$ES
EVERSOURCE ENERGY Stock $es

$es Overview Financials Valuation SEC Filings Company Website

2013 Q1 Form 10-Q Financial Statement

#000007274113000030 Filed on May 06, 2013

Income Statement

Concept	2013 Q1	2012 Q1
Revenue	$1.995B	$1.100B
YoY Change	81.43%	-10.99%
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	$243.5M	$104.6M
YoY Change	132.79%	-16.72%
% of Gross Profit
Operating Expenses	$1.576B	$885.2M
YoY Change	78.04%	-12.17%
Operating Profit	$418.9M	$214.4M
YoY Change	95.38%	-5.72%
Interest Expense	$76.26M	$66.45M
YoY Change	14.76%	13.49%
% of Operating Profit	18.2%	30.99%
Other Income/Expense, Net	$7.765M	$8.773M
YoY Change	-11.49%	-14.93%
Pretax Income	$350.5M	$156.7M
YoY Change	123.62%	-12.51%
Income Tax	$120.5M	$55.96M
% Of Pretax Income	34.38%	35.71%
Net Earnings	$230.0M	$100.8M
YoY Change	128.17%	-12.8%
Net Earnings / Revenue	11.53%	9.17%
Basic Earnings Per Share	$0.72
Diluted Earnings Per Share	$0.72	$565.0K
COMMON SHARES
Basic Shares Outstanding	315.1M shares	178.1M shares
Diluted Shares Outstanding	316.0M shares	178.4M shares

Balance Sheet

Concept	2013 Q1	2012 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$160.0M	$346.0M
YoY Change	-53.76%	264.21%
Cash & Equivalents	$61.00M	$283.0M
Short-Term Investments	$99.00M	$63.00M
Other Short-Term Assets	$925.0M	$94.74M
YoY Change	876.39%	-80.39%
Inventory	$239.0M	$219.0M
Prepaid Expenses
Receivables	$833.0M	$485.8M
Other Receivables	$0.00	$0.00
Total Short-Term Assets	$2.158B	$1.523B
YoY Change	41.65%	8.28%
LONG-TERM ASSETS
Property, Plant & Equipment	$16.74B	$10.61B
YoY Change	57.71%	9.23%
Goodwill		$287.6M
YoY Change
Intangibles
YoY Change
Long-Term Investments	$492.0M	$74.00M
YoY Change	564.86%	39.62%
Other Assets	$5.422B	$171.6M
YoY Change	3060.01%	-94.19%
Total Long-Term Assets	$26.17B	$3.842B
YoY Change	581.24%	-70.47%
TOTAL ASSETS
Total Short-Term Assets	$2.158B	$1.523B
Total Long-Term Assets	$26.17B	$3.842B
Total Assets	$28.33B	$15.98B
YoY Change	77.3%	10.82%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$633.0M	$412.9M
YoY Change	53.31%	-3.76%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$1.287B	$660.0M
YoY Change	95.0%	249.21%
Long-Term Debt Due	$947.0M	$267.3M
YoY Change	254.3%	304.98%
Total Short-Term Liabilities	$3.840B	$1.968B
YoY Change	95.15%	63.02%
LONG-TERM LIABILITIES
Long-Term Debt	$7.031B	$4.977B
YoY Change	41.27%	3.8%
Other Long-Term Liabilities	$4.343B	$414.0M
YoY Change	949.02%	-84.69%
Total Long-Term Liabilities	$11.37B	$4.751B
YoY Change	139.39%	-36.64%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.840B	$1.968B
Total Long-Term Liabilities	$11.37B	$4.751B
Total Liabilities	$18.83B	$6.719B
YoY Change	180.22%	-35.5%
SHAREHOLDERS EQUITY
Retained Earnings		$1.699B
YoY Change
Common Stock		$981.6M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)		-$344.8M
YoY Change
Treasury Stock Shares	18.36M shares	18.79M shares
Shareholders Equity	$9.501B	$4.068B
YoY Change
Total Liabilities & Shareholders Equity	$28.33B	$15.98B
YoY Change	77.29%	10.81%

