$IDA
IDACORP INC Stock $ida

$ida Overview Financials Valuation SEC Filings Company Website

2010 Q4 Form 10-K Financial Statement

#000105787712000044 Filed on February 22, 2012

Income Statement

Concept	2010 Q4	2009 Q4	2009
Revenue	$232.0M	$253.1M	$1.050B
YoY Change	-8.34%	16.64%	9.31%
Cost Of Revenue	$30.00M	$29.20M	$160.6M
YoY Change	2.74%	-48.04%	-30.51%
Gross Profit	$202.0M	$223.9M	$889.2M
YoY Change	-9.78%	39.24%	21.93%
Gross Profit Margin	87.07%	88.46%	84.7%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$30.50M	$32.10M	$118.6M
YoY Change	-4.98%	23.94%	8.01%
% of Gross Profit	15.1%	14.34%	13.34%
Operating Expenses	$162.9M	$185.0M	$846.2M
YoY Change	-11.95%	34.74%	57.11%
Operating Profit	$39.10M	$38.90M	$203.6M
YoY Change	0.51%	65.53%	6.76%
Interest Expense	-$18.40M	-$21.40M	$72.81M
YoY Change	-14.02%	10.88%	-188.47%
% of Operating Profit	-47.06%	-55.01%	35.76%
Other Income/Expense, Net	$4.100M	$2.600M	$11.93M
YoY Change	57.69%	-143.33%	31.11%
Pretax Income	$24.70M	$20.10M	$146.7M
YoY Change	22.89%	-1216.67%	24.99%
Income Tax	$4.500M	-$3.300M	$22.36M
% Of Pretax Income	18.22%	-16.42%	15.24%
Net Earnings	$20.40M	$23.50M	$124.4M
YoY Change	-13.19%	217.57%	26.37%
Net Earnings / Revenue	8.79%	9.28%	11.85%
Basic Earnings Per Share			$2.64
Diluted Earnings Per Share	$388.6K	$492.7K	$2.64
COMMON SHARES
Basic Shares Outstanding			47.12M shares
Diluted Shares Outstanding			47.18M shares

Balance Sheet

Concept	2010 Q4	2009 Q4	2009
SHORT-TERM ASSETS
Cash & Short-Term Investments	$228.7M	$53.00M	$53.00M
YoY Change	331.51%	502.27%	502.27%
Cash & Equivalents	$228.7M	$52.99M	$53.00M
Short-Term Investments
Other Short-Term Assets	$1.854M	$96.80M	$96.80M
YoY Change	-98.08%	-2.22%	-2.22%
Inventory	$73.10M	$73.70M	$73.70M
Prepaid Expenses	$11.06M
Receivables	$62.11M	$75.00M	$75.00M
Other Receivables	$22.30M	$11.90M	$11.90M
Total Short-Term Assets	$464.0M	$310.4M	$310.4M
YoY Change	49.5%	16.56%	16.56%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.161B	$2.917B	$2.917B
YoY Change	8.38%	5.76%	5.76%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$10.80M	$195.3M	$195.3M
YoY Change	-94.47%	-1.66%	-1.66%
Other Assets	$41.76M	$787.6M	$787.6M
YoY Change	-94.7%	2.37%	2.37%
Total Long-Term Assets	$4.212B	$3.928B	$3.928B
YoY Change	7.22%	4.57%	4.57%
TOTAL ASSETS
Total Short-Term Assets	$464.0M	$310.4M	$310.4M
Total Long-Term Assets	$4.212B	$3.928B	$3.928B
Total Assets	$4.676B	$4.239B	$4.239B
YoY Change	10.32%	5.37%	5.37%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$103.1M	$83.80M	$83.80M
YoY Change	23.03%	-13.43%	-13.43%
Accrued Expenses	$23.90M	$20.10M	$20.10M
YoY Change	18.91%	20.36%	20.36%
Deferred Revenue
YoY Change
Short-Term Debt	$66.90M	$53.80M	$53.80M
YoY Change	24.35%	-64.44%	-64.44%
Long-Term Debt Due	$122.6M	$9.300M	$9.300M
YoY Change	1217.98%	-89.25%	-89.25%
Total Short-Term Liabilities	$449.1M	$218.2M	$218.2M
YoY Change	105.8%	-44.86%	-44.86%
LONG-TERM LIABILITIES
Long-Term Debt	$1.488B	$1.410B	$1.410B
YoY Change	5.57%	19.11%	19.11%
Other Long-Term Liabilities	$74.47M	$634.8M	$634.8M
YoY Change	-88.27%	2.21%	2.21%
Total Long-Term Liabilities	$1.203B	$2.045B	$2.045B
YoY Change	-41.17%	13.29%	13.29%
TOTAL LIABILITIES
Total Short-Term Liabilities	$449.1M	$218.2M	$218.2M
Total Long-Term Liabilities	$1.203B	$2.045B	$2.045B
Total Liabilities	$1.652B	$2.841B	$2.841B
YoY Change	-41.87%	4.45%	4.45%
SHAREHOLDERS EQUITY
Retained Earnings	$709.4M
YoY Change
Common Stock	$807.8M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$40.00K
YoY Change
Treasury Stock Shares	14.30K shares
Shareholders Equity	$1.532B	$1.397B	$1.397B
YoY Change
Total Liabilities & Shareholders Equity	$4.676B	$4.239B	$4.239B
YoY Change	10.32%	5.37%	5.37%

