term Debt BusinessAcquisitionPurchasePriceAllocationNoncurrentLiabilitiesLongTermDebt	2123000000	USD
CY2012Q3	nu	Business Aquisition Purchase Price Allocation Preferred Stock BusinessAquisitionPurchasePriceAllocationPreferredStock	39000000	USD
CY2012Q3	us-gaap	Business Acquisition Cost Of Acquired Entity Purchase Price BusinessAcquisitionCostOfAcquiredEntityPurchasePrice	5038000000	USD
CY2012Q3	us-gaap	Business Combination Goodwill Recognized Segment Allocation BusinessCombinationGoodwillRecognizedSegmentAllocation	Goodwill Allocation: NU's reporting units consist of the combined Electric Distribution, Electric Transmission and Natural Gas Distribution. The preliminary estimate of goodwill from the merger with NSTAR of $3.2 billion has been assigned to NU's reporting units based on relative fair values. As of September 30, 2012, the preliminary allocation of goodwill to each reporting unit was $2.3 billion to Electric Distribution, $0.7 billion to Electric Transmission and $0.5 billion to Natural Gas Distribution, including $0.3 billion of pre-existing goodwill applicable to Yankee Gas. NU's reporting units are consistent with its reportable business segments.
CY2012Q3	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	1862000000	USD
CY2012Q3	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	208000000	USD
CY2011Q3	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.61
	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	1.45
	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	1.44
CY2011Q3	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	1883000000	USD
CY2011Q3	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	190000000	USD
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	5321000000	USD
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	455000000	USD
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	5637000000	USD
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	518000000	USD
CY2012Q3	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.66
CY2012Q3	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.66
CY2011Q3	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.60
	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	1.65
	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	1.64
CY2012Q3	nu	Businesscombinationaftertaxtransactioncosts Businesscombinationaftertaxtransactioncosts	1000000	USD
CY2012Q3	nu	Aftertaxsettlementcostsincurred Aftertaxsettlementcostsincurred	0	USD
CY2012Q3	nu	Aftertaxcostsincurredinconnectionwithmerger Aftertaxcostsincurredinconnectionwithmerger	1000000	USD
CY2011Q3	nu	Businesscombinationaftertaxtransactioncosts Businesscombinationaftertaxtransactioncosts	1000000	USD
CY2011Q3	nu	Aftertaxsettlementcostsincurred Aftertaxsettlementcostsincurred	0	USD
CY2011Q3	nu	Aftertaxcostsincurredinconnectionwithmerger Aftertaxcostsincurredinconnectionwithmerger	1000000	USD
	nu	Businesscombinationaftertaxtransactioncosts Businesscombinationaftertaxtransactioncosts	31000000	USD
	nu	Aftertaxsettlementcostsincurred Aftertaxsettlementcostsincurred	60000000	USD
	nu	Aftertaxcostsincurredinconnectionwithmerger Aftertaxcostsincurredinconnectionwithmerger	91000000	USD
	nu	Businesscombinationaftertaxtransactioncosts Businesscombinationaftertaxtransactioncosts	17000000	USD
	nu	Aftertaxsettlementcostsincurred Aftertaxsettlementcostsincurred	0	USD
	nu	Aftertaxcostsincurredinconnectionwithmerger Aftertaxcostsincurredinconnectionwithmerger	17000000	USD
	nu	Business Aquisition Description Of Settlement Agreements BusinessAquisitionDescriptionOfSettlementAgreements	Regulatory Approvals: On February 15, 2012, NU and NSTAR reached comprehensive settlement agreements with the Massachusetts Attorney General and the DOER related to the merger. On April 4, 2012, the DPU approved the settlement agreements and the merger of NU and NSTAR. On March 13, 2012, NU and NSTAR reached a comprehensive settlement agreement with both the Connecticut Attorney General and the Connecticut Office of Consumer Counsel. On April 2, 2012, the PURA approved the settlement agreement and the merger of NU and NSTAR. The settlement agreements included base distribution rate freezes until December 1, 2014 for CL&P and through 2015 for NSTAR Electric, NSTAR Gas and WMECO.
	nu	Customerratecreditsforbusinesscombination Customerratecreditsforbusinesscombination	46000000	USD
	nu	Stormcostdeferralreduction Stormcostdeferralreduction	40000000	USD
	nu	Energyefficiencyfundestablishment Energyefficiencyfundestablishment	15000000	USD
	nu	Totalimpactofsettlementagreements Totalimpactofsettlementagreements	101000000	USD
CY2011Q4	us-gaap	Regulatory Assets RegulatoryAssets	3522800000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	3155700000	USD
CY2012Q3	us-gaap	Regulatory Assets RegulatoryAssets	5655600000	USD
	us-gaap	Description Of Regulatory Costs Not Yet Approved DescriptionOfRegulatoryCostsNotYetApproved	Regulatory Costs Not Yet Approved: Additionally, the Regulated companies had $57 million ($4.1 million for CL&P, $24.4 million for NSTAR Electric, $23.4 million for PSNH and $1.6 million for WMECO) and $32.4 million ($5 million for CL&P, $22.4 million for PSNH and $1.6 million for WMECO) of regulatory costs as of September 30, 2012 and December 31, 2011, respectively, which were included in Other Long-Term Assets on the accompanying unaudited condensed consolidated balance sheets. For comparative purposes, NSTAR Electric had $9.5 million of such regulatory costs as of December 31, 2011. These amounts represent incurred costs that have not yet been approved for recovery by the applicable regulatory agency. Management believes it is probable that these costs will be recovered in future cost-of-service regulated rates.