Cashflow Statement

Concept	2013 Q1	2012 Q1
OPERATING ACTIVITIES
Net Income	$230.0M	$100.8M
YoY Change	128.17%	-12.8%
Depreciation, Depletion And Amortization	$243.5M	$104.6M
YoY Change	132.79%	-16.72%
Cash From Operating Activities	$473.1M	$8.816M
YoY Change	5266.87%	-97.63%
INVESTING ACTIVITIES
Capital Expenditures	$389.0M	$304.3M
YoY Change	27.82%	28.56%
Acquisitions
YoY Change
Other Investing Activities	-$28.00M	-$2.448M
YoY Change	1043.67%	646.34%
Cash From Investing Activities	-$446.9M	-$302.5M
YoY Change	47.75%	27.65%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net	$0.00
YoY Change
Cash From Financing Activities	-$11.16M	$570.5M
YoY Change	-101.96%	-496.56%
NET CHANGE
Cash From Operating Activities	$473.1M	$8.816M
Cash From Investing Activities	-$446.9M	-$302.5M
Cash From Financing Activities	-$11.16M	$570.5M
Net Change In Cash	$15.07M	$276.8M
YoY Change	-94.56%	-3544.75%
FREE CASH FLOW
Cash From Operating Activities	$473.1M	$8.816M
Capital Expenditures	$389.0M	$304.3M
Free Cash Flow	$84.19M	-$295.5M
YoY Change	-128.49%	-317.14%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2013Q1	us-gaap	Revenues Revenues	1995023000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	156719000	USD
CY2013Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	120487000	USD
CY2012Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	55964000	USD
CY2013Q1	us-gaap	Net Income Loss NetIncomeLoss	229968000	USD
CY2012Q1	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	1431000	USD
CY2013Q1	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	747809000	USD
CY2012Q1	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	395344000	USD
CY2012Q1	us-gaap	Depreciation Depreciation	80839000	USD
CY2013Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	418945000	USD
CY2013Q1	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	85295000	USD
CY2012Q1	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	59968000	USD
CY2013Q1	us-gaap	Interest Expense Other Long Term Debt InterestExpenseOtherLongTermDebt	611000	USD
CY2013Q1	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	16512360000	USD
CY2012Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	16592774000	USD
CY2013Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	28328661000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	28302824000	USD
CY2013Q1	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	191707000	USD
CY2012Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	134115000	USD
CY2012Q1	us-gaap	Revenues Revenues	1099623000	USD
CY2013Q1	us-gaap	Interest Expense Other InterestExpenseOther	-9651000	USD
CY2012Q1	us-gaap	Interest Expense Other InterestExpenseOther	5048000	USD
CY2013Q1	us-gaap	Interest Expense InterestExpense	76255000	USD
CY2012Q1	us-gaap	Interest Expense InterestExpense	66447000	USD
CY2013Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	350455000	USD
CY2012Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1493000	USD
CY2013Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	316002538	shares
CY2012Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	178437453	shares
CY2013Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	315129782	shares
CY2012Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	178055716	shares
CY2013Q1	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	346092000	USD
CY2013Q1	nu	Energy Efficiency Programs EnergyEfficiencyPrograms	105771000	USD
CY2012Q1	nu	Energy Efficiency Programs EnergyEfficiencyPrograms	37273000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	516000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	423000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-181000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	34000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1621000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1407000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1956000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1864000	USD
CY2013Q1	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1879000	USD
CY2012Q1	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1493000	USD
CY2013Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	230045000	USD
CY2012Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	101126000	USD
CY2013Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.37
CY2012Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.29
CY2013Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	168938000	USD
CY2013Q1	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	53102000	USD
CY2013Q1	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-39218000	USD
CY2013Q1	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-51106000	USD
CY2013Q1	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	129431000	USD
CY2013Q1	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-28487000	USD
CY2013Q1	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	21295000	USD
CY2013Q1	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-86916000	USD
CY2013Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	32235000	USD
CY2013Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	473143000	USD
CY2013Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	388950000	USD
CY2013Q1	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	98070000	USD
CY2013Q1	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	184030000	USD
CY2013Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-27997000	USD
CY2013Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-446913000	USD
CY2013Q1	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	62529000	USD
CY2013Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2322000	USD
CY2013Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-11161000	USD
CY2013Q1	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	15069000	USD
CY2012Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	52474000	USD
CY2012Q1	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	42268000	USD
CY2012Q1	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	27569000	USD
CY2012Q1	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-5484000	USD
CY2012Q1	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-29276000	USD
