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Selected Balance Sheet Data
 3 Months Ended
Mar. 31, 2025
Balance Sheet Related Disclosures [Abstract]  
Selected Balance Sheet Data
(Millions of Dollars)March 31, 2025Dec. 31, 2024
Accounts receivable, net
Accounts receivable$1,394 $1,360 
Less allowance for bad debts(107)(111)
Accounts receivable, net$1,287 $1,249 
(Millions of Dollars)March 31, 2025Dec. 31, 2024
Inventories
Materials and supplies$426 $406 
Fuel149 164 
Natural gas50 96 
Total inventories$625 $666 
(Millions of Dollars)March 31, 2025Dec. 31, 2024
Property, plant and equipment, net
Electric plant$57,386 $56,791 
Natural gas plant9,951 9,834 
Common and other property3,559 3,515 
Plant to be retired (a)
1,730 1,793 
Construction work in progress5,956 4,720 
Total property, plant and equipment78,582 76,653 
Less accumulated depreciation(20,249)(19,852)
Nuclear fuel3,598 3,491 
Less accumulated amortization(3,124)(3,094)
Property, plant and equipment, net$58,807 $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.