CY2012Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	788200000	USD
CY2011Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	433900000	USD
CY2012Q3	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	11275000000	USD
CY2012Q3	nu	Public Utilities Property Plant And Equipment Distribution Natural Gas PublicUtilitiesPropertyPlantAndEquipmentDistributionNaturalGas	2198400000	USD
CY2012Q3	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	5127300000	USD
CY2012Q3	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	1147300000	USD
CY2012Q3	nu	Public Utilities Property Plant And Equipment Electric And Natural Gas Utility Total PublicUtilitiesPropertyPlantAndEquipmentElectricAndNaturalGasUtilityTotal	19748000000	USD
CY2012Q3	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	20180900000	USD
CY2012Q3	nu	Electric And Natural Gas Utility Accumulated Depreciation ElectricAndNaturalGasUtilityAccumulatedDepreciation	4990400000	USD
CY2012Q3	nu	Other Accumulated Depreciation OtherAccumulatedDepreciation	166600000	USD
CY2012Q3	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	5157000000	USD
CY2012Q3	nu	Property Plant And Equipment Net Excluding Construction Work In Progress PropertyPlantAndEquipmentNetExcludingConstructionWorkInProgress	15023900000	USD
CY2012Q3	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	1279900000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	6540400000	USD
CY2011Q4	nu	Public Utilities Property Plant And Equipment Distribution Natural Gas PublicUtilitiesPropertyPlantAndEquipmentDistributionNaturalGas	1247600000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	3541900000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	1096000000	USD
CY2011Q4	nu	Public Utilities Property Plant And Equipment Electric And Natural Gas Utility Total PublicUtilitiesPropertyPlantAndEquipmentElectricAndNaturalGasUtilityTotal	12425900000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	12731000000	USD
CY2011Q4	nu	Electric And Natural Gas Utility Accumulated Depreciation ElectricAndNaturalGasUtilityAccumulatedDepreciation	3035500000	USD
CY2011Q4	nu	Other Accumulated Depreciation OtherAccumulatedDepreciation	120200000	USD
CY2011Q4	nu	Property Plant And Equipment Net Excluding Construction Work In Progress PropertyPlantAndEquipmentNetExcludingConstructionWorkInProgress	9575300000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	827800000	USD
CY2012Q3	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	432900000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	305100000	USD
CY2012Q3	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	15800000	USD
CY2011Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	23500000	USD
CY2011Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	4100000	USD
CY2011Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	19900000	USD
	us-gaap	Description Of Derivative Activity Volume DescriptionOfDerivativeActivityVolume	NU also has NYMEX future contracts in order to reduce variability associated with the purchase price of approximately 9.1 million MMBtu of natural gas.
CY2012Q3	nu	Current Derivative Assets Consolidated CurrentDerivativeAssetsConsolidated	13300000	USD
CY2011Q4	nu	Current Derivative Assets Consolidated CurrentDerivativeAssetsConsolidated	11000000	USD
	nu	Interest Realized In Earnings On Fair Value Hedge InterestRealizedInEarningsOnFairValueHedge	2500000	USD
	nu	Interest Realized In Earnings On Fair Value Hedge InterestRealizedInEarningsOnFairValueHedge	7900000	USD
	us-gaap	Description Of Cash Flow Hedge Activity DescriptionOfCashFlowHedgeActivity	In 2011, PSNH and WMECO settled interest rate swaps associated with $280 million and $50 million, respectively, of long-term debt issuances and as a result PSNH and WMECO recorded pre-tax reductions of $18.2 million and $6.9 million, respectively, to AOCI that are being amortized over the remaining lives of the associated debt.