CY2012Q1	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-30108000	USD
CY2012Q1	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-11758000	USD
CY2012Q1	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-190232000	USD
CY2012Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	40240000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	8816000	USD
CY2012Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	304294000	USD
CY2012Q1	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	40947000	USD
CY2012Q1	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	41570000	USD
CY2012Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-2448000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-302469000	USD
CY2012Q1	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	17903000	USD
CY2012Q1	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1130000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	570473000	USD
CY2012Q1	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	276820000	USD
CY2013Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	116431000	USD
CY2013Q1	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	1879000	USD
CY2013Q1	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-228000000	USD
CY2013Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	400000000	USD
CY2012Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	52104000	USD
CY2012Q1	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	1390000	USD
CY2012Q1	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	343000000	USD
CY2012Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	300000000	USD
CY2013Q1	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	47048000	USD
CY2012Q1	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	98910000	USD
CY2013Q1	nu	Proceeds From Doe Damages Claim ProceedsFromDoeDamagesClaim	77936000	USD
CY2011Q4	us-gaap	Cash Cash	6559000	USD
CY2012Q1	us-gaap	Cash Cash	283379000	USD
CY2012Q1	us-gaap	Immaterial Error Correction ImmaterialErrorCorrection	The NSTAR Electric consolidated statement of cash flows was revised to correct an error in the presentation of cash deposits related to the RRBs. The impact of this revision was an increase in investing cash inflows from Other Investing Activities in an amount of $24.8 million and a corresponding increase to financing cash outflows from Retirements of Rate Reduction Bonds for the three months ended March 31, 2012. This revision had no impact on NSTAR Electric’s results of operations or cash balance and is not deemed material, individually or in the aggregate, to the previously issued consolidated financial statements.
CY2013Q1	nu	Description Of Consolidation Of Yankee Companies DescriptionOfConsolidationOfYankeeCompanies	NU consolidates CYAPC and YAEC as CL&P’s, NSTAR Electric’s, PSNH’s and WMECO’s combined ownership interest in each of these entities is greater than 50 percent. Intercompany transactions between CL&P, NSTAR Electric, PSNH and WMECO and the CYAPC and YAEC companies 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.
CY2012Q1	nu	Reclassification Of Transmission Expense ReclassificationOfTransmissionExpense	-2700000	USD
CY2012Q1	nu	Reclassification Of Energy Expense ReclassificationOfEnergyExpense	37300000	USD
CY2012Q1	nu	Description Of Change In Estimate DescriptionOfChangeInEstimate	Effective January 1, 2012, NSTAR Electric changed its estimates with respect to the allowance for doubtful accounts, incurred but not reported claims on medical benefits, general and workers' compensation liabilities and compensation accruals. The total aggregate impact of these changes in estimates on NSTAR Electric's accompanying consolidated statement of income was a decrease to net income of $11.4 million, after-tax, for the three months ended March 31, 2012.
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	165500000	USD
CY2013Q1	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	178600000	USD
CY2013Q1	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	3800000	USD
CY2013Q1	nu	Cash Collateral Deposited CashCollateralDeposited	12800000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	3300000	USD
CY2012Q4	nu	Cash Collateral Deposited CashCollateralDeposited	14600000	USD
CY2013Q1	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	38400000	USD
CY2012Q1	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	35000000	USD
CY2012Q1	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	138500000	USD
CY2013Q1	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	98700000	USD
CY2013Q1	us-gaap	Regulatory Assets RegulatoryAssets	5640600000	USD
CY2012Q4	us-gaap	Regulatory Assets RegulatoryAssets	5837400000	USD
CY2013Q1	us-gaap	Description Of Regulatory Costs Not Yet Approved DescriptionOfRegulatoryCostsNotYetApproved	Regulatory Costs Not Yet Approved: The Regulated companies had $78.8 million ($3.7 million for CL&P, $26.3 million for NSTAR Electric, $37.2 million for PSNH, and $6 million for WMECO) and $69.9 million ($3.9 million for CL&P, $25.4 million for NSTAR Electric, $35.7 million for PSNH, and $1.4 million for WMECO) of regulatory costs as of March 31, 2013 and December 31, 2012, respectively, which were included in Other Long-Term Assets on the consolidated balance sheets. 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 ultimately be approved and recovered from customers.
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	20829400000	USD
CY2012Q4	nu	Electric And Natural Gas Utility Accumulated Depreciation ElectricAndNaturalGasUtilityAccumulatedDepreciation	5065100000	USD