Cashflow Statement

Concept	2010 Q4	2009 Q4	2009
OPERATING ACTIVITIES
Net Income	$20.40M	$23.50M	$124.4M
YoY Change	-13.19%	217.57%	26.37%
Depreciation, Depletion And Amortization	$30.50M	$32.10M	$118.6M
YoY Change	-4.98%	23.94%	8.01%
Cash From Operating Activities	$82.90M	$61.90M	$284.4M
YoY Change	33.93%	193.36%	108.37%
INVESTING ACTIVITIES
Capital Expenditures	-$88.90M	-$96.30M	$251.9M
YoY Change	-7.68%	43.73%	-203.46%
Acquisitions
YoY Change
Other Investing Activities	-$9.000M	$1.400M	-$1.271M
YoY Change	-742.86%	-95.29%	-103.12%
Cash From Investing Activities	-$97.70M	-$94.90M	-$242.4M
YoY Change	2.95%	154.42%	19.53%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			-$22.89M
YoY Change			-144.96%
Debt Paid & Issued, Net			$89.17M
YoY Change
Cash From Financing Activities	58.20M	57.10M	$2.139M
YoY Change	1.93%	-274.62%	-96.82%
NET CHANGE
Cash From Operating Activities	82.90M	61.90M	$284.4M
Cash From Investing Activities	-97.70M	-94.90M	-$242.4M
Cash From Financing Activities	58.20M	57.10M	$2.139M
Net Change In Cash	43.40M	24.10M	$44.16M
YoY Change	80.08%	-149.28%	4806.56%
FREE CASH FLOW
Cash From Operating Activities	$82.90M	$61.90M	$284.4M
Capital Expenditures	-$88.90M	-$96.30M	$251.9M
Free Cash Flow	$171.8M	$158.2M	$32.49M
YoY Change	8.6%	79.57%	-91.45%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	100432000	USD
CY2010Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	103100000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	66296000	USD
CY2010Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	62114000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Noncurrent AccountsReceivableNetNoncurrent	5621000	USD
CY2010Q4	us-gaap	Accounts Receivable Net Noncurrent AccountsReceivableNetNoncurrent	3965000	USD
CY2010Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	0	USD
CY2011Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	505000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2969000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2569000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-14191000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-12537000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-11622000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-9568000	USD
CY2011Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	4400000	USD
CY2011	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	337770000	USD
CY2009	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	251951000	USD
CY2010	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	338252000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4207000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3706000	USD
CY2009	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4199000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1499000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1239000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Accounts Receivable Noncurrent AllowanceForDoubtfulAccountsReceivableNoncurrent	1861000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Noncurrent AllowanceForDoubtfulAccountsReceivableNoncurrent	2743000	USD
CY2010Q4	us-gaap	Allowance For Doubtful Other Receivables Current AllowanceForDoubtfulOtherReceivablesCurrent	1471000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Other Receivables Current AllowanceForDoubtfulOtherReceivablesCurrent	196000	USD
CY2009	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	594107	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	137880	shares
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	332182	shares
CY2009Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	16240000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	16952000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	21367000	USD
CY2010	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	819000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	936000	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	-1036000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	-451000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	3930000	USD
CY2010	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	929000	USD
CY2011Q4	us-gaap	Assets Assets	4960609000	USD
CY2010Q4	us-gaap	Assets Assets	4676055000	USD
CY2009Q4	us-gaap	Assets Assets	4238727000	USD
CY2010Q4	us-gaap	Assets Current AssetsCurrent	464038000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	310972000	USD
CY2010Q4	us-gaap	Assets Noncurrent Other Than Noncurrent Investments And Property Plant And Equipment AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment	847691000	USD
CY2011Q4	us-gaap	Assets Noncurrent Other Than Noncurrent Investments And Property Plant And Equipment AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment	1043116000	USD
CY2011Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	22205000	USD
CY2010Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	24561000	USD
CY2009	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	0	USD
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	0	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains Losses Sale Proceeds AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds	0	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	1000	USD
CY2010Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	0	USD
CY2010Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	0
CY2011Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	1
CY2011Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2010Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2010Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	4876000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	4220000	USD
CY2009	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	19075000	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	26331000	USD
CY2010	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	33949000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	27813000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	228677000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	8828000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	52987000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	151975000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	100000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	175690000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-200864000	USD
CY2009	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	44159000	USD
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.20
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.20
CY2009	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.20
CY2010Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2011Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2010Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	120000000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	120000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	49964172	shares
CY2010Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	49419452	shares
CY2008Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	46929203	shares
CY2009Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	47925882	shares
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	828389000	USD
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	807842000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	141497000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	164639000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	124790000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	169000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	25000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-338000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	124815000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	141159000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	164808000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-39518000	USD
CY2009	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	6199000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-10000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	6307000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	780000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-45478000	USD
CY2009	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	108000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	790000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-5960000	USD
CY2010Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	615000	USD
CY2011Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	0	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-22582000	USD
CY2009	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	23309000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	23940000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	18800000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	22655000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-27018000	USD
CY2010	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	41742000	USD
CY2009	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	19035000	USD
CY2011	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-52913000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1285000	USD
CY2009	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-4509000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-4436000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	0	USD