CY2012Q3	us-gaap	Cash Flow Hedge Gain Loss Reclassified To Interest Expense Net CashFlowHedgeGainLossReclassifiedToInterestExpenseNet	900000	USD
	us-gaap	Cash Flow Hedge Gain Loss Reclassified To Interest Expense Net CashFlowHedgeGainLossReclassifiedToInterestExpenseNet	2400000	USD
CY2011Q3	us-gaap	Cash Flow Hedge Gain Loss Reclassified To Interest Expense Net CashFlowHedgeGainLossReclassifiedToInterestExpenseNet	400000	USD
	us-gaap	Cash Flow Hedge Gain Loss Reclassified To Interest Expense Net CashFlowHedgeGainLossReclassifiedToInterestExpenseNet	600000	USD
CY2011Q3	nu	Interest Realized In Earnings On Fair Value Hedge InterestRealizedInEarningsOnFairValueHedge	2500000	USD
CY2012Q3	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	1300000	USD
CY2012Q3	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	15700000	USD
	nu	Fairvalueinputsliabilitiesquantitativeinformationtabletextblock Fairvalueinputsliabilitiesquantitativeinformationtabletextblock	<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:142px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">Range</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">Period Covered</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="TEXT-DECORATION: underline;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">Energy Prices:</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:142px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:96px;"> </td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> NU</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$41 - $90 per MWh</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2017 - 2028</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> CL&P</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$47 - $55 per MWh</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2017 - 2020</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> WMECO</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$41 - $90 per MWh</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2017 - 2028</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"> </td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="TEXT-DECORATION: underline;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">Capacity Prices:</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"> </td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> NU</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$1.40 - $10.53 per kW-Month</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2016 - 2028</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> CL&P</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$1.40 - $9.51 per kW-Month</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2016 - 2026</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> NSTAR Electric</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$1.40 - $10.18 per kW-Month</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2016 - 2027</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> WMECO</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$1.40 - $10.53 per kW-Month</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2016 - 2028</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"> </td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="TEXT-DECORATION: underline;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">Forward Reserve:</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"> </td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> NU, CL&P</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$0.35 - $0.90 per kW-Month</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2013 - 2024</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"> </td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="TEXT-DECORATION: underline;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">REC Prices:</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"> </td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;"> NU</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$25 - $85 per REC</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2012 - 2028</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;"> NSTAR Electric</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$25 - $63 per REC</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2012 - 2017</font></td></tr><tr style="height: 9px"><td style="width: 120px; text-align:left;border-color:#000000;min-width:120px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;"> WMECO</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 142px; text-align:left;border-color:#000000;min-width:142px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$25 - $85 per REC</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 96px; text-align:center;border-color:#000000;min-width:96px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">2013 - 2028</font></td></tr></table></div>
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	7200000	USD
	nu	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Reg Asset Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInRegAssetLiability	-30100000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	56000000	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	902300000	USD
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	916100000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	16100000	USD
	nu	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Reg Asset Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInRegAssetLiability	-93000000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	1000000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	962200000	USD
CY2011Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	886200000	USD
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	300000	USD
CY2011Q3	nu	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Reg Asset Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInRegAssetLiability	-47900000	USD
CY2011Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	17700000	USD
CY2012Q3	nu	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Reg Asset Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInRegAssetLiability	8500000	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	-200000	USD
CY2012Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	21500000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3	32200000	USD
CY2010Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	840200000	USD
CY2012Q3	nu	Derivative Liability Recorded At Merger Date DerivativeLiabilityRecordedAtMergerDate	5400000	USD
	nu	Rollforward Of Net Derivative Asset Liabilities Valued Using Unobservable Inputs RollforwardOfNetDerivativeAssetLiabilitiesValuedUsingUnobservableInputs	<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 9px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 215px; text-align:left;border-color:#000000;min-width:215px;"> <sup></sup></td><td colspan="5" style="width: 198px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:198px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">For the Three Months Ended</font></td><td style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"> </td><td colspan="5" style="width: 198px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:198px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">For the Nine Months Ended</font></td></tr><tr style="height: 9px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 215px; text-align:left;border-color:#000000;min-width:215px;"> <sup></sup></td><td colspan="2" style="width: 94px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:94px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2012</font></td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 94px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:94px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2011</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 94px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:94px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2012</font></td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 94px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:94px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2011</font></td></tr><tr style="height: 9px"><td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"><font style="FONT-STYLE: italic;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: left;">(Millions of Dollars)</font><sup></sup></td><td colspan="2" style="width: 94px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:94px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">NU</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 94px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:94px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">NU</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 94px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:94px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">NU</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 94px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:94px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">NU</font></td></tr><tr style="height: 9px"><td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"><font style="TEXT-DECORATION: underline;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Derivatives, Net: </font><sup></sup></td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:84px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:84px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:84px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:84px;"> </td></tr><tr style="height: 