CY2013Q1	nu	Major Storm Costs Incurred MajorStormCostsIncurred	Storm Restoration Costs: The storm restoration cost deferrals relate to costs incurred at CL&P, NSTAR Electric, PSNH and WMECO that each company expects to collect from customers. A storm must meet certain criteria specific to each state and utility company to be declared a major storm. Once a storm is declared major, all qualifying expenses incurred during storm restoration efforts, if deemed prudent, are deferred and recovered from customers in future periods. In Connecticut, qualifying storm restoration costs must exceed $5 million for a storm to be declared a major storm. In Massachusetts, qualifying storm restoration costs must exceed $1 million for NSTAR Electric and $300,000 for WMECO and an emergency response plan must be initiated for a storm to be declared a major storm. In New Hampshire, (1) at least 10 percent of customers must be without power with at least 200 concurrent locations requiring repairs (trouble spots), or (2) at least 300 concurrent trouble spots must be reported for a storm to be declared a major storm. In addition, PSNH is permitted to defer pre-staging costs for storms that may not ultimately qualify as a major storm. On February 8, 2013, a blizzard caused damage to the electric delivery systems of CL&P and NSTAR Electric. This blizzard resulted in estimated deferred storm restoration costs of approximately $13 million at CL&P and approximately $80 million at NSTAR Electric. On January 31, 2013, a major storm caused damage to CL&P's electric delivery system, which resulted in estimated deferred storm restoration costs of approximately $19 million. Management believes these storm restoration costs meet the criteria for specific cost recovery in Connecticut and Massachusetts and, as a result, are probable of recovery. Therefore, management does not expect these storms to have a material impact on CL&P's or NSTAR Electric’s results of operations. CL&P and NSTAR Electric will seek recovery of these deferred storm restoration costs through their applicable regulatory recovery process.
CY2013Q1	us-gaap	Regulatory Liabilities RegulatoryLiabilities	723200000	USD
CY2012Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	674300000	USD
CY2013Q1	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	11504000000	USD
CY2013Q1	nu	Public Utilities Property Plant And Equipment Distribution Natural Gas PublicUtilitiesPropertyPlantAndEquipmentDistributionNaturalGas	2290800000	USD
CY2013Q1	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	5721200000	USD
CY2013Q1	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	1146700000	USD
CY2013Q1	nu	Public Utilities Property Plant And Equipment Electric And Natural Gas Utility Total PublicUtilitiesPropertyPlantAndEquipmentElectricAndNaturalGasUtilityTotal	20662700000	USD
CY2013Q1	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	503000000	USD
CY2013Q1	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	21165700000	USD
CY2013Q1	nu	Electric And Natural Gas Utility Accumulated Depreciation ElectricAndNaturalGasUtilityAccumulatedDepreciation	5157700000	USD
CY2013Q1	nu	Other Accumulated Depreciation OtherAccumulatedDepreciation	178500000	USD
CY2013Q1	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	5336200000	USD
CY2013Q1	nu	Property Plant And Equipment Net Excluding Construction Work In Progress PropertyPlantAndEquipmentNetExcludingConstructionWorkInProgress	15829500000	USD
CY2013Q1	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	908000000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	11438200000	USD
CY2012Q4	nu	Public Utilities Property Plant And Equipment Distribution Natural Gas PublicUtilitiesPropertyPlantAndEquipmentDistributionNaturalGas	2274200000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	5541100000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	1146600000	USD
CY2012Q4	nu	Public Utilities Property Plant And Equipment Electric And Natural Gas Utility Total PublicUtilitiesPropertyPlantAndEquipmentElectricAndNaturalGasUtilityTotal	20400100000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	429300000	USD
CY2012Q4	nu	Other Accumulated Depreciation OtherAccumulatedDepreciation	171500000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	5236600000	USD
CY2012Q4	nu	Property Plant And Equipment Net Excluding Construction Work In Progress PropertyPlantAndEquipmentNetExcludingConstructionWorkInProgress	15592800000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	1012200000	USD
CY2013Q1	nu	Current Derivative Assets Consolidated CurrentDerivativeAssetsConsolidated	10500000	USD
CY2012Q4	nu	Current Derivative Assets Consolidated CurrentDerivativeAssetsConsolidated	11400000	USD
CY2013Q1	us-gaap	Description Of Derivative Activity Volume DescriptionOfDerivativeActivityVolume	As of March 31, 2013 and December 31, 2012, NU had approximately 5 thousand MWh and 24 thousand MWh, respectively, of supply volumes remaining in its unregulated wholesale portfolio when expected sales are compared with supply contracts.
CY2013Q1	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	3500000	USD
CY2012Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	4100000	USD
CY2012Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Liability Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3	32200000	USD
CY2012Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	8000000	USD
CY2012Q1	nu	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Reg Asset Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInRegAssetLiability	6000000	USD
CY2012Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	14500000	USD
CY2012Q1	nu	Interest Realized In Earnings On Fair Value Hedge InterestRealizedInEarningsOnFairValueHedge	2500000	USD
CY2012Q1	us-gaap	Notional Amount Of Fair Value Hedge Instruments NotionalAmountOfFairValueHedgeInstruments	263000000	USD
CY2013Q1	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	9400000	USD
CY2013Q1	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	8400000	USD
CY2012Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	15300000	USD
CY2012Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2012Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	17400000	USD
CY2012Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	878600000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	962200000	USD
CY2012Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	901500000	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings	5700000	USD
CY2013Q1	nu	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Reg Asset Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossIncludedInRegAssetLiability	26200000	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	13600000	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	833100000	USD
