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Selected Balance Sheet Data | 9 Months Ended
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Sep. 30, 2025
Balance Sheet Related Disclosures [Abstract] |
Selected Balance Sheet Data |
(Millions of Dollars) |  | Sept. 30, 2025 |  | Dec. 31, 2024
Accounts receivable, net |  |  |  |
Accounts receivable |  | $ | 1,341 |  |  | $ | 1,360 |
Less allowance for bad debts |  | (95) |  |  | (111) |
Accounts receivable, net |  | $ | 1,246 |  |  | $ | 1,249 |
(Millions of Dollars) |  | Sept. 30, 2025 |  | Dec. 31, 2024
Inventories |  |  |  |
Materials and supplies |  | $ | 461 |  |  | $ | 406 |
Fuel |  | 145 |  |  | 164 |
Natural gas |  | 117 |  |  | 96 |
Total inventories |  | $ | 723 |  |  | $ | 666 |
(Millions of Dollars) |  | Sept. 30, 2025 |  | Dec. 31, 2024
Property, plant and equipment, net |  |  |  |
Electric plant |  | $ | 59,976 |  |  | $ | 56,791 |
Natural gas plant |  | 10,300 |  |  | 9,834 |
Common and other property |  | 3,702 |  |  | 3,515 |
Plant to be retired (a) |  | 1,640 |  |  | 1,793 |
Construction work in progress |  | 8,017 |  |  | 4,720 |
Total property, plant and equipment |  | 83,635 |  |  | 76,653 |
Less accumulated depreciation |  | (20,957) |  |  | (19,852) |
Nuclear fuel |  | 3,634 |  |  | 3,491 |
Less accumulated amortization |  | (3,181) |  |  | (3,094) |
Property, plant and equipment, net |  | $ | 63,131 |  |  | $ | 57,198 |
(a)Amounts include Sherco 1 and 3 and A.S. King for NSP-Minnesota; Comanche Units 2 and 3, Craig Units 1 and 2, Hayden Units 1 and 2 and coal generation assets at Pawnee pending facility gas conversion for PSCo; and Tolk Unit 1 and 2 for SPS. Amounts are presented net of accumulated depreciation.

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- References No definition available. + Details
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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/210/tableOfContent + Details
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