9px"><td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Fair Value as of Beginning of Period</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$</font></td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (932.1)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$</font></td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (886.2)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$</font></td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (962.2)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$</font></td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (840.2)</font></td></tr><tr style="height: 9px"><td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Increase due to Merger with NSTAR</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> -</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> -</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (5.4)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> -</font></td></tr><tr style="height: 9px"><td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Transfer to Level 2</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> -</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> -</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 32.2</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> -</font></td></tr><tr style="height: 24px"><td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Net Realized/Unrealized Gains/(Losses) Included in: </font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:left;border-color:#000000;min-width:84px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:left;border-color:#000000;min-width:84px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:left;border-color:#000000;min-width:84px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:left;border-color:#000000;min-width:84px;"> </td></tr><tr style="height: 9px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 215px; text-align:left;border-color:#000000;min-width:215px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;"> Net Income</font><sup> (2)</sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (0.2)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 0.3</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 7.2</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 1.0</font></td></tr><tr style="height: 9px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 215px; text-align:left;border-color:#000000;min-width:215px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;"> Regulatory Assets</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 8.5</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (47.9)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (30.1)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (93.0)</font></td></tr><tr style="height: 9px"><td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Settlements</font><sup></sup></td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 21.5</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 17.7</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 56.0</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 16.1</font></td></tr><tr style="height: 9px"><td colspan="2" style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Fair Value as of End of Period</font><sup></sup></td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$</font></td><td style="width: 84px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (902.3)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$</font></td><td style="width: 84px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (916.1)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$</font></td><td style="width: 84px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (902.3)</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:10px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$</font></td><td style="width: 84px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:84px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (916.1)</font></td></tr><tr style="height: 9px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 215px; text-align:left;border-color:#000000;min-width:215px;"> <sup></sup></td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:84px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:84px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:84px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 84px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:84px;"> </td></tr></table></div><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 11px"><td style="width: 7px; text-align:left;border-color:#000000;min-width:7px;"> </td><td style="width: 200px; text-align:left;border-color:#000000;min-width:200px;"> </td><td colspan="14" style="width: 436px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:436px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">For the Three Months Ended</font><sup></sup></td></tr><tr style="height: 11px"><td style="width: 7px; text-align:left;border-color:#000000;min-width:7px;"> </td><td style="width: 200px; text-align:left;border-color:#000000;min-width:200px;"> </td><td colspan="8" style="width: 247px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:247px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2012</font></td><td style="width: 17px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:17px;"> </td><td colspan="5" style="width: 172px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:172px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2011</font><sup></sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="FONT-STYLE: italic;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: left;">(Millions of Dollars)</font></td><td colspan="2" style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:64px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">CL&P</font></td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:87px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">NSTAR Electric</font><sup></sup></td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 77px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:77px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">WMECO</font></td><td style="width: 17px; text-align:center;border-color:#000000;min-width:17px;"> </td><td colspan="2" style="width: 75px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:75px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">CL&P</font></td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 88px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:88px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">NSTAR Electric</font><sup> (1)</sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="TEXT-DECORATION: underline;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Derivatives, Net: </font></td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 55px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:55px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 78px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:78px;"> <sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:13px;"> </td><td style="width: 64px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:64px;"> </td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:11px;"> </td><td style="width: 64px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:64px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 76px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:76px;"> <sup></sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Fair Value as of Beginning of Period</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (910.7)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 78px; text-align:right;border-color:#000000;min-width:78px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (15.8)</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (13.5)</font></td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; text-align:left;border-color:#000000;min-width:11px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (858.7)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 76px; text-align:right;border-color:#000000;min-width:76px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (1.0)</font><sup></sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Net Realized/Unrealized Gains/(Losses)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 55px; text-align:left;border-color:#000000;min-width:55px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 78px; text-align:left;border-color:#000000;min-width:78px;"> <sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"> </td><td style="width: 64px; text-align:left;border-color:#000000;min-width:64px;"> </td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; text-align:left;border-color:#000000;min-width:11px;"> </td><td style="width: 64px; text-align:left;border-color:#000000;min-width:64px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 76px; text-align:left;border-color:#000000;min-width:76px;"> <sup></sup></td></tr><tr style="height: 11px"><td style="width: 7px; text-align:left;border-color:#000000;min-width:7px;"> </td><td style="width: 200px; text-align:left;border-color:#000000;min-width:200px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">Included in Regulatory Assets</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (2.8)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 78px; text-align:right;border-color:#000000;min-width:78px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 1.4</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"> </td><td style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 