| Selected Balance Sheet Data |
| | | | | | | | | | | | | | | | (Millions of Dollars) | | June 30, 2026 | | Dec. 31, 2025 | | Accounts receivable, net | | | | | | Accounts receivable | | $ | 457 | | | $ | 518 | | | Less allowance for bad debts | | (34) | | | (38) | | | Accounts receivable, net | | $ | 423 | | | $ | 480 | |
| | | | | | | | | | | | | | | | (Millions of Dollars) | | June 30, 2026 | | Dec. 31, 2025 | | Inventories | | | | | | Materials and supplies | | $ | 168 | | | $ | 136 | | | Fuel | | 64 | | | 64 | | | Natural gas | | 31 | | | 77 | | | Total inventories | | $ | 263 | | | $ | 277 | |
| | | | | | | | | | | | | | | | (Millions of Dollars) | | June 30, 2026 | | Dec. 31, 2025 | | Property, plant and equipment, net | | | | | | Electric plant | | $ | 21,589 | | | $ | 20,451 | | | Natural gas plant | | 7,409 | | | 7,222 | | | Common and other property | | 1,734 | | | 1,704 | | Plant to be retired (a) | | 894 | | | 929 | | | Construction work in progress | | 5,854 | | | 4,367 | | | Total property, plant and equipment | | 37,480 | | | 34,673 | | | Less accumulated depreciation | | (7,320) | | | (6,851) | | | Property, plant and equipment, net | | $ | 30,160 | | | $ | 27,822 | |
|