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Property Plant and Equipment Property Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2024
Property, Plant and Equipment [Line Items] |
Public Utility Property, Plant, and Equipment | 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.
NSP Minnesota |
Property, Plant and Equipment [Line Items] |
Schedule of Jointly Owned Utility Plants |
(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.
NSP-Wisconsin |
Property, Plant and Equipment [Line Items] |
Schedule of Jointly Owned Utility Plants |
(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.
PSCo |
Property, Plant and Equipment [Line Items] |
Schedule of Jointly Owned Utility Plants |
(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.

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- Definition Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation expense and method used, including composite depreciation, and accumulated depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481834/980-20-45-1 + Details
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