9.8</font></td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; text-align:left;border-color:#000000;min-width:11px;"> </td><td style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (47.9)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 76px; text-align:right;border-color:#000000;min-width:76px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (1.2)</font><sup></sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Settlements</font></td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 55px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:55px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 22.6</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 78px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:78px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 0.6</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:13px;"> </td><td style="width: 64px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> -</font></td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:11px;"> </td><td style="width: 64px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 15.5</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 76px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:76px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 0.6</font><sup></sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Fair Value as of End of Period</font></td><td style="width: 9px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 55px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:55px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (890.9)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 78px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:78px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (13.8)</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:13px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (3.7)</font></td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:11px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (891.1)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 76px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:76px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (1.6)</font><sup></sup></td></tr><tr style="height: 11px"><td style="width: 7px; text-align:left;border-color:#000000;min-width:7px;"> </td><td style="width: 200px; text-align:left;border-color:#000000;min-width:200px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 55px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:55px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 78px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:78px;"> <sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:13px;"> </td><td style="width: 64px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:64px;"> </td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:11px;"> </td><td style="width: 64px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:64px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 76px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:76px;"> <sup></sup></td></tr><tr style="height: 11px"><td style="width: 7px; text-align:left;border-color:#000000;min-width:7px;"> </td><td style="width: 200px; text-align:left;border-color:#000000;min-width:200px;"> </td><td colspan="14" style="width: 436px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:436px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">For the Nine Months Ended</font><sup></sup></td></tr><tr style="height: 11px"><td style="width: 7px; text-align:left;border-color:#000000;min-width:7px;"> </td><td style="width: 200px; text-align:left;border-color:#000000;min-width:200px;"> </td><td colspan="8" style="width: 247px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:247px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2012</font></td><td style="width: 17px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:17px;"> </td><td colspan="5" style="width: 172px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:172px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">September 30, 2011</font><sup></sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="FONT-STYLE: italic;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: left;">(Millions of Dollars)</font></td><td colspan="2" style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:64px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">CL&P</font></td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 87px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:87px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">NSTAR Electric</font><sup> (1)</sup></td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:10px;"> </td><td colspan="2" style="width: 77px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:77px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">WMECO</font></td><td style="width: 17px; text-align:center;border-color:#000000;min-width:17px;"> </td><td colspan="2" style="width: 75px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:75px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">CL&P</font></td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 88px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:88px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Arial;FONT-SIZE: 7pt;COLOR: #000000;TEXT-ALIGN: center;">NSTAR Electric</font><sup> (1)</sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="TEXT-DECORATION: underline;FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Derivatives, Net: </font></td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 55px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:55px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 78px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:78px;"> <sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:13px;"> </td><td style="width: 64px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:64px;"> </td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:11px;"> </td><td style="width: 64px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:64px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 76px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:76px;"> <sup></sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Fair Value as of Beginning of Period</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (931.6)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 78px; text-align:right;border-color:#000000;min-width:78px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (3.4)</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (7.3)</font></td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; text-align:left;border-color:#000000;min-width:11px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">$</font></td><td style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (806.1)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 76px; text-align:right;border-color:#000000;min-width:76px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (2.4)</font><sup></sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Net Realized/Unrealized Gains/(Losses)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 55px; text-align:left;border-color:#000000;min-width:55px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 78px; text-align:left;border-color:#000000;min-width:78px;"> <sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"> </td><td style="width: 64px; text-align:left;border-color:#000000;min-width:64px;"> </td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; text-align:left;border-color:#000000;min-width:11px;"> </td><td style="width: 64px; text-align:left;border-color:#000000;min-width:64px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 76px; text-align:left;border-color:#000000;min-width:76px;"> <sup></sup></td></tr><tr style="height: 11px"><td style="width: 7px; text-align:left;border-color:#000000;min-width:7px;"> </td><td style="width: 200px; text-align:left;border-color:#000000;min-width:200px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">Included in Regulatory Assets</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 55px; text-align:right;border-color:#000000;min-width:55px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (23.8)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 78px; text-align:right;border-color:#000000;min-width:78px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (13.2)</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; text-align:left;border-color:#000000;min-width:13px;"> </td><td style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 3.6</font></td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; text-align:left;border-color:#000000;min-width:11px;"> </td><td style="width: 64px; text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (92.9)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 76px; text-align:right;border-color:#000000;min-width:76px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (1.3)</font><sup></sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Settlements</font></td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 55px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:55px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 64.5</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 78px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:78px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 2.8</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:13px;"> </td><td style="width: 64px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> -</font></td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:11px;"> </td><td