CY2011Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	10594000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-555758000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-755888000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	300524000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	345161000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	16159000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1101049000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Other Capitalized Costs DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts	3464000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Other Capitalized Costs DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts	7611000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	19749000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	18380000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	10715000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	8617000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5380000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	46199000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	45473000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	120229000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	119310000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	88827000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	122445000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	21299000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	22172000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	12958000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	8292000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	856282000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	772047000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	566473000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	21797000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	17451000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Prepaid Pension Costs DeferredTaxLiabilitiesPrepaidPensionCosts	93997000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Prepaid Pension Costs DeferredTaxLiabilitiesPrepaidPensionCosts	122712000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	284794000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	333335000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	0	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssets	11833000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	599992000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	422216000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	124659000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	121849000	USD
CY2009	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	118600000	USD
CY2011Q4	us-gaap	Derivative Asset Fair Value Net DerivativeAssetFairValueNet	6316000	USD
CY2010Q4	us-gaap	Derivative Asset Fair Value Net DerivativeAssetFairValueNet	3470000	USD
CY2010Q4	us-gaap	Derivative Assets DerivativeAssets	573000	USD
CY2011Q4	us-gaap	Derivative Assets DerivativeAssets	3754000	USD
CY2011Q4	us-gaap	Derivative Financial Instruments Liabilities Fair Value Disclosure DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure	4707000	USD
CY2010Q4	us-gaap	Derivative Financial Instruments Liabilities Fair Value Disclosure DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure	508000	USD
CY2010Q4	us-gaap	Derivative Liability Fair Value Net DerivativeLiabilityFairValueNet	5174000	USD
CY2011Q4	us-gaap	Derivative Liability Fair Value Net DerivativeLiabilityFairValueNet	7269000	USD
CY2011Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	7000000	USD
CY2011	us-gaap	Derivatives Methods Of Accounting Nonhedging Derivatives DerivativesMethodsOfAccountingNonhedgingDerivatives	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">All commodity-related derivative instruments not meeting the normal purchases and normal sales exception to derivative accounting are recorded at fair value on the balance sheet.  Because of Idaho Power's PCA mechanisms, unrealized gains and losses associated with the changes in fair value of these derivative instruments are recorded as regulatory assets or liabilities. With the exception of forward contracts for the purchase of natural gas for use at Idaho Power’s natural gas generation facilities, Idaho Power’s physical forward contracts qualify for the normal purchases and normal sales exception.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">All of Idaho Power's derivative instruments have been entered into for the purpose of economically hedging forecasted purchases and sales, though none of these instruments have been designated as cash flow hedges under derivative accounting guidance. Idaho Power offsets fair value amounts recognized on its balance sheet related to derivative instruments executed with the same counterparty under the same master netting agreement.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;"></font></div></div>
CY2011	us-gaap	Derivatives Reporting Of Derivative Activity DerivativesReportingOfDerivativeActivity	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Settlement gains and losses on electricity swap contracts are recorded on the income statement in off-system sales or purchased power depending on the forecasted position being economically hedged by the derivative contract.  Settlement gains and losses on both financial and physical contracts for natural gas are reflected in fuel expense.  Settlement gains and losses on diesel derivatives are recorded in other operations and maintenance expense.</font></div></div>
CY2011	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">New Accounting Pronouncements</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Financial Accounting Standards Board (FASB) has issued the following accounting guidance, which is effective for years beginning after December 15, 2011:</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In May 2011, the FASB issued guidance to provide a consistent definition of fair value and ensure that the fair value measurement and disclosure requirements are similar between generally accepted accounting principles in the United States and International Financial Reporting Standards. The guidance changes certain fair value measurement principles and enhances the disclosure requirements, particularly for Level 3 fair value measurements. IDACORP and Idaho Power are currently assessing the impact of the guidance but do not believe that the adoption of this guidance will have a material effect on their consolidated financial statements.</font></div></td></tr></table><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></div>
CY2009	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.64
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.37
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.96
CY2009	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.64
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.95
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.36
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.005
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.455
CY2009	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.152
CY2011	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	834545000	USD
CY2010	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	870371000	USD
CY2009	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	883765000	USD
CY2010	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	1033052000	USD
CY2009	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	1045996000	USD
CY2011	us-gaap	Electric Utility Revenue ElectricUtilityRevenue	1022728000	USD
CY2011Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	47865000	USD
CY2011	us-gaap	Electrical Generation Revenue ElectricalGenerationRevenue	101602000	USD
CY2010	us-gaap	Electrical Generation Revenue ElectricalGenerationRevenue	78133000	USD
CY2009	us-gaap	Electrical Generation Revenue ElectricalGenerationRevenue	94373000	USD
CY2009	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
CY2010	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
CY2011	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1449000	USD
CY2009	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1642000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1645000	USD
CY2010Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	27547000	USD
CY2009	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	12477000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	6530000	USD
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	2500000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	10782000	USD
CY2010Q4	us-gaap	Equity Method Investments EquityMethodInvestments	10795000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	20015000	USD
CY2010Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	22120000	USD
CY2011	us-gaap	Guarantees Indemnifications And Warranties Policies GuaranteesIndemnificationsAndWarrantiesPolicies	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">IDACORP and Idaho Power enter into financial agreements and power purchase and sale agreements that include indemnification provisions relating to various forms of claims or liabilities that may arise from the transactions contemplated by these agreements.  Generally, a maximum obligation is not explicitly stated in the indemnification provisions and, therefore, the overall maximum amount of the obligation under such indemnification provisions cannot be reasonably estimated.  IDACORP and Idaho Power periodically evaluate the likelihood of incurring costs under such indemnities based on their historical experience and the evaluation of the specific indemnities.  As of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2011</font><font style="font-family:inherit;font-size:10pt;">, management believes the likelihood is remote that IDACORP or Idaho Power would be required to perform under such indemnification provisions or otherwise incur any significant losses with respect to such indemnification obligations.  Neither IDACORP nor Idaho Power has recorded any liability on their respective consolidated balance sheets with respect to these indemnification obligations.</font></div></div>
