| **CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands** | 9 Months Ended |
|------------------------------------------------------------------------------------------|----------------|
||
| **CASH FLOWS FROM OPERATING ACTIVITIES**                                                 |           |   |
| NET INCOME                                                                               | $ 499,591      | $ 481,447 |
| **Adjustments to reconcile net income to net cash provided by operating activities:**    |           |   |
| Depreciation and amortization including nuclear fuel                                     | 489,861        | 445,707 |
| Deferred fuel and purchased power                                                        | (82,486)       | (43,348) |
| Deferred fuel and purchased power amortization                                           | 92,397         | (18,153) |
| Allowance for equity funds used during construction                                      | (39,411)       | (32,666) |
| Deferred income taxes                                                                    | 117,571        | 211,249 |
| Deferred investment tax credit                                                           | (7,397)        | (4,293) |
| Change in derivative instruments fair value                                              | 0              | (254) |
| Stock compensation                                                                       | 16,140         | 16,553 |
| **Changes in current assets and liabilities:**                                           |           |   |
| Customer and other receivables                                                           | (65,203)       | (206,920) |
| Accrued unbilled revenues                                                                | (83,939)       | (44,027) |
| Materials, supplies and fossil fuel                                                      | (20,591)       | (1,881) |
| Income tax receivable                                                                    | 0              | 3,751 |
| Other current assets                                                                     | 23,661         | (22,043) |
| Accounts payable                                                                         | (11,399)       | (24,258) |
| Accrued taxes                                                                            | 78,624         | 89,827 |
| Other current liabilities                                                                | 12,852         | 3,936 |
| Change in margin and collateral accounts — assets                                  | (588)          | (1,826) |
| Change in margin and collateral accounts — liabilities                             | (982)          | (1,625) |
| Change in unrecognized tax benefits                                                      | (1,235)        | 5,891 |
| Change in other long-term assets                                                         | 14,708         | (59,963) |
| Change in other long-term liabilities                                                    | (72,411)       | (25,180) |
| Net cash flow provided by operating activities                                           | 959,763        | 771,924 |
| **CASH FLOWS FROM INVESTING ACTIVITIES**                                                 |           |   |
| Capital expenditures                                                                     | (898,455)      | (1,027,753) |
| Contributions in aid of construction                                                     | 22,611         | 24,924 |
| Allowance for borrowed funds used during construction                                    | (18,959)       | (15,378) |
| Proceeds from nuclear decommissioning trust sales and other special use funds            | 443,215        | 351,860 |
| Investment in nuclear decommissioning trust and other special use funds                  | (461,777)      | (353,001) |
| Other                                                                                    | 49             | (20,291) |
| Net cash flow used for investing activities                                              | (913,316)      | (1,039,639) |
| **CASH FLOWS FROM FINANCING ACTIVITIES**                                                 |           |   |
| Issuance of long-term debt                                                               | 295,245        | 549,478 |
| Short-term borrowing and payments — net                                            | 19,800         | (68,800) |
| Short-term debt borrowings under revolving credit facility                               | 45,000         | 23,000 |
| Short-term debt repayments under revolving credit facility                               | (32,000)       | 0 |
| Repayment of long-term debt                                                              | (82,000)       | 0 |
| Dividends paid on common stock                                                           | (228,037)      | (213,927) |
| Common stock equity issuance - net of purchases                                          | (1,984)        | (8,870) |
| Distributions to noncontrolling interests                                                | (11,372)       | (11,372) |
| Other                                                                                    | 0              | (1) |
| Net cash flow provided by financing activities                                           | 4,652          | 269,508 |
| NET INCREASE IN CASH AND CASH EQUIVALENTS                                                | 51,099         | 1,793 |
| CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD                                         | 13,892         | 8,881 |
| CASH AND CASH EQUIVALENTS AT END OF PERIOD                                               | 64,991         | 10,674 |
| **Supplemental disclosure of cash flow information**                                     |           |   |
| Income taxes, net of refunds                                                             | 10,091         | 2,185 |
| Interest, net of amounts capitalized                                                     | 161,875        | 147,149 |
| **Significant non-cash investing and financing activities:**                             |           |   |
| Accrued capital expenditures                                                             | 99,405         | 93,031 |
| APS                                                                                      |           |   |
| **CASH FLOWS FROM OPERATING ACTIVITIES**                                                 |           |   |
| NET INCOME                                                                               | 540,409        | 491,143 |
| **Adjustments to reconcile net income to net cash provided by operating activities:**    |           |   |
| Depreciation and amortization including nuclear fuel                                     | 488,223        | 444,439 |
| Deferred fuel and purchased power                                                        | (82,486)       | (43,348) |
| Deferred fuel and purchased power amortization                                           | 92,397         | (18,153) |
| Allowance for equity funds used during construction                                      | (39,411)       | (32,666) |
| Deferred income taxes                                                                    | 86,319         | 202,256 |
| Deferred investment tax credit                                                           | (7,397)        | (4,293) |
| Change in derivative instruments fair value                                              | 0              | (254) |
| **Changes in current assets and liabilities:**                                           |           |   |
| Customer and other receivables                                                           | (56,874)       | (185,130) |
| Accrued unbilled revenues                                                                | (83,939)       | (44,027) |
| Materials, supplies and fossil fuel                                                      | (20,694)       | (1,755) |
| Income tax receivable                                                                    | 0              | 11,174 |
| Other current assets                                                                     | 20,258         | (19,100) |
| Accounts payable                                                                         | (8,857)        | (29,784) |
| Accrued taxes                                                                            | 106,172        | 102,638 |
| Other current liabilities                                                                | 9,289          | 11,747 |
| Change in margin and collateral accounts — assets                                  | (588)          | (1,826) |
| Change in margin and collateral accounts — liabilities                             | (982)          | (1,625) |
| Change in unrecognized tax benefits                                                      | (1,235)        | 5,891 |