style="width: 64px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 7.9</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 76px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:76px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> 2.1</font><sup></sup></td></tr><tr style="height: 11px"><td colspan="2" style="width: 207px; text-align:left;border-color:#000000;min-width:207px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: left;">Fair Value as of End of Period</font></td><td style="width: 9px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 55px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:55px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (890.9)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 78px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:78px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (13.8)</font><sup></sup></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 13px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:13px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (3.7)</font></td><td style="width: 17px; text-align:left;border-color:#000000;min-width:17px;"> </td><td style="width: 11px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:11px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 64px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:64px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (891.1)</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;">$</font></td><td style="width: 76px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:76px;"><font style="FONT-FAMILY: Arial;FONT-SIZE: 8pt;COLOR: #000000;"> (1.6)</font><sup></sup></td></tr></table></div>
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	932100000	USD
CY2011Q3	us-gaap	Fair Value Option Changes In Fair Value Gain Loss FairValueOptionChangesInFairValueGainLoss	-7100000	USD
	us-gaap	Fair Value Option Changes In Fair Value Gain Loss FairValueOptionChangesInFairValueGainLoss	-4900000	USD
CY2012Q3	nu	Fair Value Of Securities Under Fair Value Option FairValueOfSecuritiesUnderFairValueOption	45700000	USD
CY2011Q4	nu	Fair Value Of Securities Under Fair Value Option FairValueOfSecuritiesUnderFairValueOption	41100000	USD
CY2012Q3	us-gaap	Fair Value Option Changes In Fair Value Gain Loss FairValueOptionChangesInFairValueGainLoss	1900000	USD
	us-gaap	Fair Value Option Changes In Fair Value Gain Loss FairValueOptionChangesInFairValueGainLoss	4600000	USD
CY2012Q3	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	475800000	USD
CY2011Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	131300000	USD
	nu	Working Capital Discussion WorkingCapitalDiscussion	NU, CL&P, NSTAR Electric, PSNH and WMECO use their available capital resources to fund their respective construction expenditures, meet debt requirements, to pay costs, including storm-related costs, and dividends and to fund other corporate obligations, such as pension contributions. The current growth in NU’s transmission construction expenditures utilizes a significant amount of cash for projects that have a long-term return on investment and recovery period. In addition, NU’s Regulated companies operate in an environment where recovery of its electric and gas distribution construction expenditures takes place over an extended period of time. This impacts the timing of the revenue stream designed to fully recover the total investment plus a return on the equity portion of the cost and related financing costs. These factors have resulted in NU’s current liabilities exceeding current assets by approximately $1.7 billion, $558 million, $111 million and $217 million at NU, CL&P, NSTAR Electric and WMECO, respectively, as of September 30, 2012.As of September 30, 2012, approximately $880 million of NU's current liabilities relates to long-term debt that will be paid in the next 12 months. NU, with credit ratings among the highest in the industry, has several options available in the financial markets to repay or refinance these maturities with the issuance of new long-term debt. NU, CL&P, NSTAR Electric, and WMECO will reduce their short-term borrowings with cash received from operating cash flows or with the issuance of new long-term debt, as deemed appropriate given capital requirements and maintenance of NU's credit rating and profile. Management expects the future operating cash flows of NU and its subsidiaries, along with the access to financial markets, will be sufficient to meet any future operating requirements and capital investment forecasted opportunities
	us-gaap	Long Term Debt Description LongTermDebtDescription	8.        LONG-TERM DEBT (NU, CL&P, NSTAR Electric, WMECO) On March 22, 2012, NU parent issued $300 million of floating rate Series D Senior Notes with a maturity date of September 20, 2013. The notes have a coupon rate based on the three-month LIBOR rate plus a credit spread of 0.75 percent and will reset quarterly. The notes had an interest rate of 1.13 percent as of September 30, 2012. The proceeds, net of issuance expenses, were used to repay at maturity the NU parent $263 million Series A Senior Notes that matured on April 1, 2012, to repay short-term borrowings outstanding under the NU parent Credit Agreement and for other general corporate purposes. The indenture under which the bonds were issued requires NU to comply with certain covenants as are customarily included in such indentures. On April 2, 2012, CL&P remarketed $62 million of tax-exempt PCRBs for a three-year period. The PCRBs, which mature on May 1, 2031, carry a coupon rate of 1.55 percent during the current three-year fixed rate period and are subject to mandatory tender for purchase on April 1, 2015. On April 2, 2012, NU parent repaid its $263 million 7.25 percent Series A Senior Notes that matured on April 1, 2012 with the proceeds from the issuance of floating rate Series D Senior Notes issued on March 22, 2012. In addition, as a result of consolidating CYAPC and YAEC, NU has consolidated $179.5 million in additional spent nuclear fuel obligations as of September 30, 2012. The spent nuclear fuel obligation is payable to the DOE at any time prior to the first delivery to the DOE of spent nuclear fuel and radio-active waste used to generate electricity prior to April 7, 1983. Until payment is made to the DOE, the outstanding liability will continue to accrue interest at the 3-month Treasury bill yield rate. NU, including CL&P, NSTAR Electric, PSNH and WMECO, was in compliance with all its debt covenants as of September 30, 2012. On October 1, 2012, CL&P redeemed at par four different series of tax-exempt PCRBs totaling $116.4 million. The PCRBs carried coupons that ranged from 5.85 percent to 5.95 percent and maturities that ranged from 2016 through 2028. On October 1, 2012, WMECO redeemed at par $53.8 million of tax-exempt PCRBs. The PCRBs had a maturity date of 2028 and a coupon of 5.85 percent. On October 4, 2012, WMECO issued at a premium $150 million of senior unsecured notes at a yield of 2.673 percent that will mature on September 15, 2021. The senior unsecured notes are part of the same series of WMECO’s existing 3.5 percent coupon Series F Notes that were initially issued in September 2011. As a result, the aggregate principal amount of WMECO’s outstanding Series F Notes totaled $250 million. On October 15, 2012, NSTAR Electric issued at a discount $400 million of 2.375 percent Debentures at a yield of 2.406 percent that will mature on October 15, 2022. The proceeds were used to pay $400 million of 4.875 percent Debentures that matured on October 15, 2012. On October 4, 2012, WMECO issued at a premium $150 million of senior unsecured notes at a yield of 2.673 percent that will mature on September 15, 2021. The senior unsecured notes are part of the same series of WMECO’s existing 3.5 percent coupon Series F Notes that were initially issued in September 2011. As a result, the aggregate principal amount of WMECO’s outstanding Series F Notes totaled $250 million.
	us-gaap	Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year Description DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearDescription	Contributions: NU’s policy is to annually fund the Pension Plans in an amount at least equal to an amount that will satisfy the requirements of ERISA, as amended by the PPA of 2006, and the Internal Revenue Code. Based on the current status of the NUSCO Pension Plan, NU is required to make a contribution to the NUSCO Pension Plan of $197.3 million in 2012 to meet minimum funding requirements under the PPA. Contributions are being made in installments and began in January 2012. NU made contributions totaling $35.2 million and $162.3 million ($87.7 million of which was contributed by PSNH in the first quarter of 2012) for the three and nine months ended September 30, 2012, respectively. NSTAR Electric made contributions to the NSTAR Electric Pension Plan of $18.7 million and $25 million for the three and nine months ended September 30, 2012. NSTAR Electric does not anticipate additional contributions to the pension plan for the remainder of 2012. The actual level of funding may differ from this estimate.
	us-gaap	Defined Benefit Plan Description Of Settlements And Curtailments DefinedBenefitPlanDescriptionOfSettlementsAndCurtailments	Curtailment Expense (SERP): NU recorded curtailment expense of $1.8 million for the NUSCO SERP for the nine months ended September 30, 2012 to reflect charges related to organization changes that occurred as a result of the merger.