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	114729000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	141729000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	146737000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3008000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	798000	USD
CY2009	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1033000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-731000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22362000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-52133000	USD
CY2011	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	-52133000	USD
CY2009	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	22362000	USD
CY2010	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	-731000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	40096000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	49723000	USD
CY2009	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	51349000	USD
CY2009	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	3895000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	13138000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	14100000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1736000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-5458000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-6029000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1375000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4565000	USD
CY2009	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1216000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	1138000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	0	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	74436000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3378000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3404000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3355000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	7870000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	7309000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	6438000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-63138000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-4119000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-1138000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-12405000	USD
CY2009	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-21401000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-27112000	USD
CY2010Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	12130000	USD
CY2011Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	421000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	4014000	USD
CY2009	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-28038000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	5428000	USD
CY2010	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-14216000	USD
CY2009	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	28535000	USD
CY2011	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	15113000	USD
CY2011	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	19684000	USD
CY2009	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	14053000	USD
CY2010	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-3848000	USD
CY2010	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	13682000	USD
CY2011	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	2171000	USD
CY2009	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-7485000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-1621000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3662000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-4330000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-4229000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-5376000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-20439000	USD
CY2011	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-68045000	USD
CY2009	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-57836000	USD
CY2010	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-46510000	USD
CY2009	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	16000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	16000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	32000	shares
CY2011	us-gaap	Interest Expense InterestExpense	71526000	USD
CY2009	us-gaap	Interest Expense InterestExpense	72810000	USD
CY2010	us-gaap	Interest Expense InterestExpense	75114000	USD
CY2010	us-gaap	Interest Expense Debt InterestExpenseDebt	80490000	USD
CY2009	us-gaap	Interest Expense Debt InterestExpenseDebt	73371000	USD
CY2011	us-gaap	Interest Expense Debt InterestExpenseDebt	79349000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	70969000	USD
CY2009	us-gaap	Interest Paid Net InterestPaidNet	67039000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	69049000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	21797000	USD
CY2010Q4	us-gaap	Interest Payable Current InterestPayableCurrent	23937000	USD
CY2011	us-gaap	Investment Tax Credit InvestmentTaxCredit	-1132000	USD
CY2009	us-gaap	Investment Tax Credit InvestmentTaxCredit	236000	USD
CY2010	us-gaap	Investment Tax Credit InvestmentTaxCredit	-1533000	USD
CY2011Q4	us-gaap	Investments Investments	201142000	USD
CY2010Q4	us-gaap	Investments Investments	204798000	USD
CY2009	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3500000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3400000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	5300000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4960609000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4676055000	USD
CY2010Q4	us-gaap	Liabilities Current LiabilitiesCurrent	449059000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	368247000	USD
CY2010Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1202725000	USD
CY2011Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1543118000	USD
CY2011Q4	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	0	USD
CY2010Q4	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	74436000	USD
CY2010Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	26672000	USD
CY2011Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	24060000	USD
CY2011Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	101064000	USD
CY2010Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	122572000	USD
CY2010Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1488287000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1387550000	USD
CY2010Q4	us-gaap	Long Term Investments LongTermInvestments	202944000	USD
CY2011Q4	us-gaap	Long Term Investments LongTermInvestments	199931000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	4040000	USD
CY2010Q4	us-gaap	Minority Interest MinorityInterest	3871000	USD
CY2011	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Nature of Business</font></div><div style="line-height:120%;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">IDACORP is a holding company formed in 1998 whose principal operating subsidiary is Idaho Power.  Idaho Power is an electric utility with a service territory covering approximately 24,000 square miles in southern Idaho and eastern Oregon.  Idaho Power is regulated by the Federal Energy Regulatory Commission (FERC) and the state regulatory commissions of Idaho and Oregon.  Idaho Power is the parent of Idaho Energy Resources Co. (IERCo), a joint venturer in Bridger Coal Company (BCC), which mines and supplies coal to the Jim Bridger generating plant owned in part by Idaho Power.</font></div><div style="line-height:120%;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">IDACORP’s other subsidiaries include IDACORP Financial Services, Inc. (IFS), an investor in affordable housing and other real estate investments; Ida-West Energy Company (Ida-West), an operator of small hydroelectric generation projects that satisfy the requirements of the Public Utility Regulatory Policies Act of 1978 (PURPA); and IDACORP Energy (IE), a marketer of energy commodities, which wound down operations in 2003.</font></div></div>
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	198624000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2139000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-178749000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-332358000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-242405000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-328334000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	284425000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	310243000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	305400000	USD
CY2009	us-gaap	Net Income Loss NetIncomeLoss	124350000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	166693000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	142798000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	169000	USD
CY2009	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	25000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-338000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	12125000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	18906000	USD
CY2009	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	11931000	USD
CY2009	us-gaap	Notes Issued1 NotesIssued1	8276000	USD
CY2010	us-gaap	Notes Issued1 NotesIssued1	1509000	USD
CY2011	us-gaap	Notes Issued1 NotesIssued1	0	USD
CY2011Q4	us-gaap	Notes Payable Current NotesPayableCurrent	54200000	USD
CY2010Q4	us-gaap	Notes Payable Current NotesPayableCurrent	66900000	USD
CY2010	us-gaap	Operating Expenses OperatingExpenses	837359000	USD
CY2011	us-gaap	Operating Expenses OperatingExpenses	862508000	USD
CY2009	us-gaap	Operating Expenses OperatingExpenses	846217000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	164248000	USD
