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Property Plant and Equipment Property Plant and Equipment | 12 Months Ended
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Dec. 31, 2024
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure | Major classes of property, plant and equipment
(Millions of Dollars) |  | Dec. 31, 2024 |  | Dec. 31, 2023
Property, plant and equipment, net |  |  |  |
Electric plant |  | $ | 56,791 |  |  | $ | 52,494 |
Natural gas plant |  | 9,834 |  |  | 9,080 |
Common and other property |  | 3,515 |  |  | 3,190 |
Plant to be retired (a) |  | 1,793 |  |  | 2,055 |
CWIP |  | 4,720 |  |  | 2,873 |
Total property, plant and equipment |  | 76,653 |  |  | 69,692 |
Less accumulated depreciation |  | (19,852) |  |  | (18,399) |
Nuclear fuel |  | 3,491 |  |  | 3,337 |
Less accumulated amortization |  | (3,094) |  |  | (2,988) |
Property, plant and equipment, net |  | $ | 57,198 |  |  | $ | 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 for SPS. The Dec. 31, 2023 amounts also include coal generation assets at Harrington, which were retired in 2024 and the conversion to natural gas is in process. Amounts are presented net of accumulated depreciation. Joint Ownership of Generation, Transmission and Gas Facilities The utility subsidiaries’ jointly owned assets as of Dec. 31, 2024:
(Millions of Dollars, Except Percent Owned) |  | Plant in Service |  | Accumulated Depreciation |  |  |  | Percent Owned
NSP-Minnesota |  |  |  |  |  |  |  |
Electric generation: |  |  |  |  |  |  |  |
Sherco Unit 3 |  | $ | 636 |  |  | $ | 499 |  |  |  |  | 59 | %
Sherco common facilities |  | 189 |  |  | 128 |  |  |  |  | 80 |
Sherco substation |  | 5 |  |  | 4 |  |  |  |  | 59 |
Electric transmission: |  |  |  |  |  |  |  |
Grand Meadow |  | 11 |  |  | 4 |  |  |  |  | 50 |
Huntley Wilmarth |  | 49 |  |  | 3 |  |  |  |  | 50 |
CapX2020 |  | 855 |  |  | 160 |  |  |  |  | 51 |
Total NSP-Minnesota (a) |  | $ | 1,745 |  |  | $ | 798 |  |  |  |  |
(a)Projects additionally include $10 million in CWIP.
(Millions of Dollars, Except Percent Owned) |  | Plant in Service |  | Accumulated Depreciation |  |  |  | Percent Owned
NSP-Wisconsin |  |  |  |  |  |  |  |
Electric transmission: |  |  |  |  |  |  |  |
La Crosse, WI to Madison, WI |  | $ | 179 |  |  | $ | 30 |  |  |  |  | 37 | %
CapX2020 |  | 169 |  |  | 44 |  |  |  |  | 80 |
Total NSP-Wisconsin (a) |  | $ | 348 |  |  | $ | 74 |  |  |  |  |
(a)Projects additionally include $1 million in CWIP.
(Millions of Dollars, Except Percent Owned) |  | Plant in Service |  | Accumulated Depreciation |  |  |  | Percent Owned
PSCo |  |  |  |  |  |  |  |
Electric generation: |  |  |  |  |  |  |  |
Hayden Unit 1 |  | $ | 158 |  |  | $ | 117 |  |  |  |  | 76 | %
Hayden Unit 2 |  | 152 |  |  | 93 |  |  |  |  | 37 |
Hayden common facilities |  | 45 |  |  | 33 |  |  |  |  | 53 |
Craig Units 1 and 2 |  | 82 |  |  | 58 |  |  |  |  | 10 |
Craig common facilities |  | 40 |  |  | 27 |  |  |  |  | 7 |
Comanche Unit 3 |  | 933 |  |  | 212 |  |  |  |  | 67 |
Comanche common facilities |  | 29 |  |  | 5 |  |  |  |  | 77 |
Electric transmission: |  |  |  |  |  |  |  |
Transmission and other facilities |  | 190 |  |  | 75 |  |  |  |  | Various
Gas transmission: |  |  |  |  |  |  |  |
Rifle, CO to Avon, CO |  | 28 |  |  | 10 |  |  |  |  | 60 |
Gas transmission compressor |  | 8 |  |  | 3 |  |  |  |  | 50 |
Total PSCo (a) |  | $ | 1,665 |  |  | $ | 633 |  |  |  |  |
(a)Projects additionally include $28 million in CWIP. Each company separately records its share of operating expenses and construction expenditures. Respective owners are responsible for providing their own financing.

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