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Selected Balance Sheet Data | 3 Months Ended
--- | ---
Mar. 31, 2024
Balance Sheet Related Disclosures [Abstract] |
Selected Balance Sheet Data |
(Millions of Dollars) |  | March 31, 2024 |  | Dec. 31, 2023
Accounts receivable, net |  |  |  |
Accounts receivable |  | $ | 1,339 |  |  | $ | 1,443 |
Less allowance for bad debts |  | (119) |  |  | (128) |
Accounts receivable, net |  | $ | 1,220 |  |  | $ | 1,315 |
(Millions of Dollars) |  | March 31, 2024 |  | Dec. 31, 2023
Inventories |  |  |  |
Materials and supplies |  | $ | 384 |  |  | $ | 377 |
Fuel |  | 192 |  |  | 211 |
Natural gas |  | 47 |  |  | 123 |
Total inventories |  | $ | 623 |  |  | $ | 711 |
(Millions of Dollars) |  | March 31, 2024 |  | Dec. 31, 2023
Property, plant and equipment, net |  |  |  |
Electric plant |  | $ | 52,982 |  |  | $ | 52,494 |
Natural gas plant |  | 9,198 |  |  | 9,080 |
Common and other property |  | 3,216 |  |  | 3,190 |
Plant to be retired (a) |  | 1,996 |  |  | 2,055 |
Construction work in progress |  | 3,773 |  |  | 2,873 |
Total property, plant and equipment |  | 71,165 |  |  | 69,692 |
Less accumulated depreciation |  | (18,771) |  |  | (18,399) |
Nuclear fuel |  | 3,379 |  |  | 3,337 |
Less accumulated amortization |  | (3,008) |  |  | (2,988) |
Property, plant and equipment, net |  | $ | 52,765 |  |  | $ | 51,642 |
(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 and coal generation assets at Harrington pending facility gas conversion for SPS. Amounts are presented net of accumulated depreciation.

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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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