CY2009	us-gaap	Operating Income Loss OperatingIncomeLoss	203583000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	198670000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	2041000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	1203000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	2199000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	2768000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	2875000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	15711000	USD
CY2009	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax	-885000	USD
CY2011	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax	-1062000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1820000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1149000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	738000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1169000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	4606000	USD
CY2010Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1854000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	40352000	USD
CY2010Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	41762000	USD
CY2010	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Net Of Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax	2450000	USD
CY2009	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Net Of Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentNetOfTax	1380000	USD
CY2010	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentTax	-1573000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-257000	USD
CY2010Q4	us-gaap	Other Deductions Or Allowable Credits OtherDeductionsOrAllowableCredits	17000000	USD
CY2011	us-gaap	Other General Expense OtherGeneralExpense	4146000	USD
CY2009	us-gaap	Other General Expense OtherGeneralExpense	6414000	USD
CY2010	us-gaap	Other General Expense OtherGeneralExpense	4615000	USD
CY2010	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	3040000	USD
CY2009	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	5066000	USD
CY2011	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	2303000	USD
CY2011Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	46490000	USD
CY2010Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	45601000	USD
CY2010Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	50103000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	60511000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	75805000	USD
CY2010Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	74470000	USD
CY2009	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-10207000	USD
CY2011	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-4487000	USD
CY2010	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-3061000	USD
CY2010	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	-1750000	USD
CY2009	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	-2909000	USD
CY2011	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	-2530000	USD
CY2011	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	107000	USD
CY2010	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	2199000	USD
CY2009	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	3967000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	21209000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	15165000	USD
CY2009	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	16997000	USD
CY2011Q4	us-gaap	Other Receivables OtherReceivables	8197000	USD
CY2010Q4	us-gaap	Other Receivables OtherReceivables	10157000	USD
CY2010	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	2977000	USD
CY2011	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	4028000	USD
CY2009	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	3804000	USD
CY2011Q4	us-gaap	Other Tax Carryforward Gross Amount OtherTaxCarryforwardGrossAmount	25200000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	0	USD
CY2009	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1271000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3296000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-4918000	USD
CY2009	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1441000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1933000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	869000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	59668000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1677609000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	1614013000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	591475000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	57872000	USD
CY2009	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	56820000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	7000000	USD
CY2009	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	0	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	0	USD
CY2009	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2010	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2011	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	2645000	USD
CY2010	us-gaap	Payments To Acquire Partners Interest In Real Estate Partnership Net Of Cash Acquired PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired	13390000	USD
CY2011	us-gaap	Payments To Acquire Partners Interest In Real Estate Partnership Net Of Cash Acquired PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired	1558000	USD
CY2009	us-gaap	Payments To Acquire Partners Interest In Real Estate Partnership Net Of Cash Acquired PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired	5802000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	337765000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	338252000	USD
CY2009	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	251937000	USD
CY2011	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	22088000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	65601000	USD
CY2009	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	7569000	USD
CY2010	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	14728000	USD
CY2011	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	45223000	USD
CY2009	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	11594000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	363209000	USD
CY2010Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	263688000	USD
CY2011Q4	us-gaap	Plant Held For Future Use Amount PlantHeldForFutureUseAmount	6974000	USD
CY2010Q4	us-gaap	Plant Held For Future Use Amount PlantHeldForFutureUseAmount	7076000	USD
CY2011Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	12405000	USD
CY2010Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	11063000	USD
CY2010	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	24000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	17501000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	48644000	USD
CY2009	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	24328000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2009	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	230000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	200000000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	0	USD
CY2009	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	425000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	0	USD
CY2009	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-7254000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-885000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3365000	USD
CY2011	us-gaap	Proceeds From Repayments Of Other Long Term Debt ProceedsFromRepaymentsOfOtherLongTermDebt	0	USD
CY2009	us-gaap	Proceeds From Repayments Of Other Long Term Debt ProceedsFromRepaymentsOfOtherLongTermDebt	-170000000	USD
CY2010	us-gaap	Proceeds From Repayments Of Other Long Term Debt ProceedsFromRepaymentsOfOtherLongTermDebt	0	USD
CY2011	us-gaap	Proceeds From Repayments Of Pollution Control Bond ProceedsFromRepaymentsOfPollutionControlBond	0	USD
CY2010	us-gaap	Proceeds From Repayments Of Pollution Control Bond ProceedsFromRepaymentsOfPollutionControlBond	0	USD
CY2009	us-gaap	Proceeds From Repayments Of Pollution Control Bond ProceedsFromRepaymentsOfPollutionControlBond	166100000	USD
CY2009	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-93600000	USD
CY2010	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	13150000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-12700000	USD
CY2009	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	9006000	USD
CY2010	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	0	USD
CY2011	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	0	USD
CY2009	us-gaap	Proceeds From Sale Of Other Productive Assets ProceedsFromSaleOfOtherProductiveAssets	2250000	USD
CY2011	us-gaap	Proceeds From Sale Of Other Productive Assets ProceedsFromSaleOfOtherProductiveAssets	0	USD
CY2010	us-gaap	Proceeds From Sale Of Other Productive Assets ProceedsFromSaleOfOtherProductiveAssets	0	USD
CY2011	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2009	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	0	USD
CY2010	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	18982000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	142460000	USD
CY2009	us-gaap	Profit Loss ProfitLoss	124375000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	166862000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3161382000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3406590000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	18877000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	19315000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	16551000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	25484000	USD
CY2009	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	7555000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	17000000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	25000000	USD
