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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) Statement (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interests | Arizona Public Service Company | Arizona Public Service Company Common Stock | Arizona Public Service Company Additional Paid-in Capital | Arizona Public Service Company Retained Earnings | Arizona Public Service Company Accumulated Other Comprehensive Income (Loss) | Arizona Public Service Company Noncontrolling Interests
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Beginning balance at Dec. 31, 2013 |  | $ 4,340,460 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 2,491,558 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (4,308)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 1,785,273 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (78,053)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 145,990 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 4,454,874 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | $ 178,162 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 2,379,696 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,804,398 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (53,372)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 145,990 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Beginning balance (in shares) at Dec. 31, 2013 |  |  | 110,280,703 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 98,944 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 71,264,947 us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 24,691 us-gaap_ProfitLoss |  |  | 15,766 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 8,925 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 28,443 us-gaap_ProfitLoss / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember |  |  | 19,518 us-gaap_ProfitLoss / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 8,925 us-gaap_ProfitLoss / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income |  | 3,151 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 3,151 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 3,261 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember |  |  |  | 3,261 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Issuance of common stock (in shares) |  |  | 108,362 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 5,927 us-gaap_StockIssuedDuringPeriodValueNewIssues | 5,927 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (82,474)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (4,535)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (4,535)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  |
Stock-based compensation and other (in shares) |  |  |  | 146,590 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  |
Stock-based compensation and other |  | 8,007 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued |  | 7,999 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 8 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  | (2)us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember |  |  | (2)us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Ending balance at Mar. 31, 2014 |  | 4,377,701 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 2,497,485 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (844)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 1,801,047 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (74,902)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 154,915 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 4,486,576 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 178,162 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,379,696 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,823,914 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (50,111)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 154,915 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending balance (in shares) at Mar. 31, 2014 |  |  | 110,389,065 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 34,828 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 71,264,947 us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Beginning balance at Dec. 31, 2014 |  | 4,519,102 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 2,512,970 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (3,401)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 1,926,065 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (68,141)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 151,609 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 4,629,852 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 178,162 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,379,696 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,968,718 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (48,333)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 151,609 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Beginning balance (in shares) at Dec. 31, 2014 |  | 110,649,762 us-gaap_CommonStockSharesIssued | 110,649,762 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 78,400 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 71,264,947 us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 20,727 us-gaap_ProfitLoss |  |  | 16,122 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 4,605 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 24,473 us-gaap_ProfitLoss / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember |  |  | 19,868 us-gaap_ProfitLoss / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 4,605 us-gaap_ProfitLoss / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income |  | 1,759 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 1,759 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 1,857 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember |  |  |  | 1,857 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Issuance of common stock (in shares) |  |  | 159,730 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  | 10,277 us-gaap_StockIssuedDuringPeriodValueNewIssues | 10,277 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | [1] |  |  | (93,280)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  |
Purchase of treasury stock | [1] | (6,095)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (6,095)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  |
Stock-based compensation and other (in shares) |  |  |  | 109,896 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  |
Stock-based compensation and other |  | 7,237 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued |  | 7,230 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 7 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  | 1 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember |  |  | 1 us-gaap_StockholdersEquityOther / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Ending balance at Mar. 31, 2015 |  | $ 4,553,007 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 2,523,247 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (2,266)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 1,942,194 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (66,382)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 156,214 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 4,656,183 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | $ 178,162 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 2,379,696 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 1,988,587 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (46,476)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 156,214 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Ending balance (in shares) at Mar. 31, 2015 |  | 110,809,492 us-gaap_CommonStockSharesIssued | 110,809,492 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 61,784 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 71,264,947 us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
[1] | Primarily represents shares of common stock withheld from certain stock awards for tax purposes.

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