| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 3.84a | 4.96a |
| Customer and other receivables | 525.61a | 513.89a |
| Accrued unbilled revenues | 176.9a | 167.55a |
| Allowance for doubtful accounts | -24.85a | -22.43a |
| Materials and supplies (at average cost) | 469.02a | 444.34a |
| Income tax receivable | | 0.33a |
| Fossil fuel (at average cost) | 32.42a | 49.2a |
| Assets from risk management activities | 10.58a | 6.81a |
| Assets held for sale | | 35.14a |
| Deferred fuel and purchased power regulatory asset | 287.6a | 463.2a |
| Other regulatory assets | 133.37a | 162.56a |
| Other current assets | 74.92a | 101.42a |
| Total current assets | 1,689.4a | 1,926.97a |
| Investments and other assets | — | — |
| Nuclear decommissioning trusts | 1,282.85a | 1,201.25a |
| Other special use funds | 408.36a | 362.78a |
| Assets from risk management activities | 5.98a | |
| Other assets | 115.1a | 102.85a |
| Total investments and other assets | 1,812.28a | 1,666.87a |
| Property, plant and equipment | — | — |
| Plant in service and held for future use | 25,860.95a | 24,211.17a |
| Accumulated depreciation and amortization | -9,027.43a | -8,408.04a |
| Net | 16,833.52a | 15,803.13a |
| Construction work in progress | 1,592.66a | 1,724a |
| Palo Verde sale leaseback, net of accumulated depreciation of $268,894 and $264,624 | 82.56a | 86.43a |
| Intangible assets, net of accumulated amortization of $925,880 and $885,505 | 591.31a | 267.11a |
| Nuclear fuel, net of accumulated amortization of $115,894 and $118,074 | 97.85a | 99.49a |
| Total property, plant and equipment | 19,197.9a | 17,980.16a |
| Deferred debits | — | — |
| Regulatory assets | 1,389.49a | 1,390.28a |
| Operating lease right-of-use assets | 1,605.46a | 1,309.98a |
| Assets for pension and other postretirement benefits | 342.1a | 323.44a |
| Other | 66.13a | 63.47a |
| Total deferred debits | 3,403.18a | 3,087.16a |
| Total assets | 26,102.76a | 24,661.15a |
| Liabilities and equity | — | — |
| Current liabilities | — | — |
| Accounts payable | 485.43a | 442.46a |
| Accrued taxes | 175.86a | 166.83a |
| Accrued interest | 81.8a | 72.92a |
| Common dividends payable | 106.59a | 99.81a |
| Short-term borrowings | 568.45a | 609.5a |
| Current maturities of long-term debt | 800a | 875a |
| Customer deposits | 44.35a | 42.04a |
| Liabilities from risk management activities | 52.34a | 80.91a |
| Liabilities for asset retirements | 50.01a | 28.55a |
| Operating lease liabilities | 100.37a | 67.88a |
| Regulatory liabilities | 206.96a | 209.92a |
| Other current liabilities | 171.65a | 193.52a |
| Total current liabilities | 2,843.8a | 2,889.35a |
| Long-term debt less current maturities | 8,058.65a | 7,540.62a |
| Deferred credits and other | — | — |
| Deferred income taxes | 2,444.47a | 2,416.48a |
| Regulatory liabilities | 1,855.28a | 1,965.87a |
| Liabilities for asset retirements | 1,096.58a | 937.45a |
| Liabilities for pension benefits | 139.32a | 112.7a |
| Liabilities from risk management activities | 9.45a | 42.98a |
| Customer advances | 569.34a | 533.58a |
| Coal mine reclamation | 171.48a | 184.01a |
| Deferred investment tax credit | 249.49a | 257.74a |
| Unrecognized tax benefits | 44.23a | 33.86a |
| Operating lease liabilities | 1,520.88a | 1,210.19a |
| Other | 242.32a | 251.47a |
| Total deferred credits and other | 8,342.84a | 7,946.32a |
| Equity | — | — |
| Common stock | 3,121.62a | 2,752.68a |
| Treasury stock | -3.32a | -8.19a |
| Total common stock | 3,118.29a | 2,744.49a |
| Retained earnings | 3,666.96a | 3,466.32a |
| Accumulated other comprehensive loss | -30.94a | -33.14a |
| Total shareholders’ equity | 6,754.31a | 6,177.66a |
| Noncontrolling interests | 103.17a | 107.2a |
| Total equity | 6,857.48a | 6,284.86a |
| Total liabilities and equity | 26,102.76a | 24,661.15a |