CY2009	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	8000000	USD
CY2009	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	5000000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	13000000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	11000000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.08
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.078
CY2009	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.067
CY2010Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	6216000	USD
CY2011Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	34279000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	953068000	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	733879000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	840916000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-200000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	200000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-200000	USD
CY2011	ida	Income Tax Reconciliation Capitalized Interest IncomeTaxReconciliationCapitalizedInterest	6465000	USD
CY2009	ida	Income Tax Reconciliation Capitalized Overhead Costs IncomeTaxReconciliationCapitalizedOverheadCosts	-3500000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	416950000	USD
CY2009	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0281
CY2011	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0283
CY2010	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0284
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	1377239000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	1434925000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	1792305000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	1832287000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	2718041000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	2789264000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	307308000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	327877000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	4466873000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	4332054000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	871784000	USD
CY2010Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	855202000	USD
CY2011Q4	us-gaap	Ratio Of Indebtedness To Net Capital RatioOfIndebtednessToNetCapital	0.48
CY2011Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	62556000	USD
CY2010Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	73583000	USD
CY2011	us-gaap	Reclassifications Reclassifications	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Reclassifications</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain prior year amounts have been reclassified to conform to the current year presentation. Net income, cash flows, and shareholders' equity were not affected by these reclassifications. </font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain amounts related to regulatory assets and liabilities that were included in noncurrent regulatory assets and liabilities were reclassified as current regulatory assets and liabilities in the consolidated balance sheets.</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Pension and other postretirement benefits of </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">$264 million</font><font style="font-family:inherit;font-size:10pt;"> were reclassified from other noncurrent liabilities to a separate line in the consolidated balance sheets.</font></div></td></tr></table></div>
CY2010Q4	us-gaap	Regulatory Assets RegulatoryAssets	758815000	USD
CY2011Q4	us-gaap	Regulatory Assets RegulatoryAssets	987347000	USD
CY2010Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	753172000	USD
CY2011Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	361795000	USD
CY2010Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	306105000	USD
CY2011Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	29738000	USD
CY2010Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	8011000	USD
CY2011Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	332057000	USD
CY2010Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	298094000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	121064000	USD
CY2009	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	89174000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1064000	USD
CY2009	us-gaap	Sales Revenue Net SalesRevenueNet	1049800000	USD
CY2011	us-gaap	Sales Revenue Net SalesRevenueNet	1026756000	USD
CY2010	us-gaap	Sales Revenue Net SalesRevenueNet	1036029000	USD
CY2010Q4	us-gaap	Trading Securities Fair Value Disclosure TradingSecuritiesFairValueDisclosure	5361000	USD
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	12177	shares
CY2010Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	14302	shares
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	29000	USD
CY2010Q4	us-gaap	Treasury Stock Value TreasuryStockValue	40000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2008Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4119000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	27806	shares
CY2011Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	54200000	USD
CY2010Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	66900000	USD
CY2010Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0043
CY2011Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0047
CY2010	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	20102000	USD
CY2011	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	65574000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	1532113000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1657654000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1661694000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1535984000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1401544000	USD
CY2011Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	94100000	USD
CY2011	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	28895000	USD
CY2010	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	24046000	USD
CY2009	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	21069000	USD
CY2011Q4	us-gaap	Trading Securities Fair Value Disclosure TradingSecuritiesFairValueDisclosure	3439000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1138000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	74436000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-66379000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-1138000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-4119000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2009	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	110626000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2822000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	71614000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1138000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities	-8057	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	200000	USD
CY2009	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	167198000	USD
CY2010	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	143769000	USD
CY2011	us-gaap	Utilities Operating Expense Purchased Power UtilitiesOperatingExpensePurchasedPower	163336000	USD
CY2010	us-gaap	Utilities Operating Expense Purchased Power Under Long Term Contracts UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts	54972000	USD
CY2011	us-gaap	Utilities Operating Expense Purchased Power Under Long Term Contracts UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts	90251000	USD
CY2011	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Management Estimates</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Management makes estimates and assumptions when preparing financial statements in conformity with generally accepted accounting principles (GAAP).  These estimates and assumptions include those related to rate regulation, retirement benefits, contingencies, litigation, asset impairment, income taxes, unbilled revenues, and bad debt.  These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period.  These estimates involve judgments with respect to, among other things, future economic factors that are difficult to predict and are beyond management’s control.  As a result, actual results could differ from those estimates.</font></div></div>
CY2011	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	858362000	USD
CY2010	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	832744000	USD
CY2009	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	839803000	USD
CY2011	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	119789000	USD
CY2010	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	115921000	USD
CY2009	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	149566000	USD
CY2010	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	159673000	USD
CY2011	us-gaap	Utilities Operating Expense Fuel Used UtilitiesOperatingExpenseFuelUsed	131542000	USD
CY2009	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	292813000	USD
CY2011	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	338640000	USD
CY2010	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	293925000	USD
CY2009	us-gaap	Utilities Operating Expense Purchased Power Under Long Term Contracts UtilitiesOperatingExpensePurchasedPowerUnderLongTermContracts	59023000	USD
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48340000	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47182000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49558000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48193000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49457000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47124000	shares
CY2010Q4	ida	Accrued Unbilled Revenue AccruedUnbilledRevenue	47964000	USD
CY2011Q4	ida	Accrued Unbilled Revenue AccruedUnbilledRevenue	46441000	USD