	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	1800000	USD
CY2012Q2	nu	Share Based Compensation Arrangement By Share Based Payment Award Options Converted Nstar Options Upon Merger ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConvertedNstarOptionsUponMerger	2664894	shares
CY2012Q2	nu	Share Based Compensation Arrangement By Share Based Payment Award Options Converted Nstar Options Upon Merger Total Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConvertedNstarOptionsUponMergerTotalValue	30.5	USD
CY2012Q2	nu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nstar Deferred And Performance Awards Converted Upon Merger ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNstarDeferredAndPerformanceAwardsConvertedUponMerger	421775	shares
CY2012Q2	nu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nstar Deferred And Performance Awards Converted To Nu Rsus Upon Merger Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNstarDeferredAndPerformanceAwardsConvertedToNuRsusUponMergerValue	15.5	USD
CY2012Q2	nu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nstar Rsu Retention Awards Converted To Nu Rsus Upon Merger ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNstarRsuRetentionAwardsConvertedToNuRsusUponMerger	195619	shares
CY2012Q2	nu	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nstar Rsu Retention Awards Converted To Nu Rsu Retention Awards Upon Merger Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNstarRsuRetentionAwardsConvertedToNuRsuRetentionAwardsUponMergerValue	7.2	USD
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	-405551	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	0	shares
CY2012Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2306717	shares
CY2011	nu	Espp Discounted Purchase Price Second Six Months EsppDiscountedPurchasePriceSecondSixMonths	32.30	USD
CY2012Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	4500000	shares
CY2012Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2501295	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2685615	shares
CY2012Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	4.8	USD
CY2011Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	3.2	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	21.6	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	9.3	USD
CY2012Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1.9	USD
CY2011Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1.3	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8.7	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3.7	USD
CY2012Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	30.3	USD
	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition	2.08	pure
CY2012Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1	4.4	pure
	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	3.9	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	1.4	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	47374	shares
CY2011	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit	18.58
CY2011	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit	18.90
	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit	18.45
	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit	28.12
	nu	Share Base Compensation Converted Nstar Options Exercise Price Range Lower Range Limit ShareBaseCompensationConvertedNstarOptionsExercisePriceRangeLowerRangeLimit	0
	nu	Share Base Compensation Converted Nstar Options Exercise Price Range Upper Range Limit ShareBaseCompensationConvertedNstarOptionsExercisePriceRangeUpperRangeLimit	0
CY2012Q2	nu	Share Based Compensation Arrangement By Share Based Payment Award Options Converted Nstar Options Upon Merger Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConvertedNstarOptionsUponMergerWeightedAverageExercisePrice	23.99
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	18.78
CY2012Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	23.92
CY2012Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	23.74
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	5.3	USD
CY2012Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	34.0	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Grant Date Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue	34100000	USD
CY2011	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	35476	shares
	nu	Espp Discounted Purchase Price First Six Months EsppDiscountedPurchasePriceFirstSixMonths	33.01	USD
	nu	Espp Discounted Purchase Price First Six Months EsppDiscountedPurchasePriceFirstSixMonths	31.27	USD
CY2012Q3	nu	Employee Stock Purchase Plan Shares Remaining For Future Issuance EmployeeStockPurchasePlanSharesRemainingForFutureIssuance	857280	shares
CY2011Q4	nu	Employee Stock Purchase Plan Shares Remaining For Future Issuance EmployeeStockPurchasePlanSharesRemainingForFutureIssuance	896702	shares
	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	2.1	USD
	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	9.6	USD
	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	39422	shares
	nu	Espp Discounted Purchase Price Second Six Months EsppDiscountedPurchasePriceSecondSixMonths	37.89	USD
CY2012Q3	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	38600000	USD
CY2011	nu	Environmental Site Quantity EnvironmentalSiteQuantity	59	pure
CY2011Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	31700000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	12200000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	48300000	USD
	nu	Environmental Site Quantity EnvironmentalSiteQuantity	83	pure
	nu	Cumulative Payments Environmental Loss Contingencies CumulativePaymentsEnvironmentalLossContingencies	17400000	USD
	nu	Cumulative Environmental Remediation Expense CumulativeEnvironmentalRemediationExpense	19.5	USD
CY2012Q3	us-gaap	Site Contingency Accrual Undiscounted Amount SiteContingencyAccrualUndiscountedAmount	2100000	USD
CY2012Q3	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	84300000	USD
CY2012Q3	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	188600000	USD
CY2012Q3	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	182500000	USD
CY2012Q3	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	159700000	USD
CY2012Q3	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	95300000	USD