CY2012Q4	nu	Fair Value Of Securities Under Fair Value Option FairValueOfSecuritiesUnderFairValueOption	47000000	USD
CY2013Q1	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	4200000	USD
CY2012	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	3200000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	62200000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	51200000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	91200000	USD
CY2013Q1	nu	Fair Value Of Securities Under Fair Value Option FairValueOfSecuritiesUnderFairValueOption	51200000	USD
CY2013Q1	us-gaap	Marketable Securities Restricted Noncurrent MarketableSecuritiesRestrictedNoncurrent	434900000	USD
CY2012Q4	us-gaap	Marketable Securities Restricted Noncurrent MarketableSecuritiesRestrictedNoncurrent	340400000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	150700000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost	355300000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	150800000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	63500000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	53400000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	97500000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	365200000	USD
CY2013Q1	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	591100000	USD
CY2012Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	492300000	USD
CY2013Q1	us-gaap	Significant Change In Unrecognized Tax Benefits Nature Of Event SignificantChangeInUnrecognizedTaxBenefitsNatureOfEvent	NU currently has open tax years. It is reasonably possible that at least one of these open tax years could be resolved within the next twelve months. Management estimates that the potential resolutions could result in a $1 million to $2 million decrease, net of any related valuation allowance, in unrecognized tax benefits for NU.
CY2013Q1	nu	Description Of Commercial Paper Program DescriptionOfCommercialPaperProgram	As of March 31, 2013 and December 31, 2012, NU had $979 million and $1.15 billion, respectively, in short-term borrowings outstanding under its commercial paper program, leaving $171 million of available borrowing capacity as of March 31, 2013. The weighted-average interest rate on these borrowings as of March 31, 2013 and December 31, 2012 was 0.35 percent and 0.46 percent, respectively, which is generally based on money market rates. As of March 31, 2013, there were inter-company loans of $832 million from NU to its subsidiaries ($210.4 million at CL&P, $53.4 million at PSNH and $43.4 million at WMECO). As of December 31, 2012, there were inter-company loans of $987.5 million from NU to its subsidiaries ($405.1 million at CL&P, $63.3 million at PSNH, and $31.9 million at WMECO). As of March 31, 2013 and December 31, 2012, NSTAR Electric had $308 million and $276 million, respectively, in short-term borrowings outstanding under its commercial paper program, leaving $142 million and $174 million, respectively, of available borrowing capacity. The weighted-average interest rate on these borrowings as of March 31, 2013 and December 31, 2012 was 0.28 percent and 0.31 percent, respectively, which is generally based on money market rates. Amounts outstanding under the commercial paper program are included in Notes Payable for NU and NSTAR Electric and classified in current liabilities on the consolidated balance sheets as management anticipates that all borrowings under these credit facilities will be outstanding for no more than 364 days at one time. Intercompany loans from NU to CL&P, PSNH and WMECO are included in Notes Payable to Affiliated Companies and classified in current liabilities on the consolidated balance sheets.
CY2013Q1	nu	Short Term Debt Regulatory Limits ShortTermDebtRegulatoryLimits	:  The amount of short-term borrowings that may be incurred by CL&P, NSTAR Electric and WMECO is subject to periodic approval by the FERC. On November 30, 2011, the FERC granted authorization to allow CL&P and WMECO to incur total short-term borrowings up to a maximum of $450 million and $300 million, respectively, effective January 1, 2012 through December 31, 2013. On March 22, 2012, the FERC approved CL&P's application requesting to increase its total short-term borrowing capacity from a maximum of $450 million to a maximum of $600 million for the authorization period through December 31, 2013. On May 16, 2012, the FERC granted authorization to allow NSTAR Electric to issue total short-term debt securities in an aggregate principal amount not to exceed $655 million outstanding at any one time, effective October 23, 2012 through October 23, 2014. As a result of the NHPUC having jurisdiction over PSNH's short-term debt, PSNH is not currently required to obtain FERC approval for its short-term borrowings.
CY2013Q1	nu	Description Of Working Capital DescriptionOfWorkingCapital	Working Capital: NU, CL&P, NSTAR Electric, PSNH and WMECO use their available capital resources to fund their respective construction expenditures, meet debt requirements, pay costs, including storm-related costs, pay dividends and 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 natural 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, $231 million, $226 million, $34 million and $48 million at NU, CL&P, NSTAR Electric, PSNH and WMECO, respectively, as of March 31, 2013. As of March 31, 2013, $947.3 million of NU's current liabilities relates to long-term debt that will be paid in the next 12 months, consisting of $550 million for NU parent, $125 million for CL&P, $109 million for PSNH, $75 million for Yankee Gas and $55 million for WMECO. Approximately $32 million relates to the amortization of the purchase accounting fair value adjustment that will be amortized in the next twelve months. NU, with its strong credit ratings, 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, PSNH 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, CL&P, NSTAR Electric, PSNH and WMECO along with the access to financial markets, will be sufficient to meet any future operating requirements and capital investment forecasted opportunities.