CY2011	ida	Average Price Of Purchased Power Under Long Term Contracts AveragePriceOfPurchasedPowerUnderLongTermContracts	60.36	USD
CY2009	ida	Deferred Investment Tax Credit DeferredInvestmentTaxCredit	3640000	USD
CY2010	ida	Deferred Investment Tax Credit DeferredInvestmentTaxCredit	1845000	USD
CY2011	ida	Deferred Investment Tax Credit DeferredInvestmentTaxCredit	2223000	USD
CY2011Q4	ida	Deferred Tax Assets Construction Advances DeferredTaxAssetsConstructionAdvances	5118000	USD
CY2010Q4	ida	Deferred Tax Assets Construction Advances DeferredTaxAssetsConstructionAdvances	7061000	USD
CY2011Q4	ida	Deferred Tax Assets Power Cost Adjustments DeferredTaxAssetsPowerCostAdjustments	1711000	USD
CY2010Q4	ida	Deferred Tax Assets Power Cost Adjustments DeferredTaxAssetsPowerCostAdjustments	0	USD
CY2011Q4	ida	Dividend Distribution Restriction Amount DividendDistributionRestrictionAmount	827000000	USD
CY2011Q4	ida	Earnings Test Does Not Apply To Refunding Bonds That Mature In Less Than This Period Of Time EarningsTestDoesNotApplyToRefundingBondsThatMatureInLessThanThisPeriodOfTime	P2Y
CY2011	ida	Effective Income Tax Rate Reconciliation Removal Costs EffectiveIncomeTaxRateReconciliationRemovalCosts	-2244000	USD
CY2009	ida	Effective Income Tax Rate Reconciliation Removal Costs EffectiveIncomeTaxRateReconciliationRemovalCosts	-3810000	USD
CY2010	ida	Effective Income Tax Rate Reconciliation Removal Costs EffectiveIncomeTaxRateReconciliationRemovalCosts	-2850000	USD
CY2009	ida	Effective Income Tax Rate Reconciliation Repair Allowance EffectiveIncomeTaxRateReconciliationRepairAllowance	-3500000	USD
CY2010	ida	Effective Income Tax Rate Reconciliation Repair Allowance EffectiveIncomeTaxRateReconciliationRepairAllowance	0	USD
CY2011	ida	Effective Income Tax Rate Reconciliation Repair Allowance EffectiveIncomeTaxRateReconciliationRepairAllowance	0	USD
CY2010	ida	Energy Efficiency Programs EnergyEfficiencyPrograms	44184000	USD
CY2009	ida	Energy Efficiency Programs EnergyEfficiencyPrograms	31821000	USD
CY2011	ida	Energy Efficiency Programs EnergyEfficiencyPrograms	37663000	USD
CY2011	ida	Fair Value All Levels Transfers Amount FairValueAllLevelsTransfersAmount	0	USD
CY2009	ida	Federal Uncertain Tax Positions Expensebenefit FederalUncertainTaxPositionsExpensebenefit	-2496000	USD
CY2011	ida	Federal Uncertain Tax Positions Expensebenefit FederalUncertainTaxPositionsExpensebenefit	-66225000	USD
CY2010	ida	Federal Uncertain Tax Positions Expensebenefit FederalUncertainTaxPositionsExpensebenefit	65222000	USD
CY2010	ida	Income Tax Reconciliation Afudc IncomeTaxReconciliationAfudc	-9529000	USD
CY2011	ida	Income Tax Reconciliation Afudc IncomeTaxReconciliationAfudc	-13586000	USD
CY2009	ida	Income Tax Reconciliation Afudc IncomeTaxReconciliationAfudc	-4533000	USD
CY2009	ida	Income Tax Reconciliation Capitalized Interest IncomeTaxReconciliationCapitalizedInterest	1529000	USD
CY2010	ida	Income Tax Reconciliation Capitalized Interest IncomeTaxReconciliationCapitalizedInterest	3674000	USD
CY2011Q2	dei	Entity Public Float EntityPublicFloat	1588107885	USD
CY2011	dei	Entity Registrant Name EntityRegistrantName	IDACORP INC.
CY2011	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2011	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2011	dei	Trading Symbol TradingSymbol	IDA
CY2011	ida	Income Tax Reconciliation Capitalized Overhead Costs IncomeTaxReconciliationCapitalizedOverheadCosts	-5950000	USD
CY2010	ida	Income Tax Reconciliation Capitalized Overhead Costs IncomeTaxReconciliationCapitalizedOverheadCosts	-3500000	USD
CY2010	ida	Income Tax Reconciliation Capitalized Repair Costs IncomeTaxReconciliationCapitalizedRepairCosts	-10500000	USD
CY2009	ida	Income Tax Reconciliation Capitalized Repair Costs IncomeTaxReconciliationCapitalizedRepairCosts	0	USD
CY2011	ida	Income Tax Reconciliation Capitalized Repair Costs IncomeTaxReconciliationCapitalizedRepairCosts	-14000000	USD
CY2010	ida	Income Tax Reconciliation Tax Method Change Capitalized Repairs IncomeTaxReconciliationTaxMethodChangeCapitalizedRepairs	-44466000	USD
CY2011	ida	Income Tax Reconciliation Tax Method Change Capitalized Repairs IncomeTaxReconciliationTaxMethodChangeCapitalizedRepairs	0	USD
CY2009	ida	Income Tax Reconciliation Tax Method Change Capitalized Repairs IncomeTaxReconciliationTaxMethodChangeCapitalizedRepairs	0	USD
CY2009	ida	Income Tax Reconciliation Tax Method Change Uniform Capitalization IncomeTaxReconciliationTaxMethodChangeUniformCapitalization	0	USD
CY2011	ida	Income Tax Reconciliation Tax Method Change Uniform Capitalization IncomeTaxReconciliationTaxMethodChangeUniformCapitalization	0	USD
CY2010	ida	Income Tax Reconciliation Tax Method Change Uniform Capitalization IncomeTaxReconciliationTaxMethodChangeUniformCapitalization	-65333000	USD
CY2009	ida	Increase Decrease In Accounts Receivable And Prepayments IncreaseDecreaseInAccountsReceivableAndPrepayments	15749000	USD
CY2011	ida	Increase Decrease In Accounts Receivable And Prepayments IncreaseDecreaseInAccountsReceivableAndPrepayments	2232000	USD
CY2010	ida	Increase Decrease In Accounts Receivable And Prepayments IncreaseDecreaseInAccountsReceivableAndPrepayments	-14243000	USD
CY2009	ida	Incremental Common Shares Attributable To Restricted Stock IncrementalCommonSharesAttributableToRestrictedStock	42000	shares
CY2011	ida	Incremental Common Shares Attributable To Restricted Stock IncrementalCommonSharesAttributableToRestrictedStock	85000	shares
CY2010	ida	Incremental Common Shares Attributable To Restricted Stock IncrementalCommonSharesAttributableToRestrictedStock	115000	shares
CY2011Q4	ida	Investment Tax Credit Percent InvestmentTaxCreditPercent	0.03
CY2011Q4	ida	Late Payment Fee Customer Billings LatePaymentFeeCustomerBillings	0.01
CY2011	ida	Maturity Period Of Short Term Investments MaturityPeriodOfShortTermInvestments	P90D
CY2011Q4	ida	Maximum Leverage Ratio Requirement MaximumLeverageRatioRequirement	0.65
CY2011Q4	ida	Number Of Cspp Facilities Contracted NumberOfCsppFacilitiesContracted	119	facility
CY2011Q4	ida	Number Of Cspp Facilities Not On Line NumberOfCsppFacilitiesNotOnLine	23	facility
CY2011Q4	ida	Number Of Cspp Facilities On Line NumberOfCsppFacilitiesOnLine	96	facility
CY2011Q4	ida	Number Of Extensions Of Credit Agreement NumberOfExtensionsOfCreditAgreement	2	Y
CY2010	ida	Other Electric Utility Revenue OtherElectricUtilityRevenue	84548000	USD
CY2009	ida	Other Electric Utility Revenue OtherElectricUtilityRevenue	67858000	USD
CY2011	ida	Other Electric Utility Revenue OtherElectricUtilityRevenue	86581000	USD
CY2010	ida	Other Interest Expense Net Of Afudc OtherInterestExpenseNetOfAfudc	-5376000	USD
CY2011	ida	Other Interest Expense Net Of Afudc OtherInterestExpenseNetOfAfudc	-7823000	USD
CY2009	ida	Other Interest Expense Net Of Afudc OtherInterestExpenseNetOfAfudc	-561000	USD
CY2011Q4	ida	Percent Of Operating Revenues Required To Be Spent Or Appropriated PercentOfOperatingRevenuesRequiredToBeSpentOrAppropriated	0.15
CY2011Q4	ida	Period Of Extension Of Credit Agreement PeriodOfExtensionOfCreditAgreement	P1Y
CY2011Q4	ida	Period Of Time After Which Unpaid Accounts Are Deemed Late PeriodOfTimeAfterWhichUnpaidAccountsAreDeemedLate	P30D
CY2011	ida	Power Cost Adjustment PowerCostAdjustment	38497000	USD
CY2009	ida	Power Cost Adjustment PowerCostAdjustment	66710000	USD
CY2010	ida	Power Cost Adjustment PowerCostAdjustment	51226000	USD
CY2009	ida	Proceeds From Sale Of Emission Allowances And Recs ProceedsFromSaleOfEmissionAllowancesAndRecs	2382000	USD
CY2010	ida	Proceeds From Sale Of Emission Allowances And Recs ProceedsFromSaleOfEmissionAllowancesAndRecs	6408000	USD
CY2011	ida	Proceeds From Sale Of Emission Allowances And Recs ProceedsFromSaleOfEmissionAllowancesAndRecs	6314000	USD
CY2009	ida	Purchased Mwh Under Long Term Contracts PurchasedMwhUnderLongTermContracts	970419	MWh
CY2010	ida	Purchased Mwh Under Long Term Contracts PurchasedMwhUnderLongTermContracts	910429	MWh
CY2011	ida	Purchased Mwh Under Long Term Contracts PurchasedMwhUnderLongTermContracts	1495108	MWh
CY2011Q4	ida	Range Of Contract Length Maximum RangeOfContractLengthMaximum	P35Y
CY2011Q4	ida	Range Of Contract Length Mimimum RangeOfContractLengthMimimum	P1Y
CY2011	ida	Restored Investment Tax Credit RestoredInvestmentTaxCredit	3355000	USD
CY2009	ida	Restored Investment Tax Credit RestoredInvestmentTaxCredit	3404000	USD
CY2010	ida	Restored Investment Tax Credit RestoredInvestmentTaxCredit	3378000	USD
CY2010	ida	State Taxes Paid Due To Method Changes StateTaxesPaidDueToMethodChanges	-6000000	USD
CY2010	ida	State Uncertain Tax Position Expensebenefit StateUncertainTaxPositionExpensebenefit	8076000	USD
CY2009	ida	State Uncertain Tax Position Expensebenefit StateUncertainTaxPositionExpensebenefit	-485000	USD
CY2011	ida	State Uncertain Tax Position Expensebenefit StateUncertainTaxPositionExpensebenefit	-8211000	USD
CY2011Q4	ida	Time Period Expenditures Or Appropriations Can Be Made Up TimePeriodExpendituresOrAppropriationsCanBeMadeUp	P5Y
CY2011	ida	Total Uncertain Tax Positions Expensebenefit TotalUncertainTaxPositionsExpensebenefit	-74436000	USD
CY2010	ida	Total Uncertain Tax Positions Expensebenefit TotalUncertainTaxPositionsExpensebenefit	73298000	USD
CY2009	ida	Total Uncertain Tax Positions Expensebenefit TotalUncertainTaxPositionsExpensebenefit	-2981000	USD
CY2011	dei	Amendment Flag AmendmentFlag	false
CY2011	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2011	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2011	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2011
CY2011	dei	Document Period End Date DocumentPeriodEndDate	2011-12-31
CY2011	dei	Document Type DocumentType	10-K
CY2011	dei	Entity Central Index Key EntityCentralIndexKey	0001057877
CY2012Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	49947098	shares
CY2011	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2011	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer

Files In Submission

Name	View Source	Status
0001057877-12-000044-index-headers.html	Edgar Link	pending
0001057877-12-000044-index.html	Edgar Link	pending
0001057877-12-000044.txt	Edgar Link	pending
0001057877-12-000044-xbrl.zip	Edgar Link	pending
exhibit1021-smspiiam2011.htm	Edgar Link	pending
exhibit1026-nonxemployeedi.htm	Edgar Link	pending
exhibit1032-112012changein.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
ida-20111231.xml	Edgar Link	completed
ida-20111231.xsd	Edgar Link	pending
ida-20111231_cal.xml	Edgar Link	unprocessable
ida-20111231_def.xml	Edgar Link	unprocessable
ida-20111231_lab.xml	Edgar Link	unprocessable
ida-20111231_pre.xml	Edgar Link	unprocessable
ida12311110k.htm	Edgar Link	pending
ida123111ex121.htm	Edgar Link	pending
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ida123111ex231-consent.htm	Edgar Link	pending
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$IDA
IDACORP INC Stock $ida

2010 Q4 Form 10-K Financial Statement

#000105787712000044 Filed on February 22, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IDA IDACORP INC Stock $ida

2010 Q4 Form 10-K Financial Statement

#000105787712000044 Filed on February 22, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IDA
IDACORP INC Stock $ida