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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 58,119 | $ 267,900 | $ 126,182 | $ 9,326 | $ 45,978 | $ 261,978 | $ 127,507 | $ 20,727 | $ 461,527 | $ 456,190 | $ 423,696
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 565,011 | 571,664 | 496,487
Deferred income taxes |  |  |  |  |  |  |  |  | 206,870 | 236,819 | 159,023
Accounts receivable |  |  |  |  |  |  |  |  | (2,489) | (22,219) | (52,672)
Accounts payable |  |  |  |  |  |  |  |  | (66,917) | (34,266) | (353)
Net cash flow provided by operating activities |  |  |  |  |  |  |  |  | 1,023,390 | 1,094,327 | 1,099,627
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Net cash flow used for investing activities |  |  |  |  |  |  |  |  | (1,252,078) | (1,066,233) | (922,668)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Issuance of long-term debt |  |  |  |  |  |  |  |  | 693,151 | 842,415 | 731,126
Short-term debt borrowings under revolving credit facility |  |  |  |  |  |  |  |  | 40,000 | 0 | 0
Dividends paid on common stock |  |  |  |  |  |  |  |  | (274,229) | (260,027) | (246,671)
Repayment of long-term debt |  |  |  |  |  |  |  |  | (370,430) | (415,570) | (652,578)
Common stock equity issuance and purchases - net |  |  |  |  |  |  |  |  | (4,867) | 19,373 | 15,288
Other |  |  |  |  |  |  |  |  | 0 | 1 | 161
Net cash flow provided by (used for) financing activities |  |  |  |  |  |  |  |  | 198,081 | 3,790 | (178,881)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | (30,607) | 31,884 | (1,922)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | 39,488 |  |  |  | 7,604 | 39,488 | 7,604 | 9,526
CASH AND CASH EQUIVALENTS AT END OF YEAR | 8,881 |  |  |  | 39,488 |  |  |  | 8,881 | 39,488 | 7,604
Pinnacle West |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 442,034 | 437,257 | 397,595
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries - net |  |  |  |  |  |  |  |  | (462,027) | (446,508) | (411,528)
Depreciation and amortization |  |  |  |  |  |  |  |  | 85 | 92 | 94
Deferred income taxes |  |  |  |  |  |  |  |  | (12,402) | 12,967 | 4,406
Accounts receivable |  |  |  |  |  |  |  |  | 15,823 | 11,336 | (22,945)
Accounts payable |  |  |  |  |  |  |  |  | 10,402 | 637 | 2,017
Accrued taxes and income tax receivable - net |  |  |  |  |  |  |  |  | 20,041 | (12,882) | (1,795)
Dividends received from subsidiaries |  |  |  |  |  |  |  |  | 239,300 | 266,900 | 253,600
Other |  |  |  |  |  |  |  |  | 5,514 | (6,995) | 18,432
Net cash flow provided by operating activities |  |  |  |  |  |  |  |  | 258,770 | 262,804 | 239,876
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Construction work in progress |  |  |  |  |  |  |  |  | (18,457) | (3,462) | 0
Investments in subsidiaries |  |  |  |  |  |  |  |  | (19,242) | (3,491) | (10,236)
Repayments of loans from subsidiaries |  |  |  |  |  |  |  |  | 1,026 | 157 | 322
Advances of loans to subsidiaries |  |  |  |  |  |  |  |  | (2,092) | (1,010) | (1,450)
Net cash flow used for investing activities |  |  |  |  |  |  |  |  | (38,765) | (7,806) | (11,364)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Issuance of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | 125,000
Short-term debt borrowings under revolving credit facility |  |  |  |  |  |  |  |  | 40,000 | 0 | 0
Commercial Paper - net |  |  |  |  |  |  |  |  | 1,700 | 0 | 0
Dividends paid on common stock |  |  |  |  |  |  |  |  | (274,229) | (260,027) | (246,671)
Repayment of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | (125,000)
Common stock equity issuance and purchases - net |  |  |  |  |  |  |  |  | (4,867) | 19,373 | 15,288
Other |  |  |  |  |  |  |  |  | 0 | 0 | 161
Net cash flow provided by (used for) financing activities |  |  |  |  |  |  |  |  | (237,396) | (240,654) | (231,222)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | (17,391) | 14,344 | (2,710)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | $ 17,432 |  |  |  | $ 3,088 | 17,432 | 3,088 | 5,798
CASH AND CASH EQUIVALENTS AT END OF YEAR | $ 41 |  |  |  | $ 17,432 |  |  |  | $ 41 | $ 17,432 | $ 3,088

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