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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Cash Flows (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 21, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 30,949,000 | $ 319,885,000 | $ 171,612,000 | $ 8,094,000 | $ 26,502,000 | $ 280,945,000 | $ 172,317,000 | $ 28,185,000 | $ 530,540,000 | $ 507,949,000 | $ 461,527,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 650,955,000 | 610,629,000 | 565,011,000
Deferred income taxes |  |  |  |  |  |  |  |  |  | 117,355,000 | 248,164,000 | 206,870,000
Accounts receivable |  |  |  |  |  |  |  |  |  | 37,530,000 | (93,797,000) | (2,489,000)
Accounts payable |  |  |  |  |  |  |  |  |  | (14,602,000) | (23,769,000) | (66,917,000)
Net cash flow provided by operating activities |  |  |  |  |  |  |  |  |  | 1,277,144,000 | 1,118,036,000 | 1,023,390,000
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |
Net cash flow used for investing activities |  |  |  |  |  |  |  |  |  | (1,192,824,000) | (1,428,537,000) | (1,252,078,000)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |
Issuance of long-term debt |  |  |  |  |  |  |  |  |  | 445,245,000 | 848,239,000 | 693,151,000
Short-term debt borrowings under revolving credit facility |  |  |  |  |  |  |  |  |  | 45,000,000 | 58,000,000 | 40,000,000
Short-term debt repayments under revolving credit facility |  |  |  |  |  |  |  |  |  | (57,000,000) | (32,000,000) | 0
Dividends paid on common stock |  |  |  |  |  |  |  |  |  | (308,892,000) | (289,793,000) | (274,229,000)
Repayment of long-term debt |  |  |  |  |  |  |  |  |  | (182,000,000) | (125,000,000) | (370,430,000)
Common stock equity issuance and purchases - net |  |  |  |  |  |  |  |  |  | (5,055,000) | (13,390,000) | (4,867,000)
Net cash flow (used for) provided by financing activities |  |  |  |  |  |  |  |  |  | (92,446,000) | 315,512,000 | 198,081,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  |  | (8,126,000) | 5,011,000 | (30,607,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  |  | 13,892,000 |  |  |  | 8,881,000 | 13,892,000 | 8,881,000 | 39,488,000
CASH AND CASH EQUIVALENTS AT END OF YEAR |  | 5,766,000 |  |  |  | 13,892,000 |  |  |  | 5,766,000 | 13,892,000 | 8,881,000
Pinnacle West |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 511,047,000 | 488,456,000 | 442,034,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries - net |  |  |  |  |  |  |  |  |  | (569,249,000) | (507,495,000) | (462,027,000)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 76,000 | 76,000 | 85,000
Deferred income taxes |  |  |  |  |  |  |  |  |  | 49,535,000 | (264,000) | (12,402,000)
Accounts receivable |  |  |  |  |  |  |  |  |  | (7,881,000) | (2,106,000) | 15,823,000
Accounts payable |  |  |  |  |  |  |  |  |  | 1,967,000 | (11,162,000) | 10,402,000
Accrued taxes and income tax receivable - net |  |  |  |  |  |  |  |  |  | (13,535,000) | (22,247,000) | 20,041,000
Dividends received from subsidiaries |  |  |  |  |  |  |  |  |  | 316,000,000 | 296,800,000 | 239,300,000
Other |  |  |  |  |  |  |  |  |  | 31,807,000 | 15,092,000 | 5,514,000
Net cash flow provided by operating activities |  |  |  |  |  |  |  |  |  | 319,767,000 | 257,150,000 | 258,770,000
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |  |
Construction work in progress |  |  |  |  |  |  |  |  |  | 0 | 0 | (18,457,000)
Investments in subsidiaries | $ (150,000,000) |  |  |  |  |  |  |  |  | (142,796,000) | (178,027,000) | (19,242,000)
Repayments of loans from subsidiaries |  |  |  |  |  |  |  |  |  | 6,477,000 | 2,987,000 | 1,026,000
Advances of loans to subsidiaries |  |  |  |  |  |  |  |  |  | (500,000) | (6,388,000) | (2,092,000)
Net cash flow used for investing activities |  |  |  |  |  |  |  |  |  | (136,819,000) | (181,428,000) | (38,765,000)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |  |
Issuance of long-term debt |  |  |  |  |  |  |  |  |  | 150,000,000 | 298,761,000 | 0
Short-term debt borrowings under revolving credit facility |  |  |  |  |  |  |  |  |  | 20,000,000 | 58,000,000 | 40,000,000
Short-term debt repayments under revolving credit facility |  |  |  |  |  |  |  |  |  | (32,000,000) | (32,000,000) | 0
Commercial paper - net |  |  |  |  |  |  |  |  |  | (7,000,000) | 27,700,000 | 1,700,000
Dividends paid on common stock |  |  |  |  |  |  |  |  |  | (308,892,000) | (289,793,000) | (274,229,000)
Repayment of long-term debt |  |  |  |  |  |  |  |  |  | 0 | (125,000,000) | 0
Common stock equity issuance and purchases - net |  |  |  |  |  |  |  |  |  | (5,055,000) | (13,390,000) | (4,867,000)
Other |  |  |  |  |  |  |  |  |  | (1,000) | 0 | 0
Net cash flow (used for) provided by financing activities |  |  |  |  |  |  |  |  |  | (182,948,000) | (75,722,000) | (237,396,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  |  | 0 | 0 | (17,391,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  |  | $ 41,000 |  |  |  | $ 41,000 | 41,000 | 41,000 | 17,432,000
CASH AND CASH EQUIVALENTS AT END OF YEAR |  | $ 41,000 |  |  |  | $ 41,000 |  |  |  | $ 41,000 | $ 41,000 | $ 41,000

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