CY2013Q1	nu	Description Of Lt Debt Reclassified To St DescriptionOfLtDebtReclassifiedToSt	On May 1, 2013, PSNH redeemed at par approximately $109 million of the 2001 Series C PCRBs that were due to mature in 2021 with short-term debt. As a result, the PCRBs were recorded as Long-Term Debt - Current Portion.
CY2013Q1	us-gaap	Income Tax Examination Description IncomeTaxExaminationDescription	Tax Positions: In March 2013, NU received a Final Determination from the Connecticut Department of Revenue Services (DRS) Appellate Division that concluded its audit of NU's Connecticut income tax returns for the years 2005 through 2008, bringing closure to, and effective settlement of, issues concerning the deductibility of expenses and credits through 2008. The DRS Determination resulted in total NU and CL&P after-tax benefits of $13.6 million and $6.9 million, respectively, recorded in the first quarter of 2013 that included a reduction in NU and CL&P pre-tax interest expense of $8.7 million and $4 million, or $5.2 million and $2.4 million after-tax, respectively. Further, the income tax expense impact resulted in a tax benefit to NU and CL&P of $8.4 million and $4.5 million after-tax, respectively. Management estimates that resolution of this audit decreases NU's and CL&P's unrecognized tax benefits by approximately $49.8 million and $39.4 million, respectively, that was largely offset by NU's and CL&P's valuation allowance and other tax impacts of $44.9 million and $36.5 million, respectively.
CY2013Q1	nu	Environmental Site Quantity EnvironmentalSiteQuantity	72	pure
CY2012	nu	Environmental Site Quantity EnvironmentalSiteQuantity	77	pure
CY2013Q1	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	40700000	USD
CY2012Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	39400000	USD
CY2013Q1	us-gaap	Accrual For Environmental Loss Contingencies Component Amount AccrualForEnvironmentalLossContingenciesComponentAmount	2000000	USD
CY2013Q1	nu	Cumulative Environmental Remediation Expense CumulativeEnvironmentalRemediationExpense	19500000	USD
CY2013Q1	nu	Cumulative Payments Environmental Loss Contingencies CumulativePaymentsEnvironmentalLossContingencies	17500000	USD
CY2013Q1	nu	Trial Court Ruling To Cyapc TrialCourtRulingToCyapc	39700000	USD
CY2013Q1	nu	Trial Court Ruling To Yaec TrialCourtRulingToYaec	38200000	USD
CY2013Q1	nu	Trial Court Ruling To Myapc TrialCourtRulingToMyapc	81700000	USD
CY2013Q1	nu	Connecticut Yankee Proceeds Received ConnecticutYankeeProceedsReceived	39700000	USD
CY2013Q1	nu	Yankee Atomic Proceeds Received YankeeAtomicProceedsReceived	38200000	USD
CY2013Q1	nu	Maine Yankee Proceeds Received MaineYankeeProceedsReceived	81700000	USD
CY2013Q1	nu	Increase In Marketable Securities Current Period IncreaseInMarketableSecuritiesCurrentPeriod	77900000	USD
CY2013Q1	nu	Cumulative Cpsl Costs2006 To2011 CumulativeCpslCosts2006To2011	83000000	USD
CY2013Q1	nu	Bad Debt Service Adder As Of2011 BadDebtServiceAdderAsOf2011	34000000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	500000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-16400000	USD
CY2013Q1	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-15900000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1300000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	100000	USD
CY2013Q1	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1200000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	57800000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	1600000	USD
CY2013Q1	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	56200000	USD
CY2013Q1	nu	Othercomprehensiveincomebeforereclassifications Othercomprehensiveincomebeforereclassifications	-100000	USD
CY2013Q1	nu	Amountreclassifiedfromaoci Amountreclassifiedfromaoci	2100000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	-800000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	300000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	-2600000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-2600000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1000000	USD
CY2013Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	332509383	shares
CY2013Q1	us-gaap	Treasury Stock Shares TreasuryStockShares	18356487	shares
CY2013Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	332951956	shares
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	380000000	shares
CY2013Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	380000000	shares
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	18455749	shares
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2013Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	872756	shares
CY2012Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	381737	shares
CY2013Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	6299	shares
CY2012Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2013Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.72
CY2012Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.56
CY2012Q2	us-gaap	Business Acquisition Equity Interests Issued Or Issuable Number Of Shares Issued BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued	136000000	shares
CY2013Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	243500000	USD
CY2013Q1	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	1332500000	USD
CY2012Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	104600000	USD
CY2012Q1	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	780600000	USD
CY2013Q1	dei	Entity Registrant Name EntityRegistrantName	NORTHEAST UTILITIES
CY2013Q1	dei	Document Type DocumentType	10-Q
CY2013Q1	dei	Document Period End Date DocumentPeriodEndDate	2013-03-31
CY2013Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000072741
CY2013Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2013Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	314621345	shares
CY2012Q2	dei	Entity Public Float EntityPublicFloat	12177646948	USD
CY2013Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013Q1	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2013Q1	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2013Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2013Q1	dei	Amendment Flag AmendmentFlag	false