| Change in other long-term assets                                                         | 25,993         | (56,375) |
| Change in other long-term liabilities                                                    | (78,678)       | (26,049) |
| Net cash flow provided by operating activities                                           | 987,919        | 804,903 |
| **CASH FLOWS FROM INVESTING ACTIVITIES**                                                 |           |   |
| Capital expenditures                                                                     | (889,347)      | (1,008,723) |
| Contributions in aid of construction                                                     | 22,611         | 24,924 |
| Allowance for borrowed funds used during construction                                    | (18,959)       | (15,378) |
| Proceeds from nuclear decommissioning trust sales and other special use funds            | 443,040        | 351,860 |
| Investment in nuclear decommissioning trust and other special use funds                  | (461,602)      | (353,001) |
| Other                                                                                    | (1,261)        | (18,098) |
| Net cash flow used for investing activities                                              | (905,518)      | (1,018,416) |
| **CASH FLOWS FROM FINANCING ACTIVITIES**                                                 |           |   |
| Issuance of long-term debt                                                               | 295,245        | 549,478 |
| Short-term borrowing and payments — net                                            | 0              | (103,700) |
| Short-term debt borrowings under revolving credit facility                               | 25,000         | 0 |
| Short-term debt repayments under revolving credit facility                               | (25,000)       | 0 |
| Repayment of long-term debt                                                              | (82,000)       | 0 |
| Dividends paid on common stock                                                           | (233,300)      | (219,100) |
| Distributions to noncontrolling interests                                                | (11,372)       | (11,372) |
| Net cash flow provided by financing activities                                           | (31,427)       | 215,306 |
| NET INCREASE IN CASH AND CASH EQUIVALENTS                                                | 50,974         | 1,793 |
| CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD                                         | 13,851         | 8,840 |
| CASH AND CASH EQUIVALENTS AT END OF PERIOD                                               | 64,825         | 10,633 |
| **Supplemental disclosure of cash flow information**                                     |           |   |
| Income taxes, net of refunds                                                             | 24,746         | 132 |
| Interest, net of amounts capitalized                                                     | 154,788        | 142,779 |
| **Significant non-cash investing and financing activities:**                             |           |   |
| Accrued capital expenditures                                                             | $ 99,405       | $ 94,769 |

| X                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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The aggregate net change during the reporting period in moneys received as security, collateral, or margin deposits.
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Payments to Acquire Investments to be Held in Decommissioning Trust Fund And Other Special Use Funds
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Cash inflow due to change during the period in the allowance for other funds used during construction classified as an investing activity.
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Future cash outflow to pay for purchases of fixed assets that have occurred.
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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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| - Definition
Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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| - Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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| - Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.
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| - Definition
The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.
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| - Definition
The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes.
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Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.
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| - Definition
The increase (decrease) during the reporting period in moneys or securities given as security including, but not limited to, contract, escrow, or earnest money deposits, retainage (if applicable), deposits with clearing organizations and others, collateral, or margin deposits.
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The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.
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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.
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The increase (decrease) during the reporting period in other expenses incurred but not yet paid.
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Amount of increase (decrease) in operating assets classified as other.
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Amount of increase (decrease) in operating liabilities classified as other.
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| - Definition
The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods.
+ References
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| - Definition
The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.
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| - Definition
The increase (decrease) during the reporting period in unrecovered fuel costs for a regulated utility company.
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| - Definition
Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.
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| - Definition
Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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| - Definition
Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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| - Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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| - References
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| - Definition
Amount of cash (inflow) outflow from investing activities classified as other.
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| - Definition
Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.
+ References
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| - Definition
The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.
+ References
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| - Definition
Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.
+ References
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| - Definition
The cash inflow from developers, builders, governmental agencies and municipalities that provide the entity with cash to extend its construction services to their properties.
+ References
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| - Definition
The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.
+ References
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| - Definition
Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) from financing activities classified as other.
+ References
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| - Definition
The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.
+ References
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| - Definition
The net cash inflow or outflow resulting from the entity's share transaction.
+ References
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| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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| - Definition
The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets.
+ References
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| - Definition
Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.
+ References
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| - Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.
+ References
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| - Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.
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| - References
No definition available.
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| - Definition
The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.
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| - Definition
Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.
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