CY2012Q3	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	391700000	USD
	us-gaap	Unrecorded Unconditional Purchase Obligation Purchases UnrecordedUnconditionalPurchaseObligationPurchases	1102100000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	3200000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	11500000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	8400000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	7300000	USD
CY2012Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	5700000	USD
CY2012Q3	nu	Court Of Federal Claims Ruling To Cyapc CourtOfFederalClaimsRulingToCyapc	34200000	USD
CY2012Q3	nu	Court Of Federal Claims Ruling To Yaec CourtOfFederalClaimsRulingToYaec	32900000	USD
CY2012Q3	nu	Court Of Federal Claims Ruling Myapc CourtOfFederalClaimsRulingMyapc	75800000	USD
CY2012Q3	nu	Trial Court Ruling To Cyapc TrialCourtRulingToCyapc	39700000	USD
CY2012Q3	nu	Trial Court Ruling To Yaec TrialCourtRulingToYaec	21200000	USD
CY2012Q3	nu	Trial Court Ruling To Myapc TrialCourtRulingToMyapc	81700000	USD
CY2012Q3	nu	Court Of Federal Appeals Ruling Increase To Yaec Damages CourtOfFederalAppealsRulingIncreaseToYaecDamages	17000000	USD
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	5688	shares
CY2012Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	999355	shares
CY2012Q3	nu	Cumulative Costs Associated With Cpsl Program At Nstar Electric CumulativeCostsAssociatedWithCpslProgramAtNstarElectric	95000000	USD
CY2012Q3	nu	Cpsl Annual Revenue Per Annum From Comprehensive Settlement Agreement CpslAnnualRevenuePerAnnumFromComprehensiveSettlementAgreement	15000000	USD
CY2012Q3	nu	Deferred Costs Associated With Bad Debt Adder At Nstar Electric DeferredCostsAssociatedWithBadDebtAdderAtNstarElectric	34000000	USD
CY2012Q3	nu	Before Tax Reserve For Bad Debt Service Adder BeforeTaxReserveForBadDebtServiceAdder	28000000	USD
CY2012Q3	nu	After Tax Bad Debt Service Adder Reserve AfterTaxBadDebtServiceAdderReserve	17000000	USD
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2012Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	380000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	196052770	shares
CY2012Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	332471514	shares
CY2012Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	380000000	shares
CY2012Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	18568240	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	18894078	shares
	nu	Contributions To Northern Pass Trans ContributionsToNorthernPassTrans	900000	USD
CY2011Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	337486	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	716741	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	303213	shares
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.66
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.51
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.33
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.59
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.32
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.58
CY2012Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	231300000	USD
CY2012Q3	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	1217300000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	546800000	USD
	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	3256200000	USD
CY2011Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	129000000	USD
CY2011Q3	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	782100000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	361400000	USD
	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	2426900000	USD
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
	dei	Entity Registrant Name EntityRegistrantName	NORTHEAST UTILITIES
	dei	Document Type DocumentType	10-Q
	dei	Document Period End Date DocumentPeriodEndDate	2012-09-30
	dei	Entity Central Index Key EntityCentralIndexKey	0000072741
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	313943203	shares
CY2012Q3	dei	Entity Public Float EntityPublicFloat	12000522165	USD
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer

Files In Submission

Name	View Source	Status
0000072741-12-000080-index-headers.html	Edgar Link	pending
0000072741-12-000080-index.html	Edgar Link	pending
0000072741-12-000080.txt	Edgar Link	pending
0000072741-12-000080-xbrl.zip	Edgar Link	pending
exh12clp.htm	Edgar Link	pending
exh12nstarelectric.htm	Edgar Link	pending
exh12nu.htm	Edgar Link	pending
exh12psnh.htm	Edgar Link	pending
exh12wmeco.htm	Edgar Link	pending
exh311nu.htm	Edgar Link	pending
exh31nu.htm	Edgar Link	pending
exh32nu.htm	Edgar Link	pending
exhibit311clp.htm	Edgar Link	pending
exhibit311nstarelectric.htm	Edgar Link	pending
exhibit311psnh.htm	Edgar Link	pending
exhibit311wmeco.htm	Edgar Link	pending
exhibit31clp.htm	Edgar Link	pending
exhibit31nstarelectric.htm	Edgar Link	pending
exhibit31psnh.htm	Edgar Link	pending
exhibit31wmeco.htm	Edgar Link	pending
exhibit32clp.htm	Edgar Link	pending
exhibit32nstarelectric.htm	Edgar Link	pending
exhibit32psnh.htm	Edgar Link	pending
exhibit32wmeco.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
formdealeragreement.htm	Edgar Link	pending
nstarcreditagreement2012.htm	Edgar Link	pending
nu-20120930.xml	Edgar Link	completed
nu-20120930.xsd	Edgar Link	pending
nu-20120930_cal.xml	Edgar Link	unprocessable
nu-20120930_def.xml	Edgar Link	unprocessable
nu-20120930_lab.xml	Edgar Link	unprocessable
nu-20120930_pre.xml	Edgar Link	unprocessable
nucreditagreement2012.htm	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
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R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
september302012form10qedg002.gif	Edgar Link	pending
september302012form10qedgar.htm	Edgar Link	pending
Show.js	Edgar Link	pending

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$ES
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2012 Q4 Form 10-Q Financial Statement

#000007274112000080 Filed on November 07, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ES EVERSOURCE ENERGY Stock $es

2012 Q4 Form 10-Q Financial Statement

#000007274112000080 Filed on November 07, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ES
EVERSOURCE ENERGY Stock $es