Files In Submission

Name	View Source	Status
0000072741-13-000030-index-headers.html	Edgar Link	pending
0000072741-13-000030-index.html	Edgar Link	pending
0000072741-13-000030.txt	Edgar Link	pending
0000072741-13-000030-xbrl.zip	Edgar Link	pending
clpexhibit31.htm	Edgar Link	pending
clpexhibit311.htm	Edgar Link	pending
clpexhibit32.htm	Edgar Link	pending
edgarmarch2013form10q.htm	Edgar Link	pending
edgarmarch2013form10q002.gif	Edgar Link	pending
exhibit12clp.htm	Edgar Link	pending
exhibit12nstar.htm	Edgar Link	pending
exhibit12nu.htm	Edgar Link	pending
exhibit12psnh.htm	Edgar Link	pending
exhibit12wmeco.htm	Edgar Link	pending
exhibitnu311.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
nstarelectricexhibit31.htm	Edgar Link	pending
nstarelectricexhibit311.htm	Edgar Link	pending
nstarelectricexhibit32.htm	Edgar Link	pending
nu-20130331.xml	Edgar Link	completed
nu-20130331.xsd	Edgar Link	pending
nu-20130331_cal.xml	Edgar Link	unprocessable
nu-20130331_def.xml	Edgar Link	unprocessable
nu-20130331_lab.xml	Edgar Link	unprocessable
nu-20130331_pre.xml	Edgar Link	unprocessable
nuexhibit31.htm	Edgar Link	pending
nuexhibit32.htm	Edgar Link	pending
psnhexhibit31.htm	Edgar Link	pending
psnhexhibit311.htm	Edgar Link	pending
psnhexhibit32.htm	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
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R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
wmecoexhibit31.htm	Edgar Link	pending
wmecoexhibit311.htm	Edgar Link	pending
wmecoexhibit32.htm	Edgar Link	pending

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2013 Q1 Form 10-Q Financial Statement

#000007274113000030 Filed on May 06, 2013

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2013 Q1 Form 10-Q Financial Statement

#000007274113000030 Filed on May 06, 2013

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Cashflow Statement

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