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Jointly Owned Facilities (Tables) | 12 Months Ended
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Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Jointly Owned Utility Plants | At December 31, 2023, our interests in jointly-owned generating facilities and transmission systems were (in millions):
| Ownership Interest |  | Plant in Service |  | Construction Work in Progress |  | Less Accumulated Depreciation |  | Plant Net of Accumulated Depreciation |
Wyodak Plant (a) |  | 20 | % | $ | 122.3 |  | $ | — |  | $ | (73.4 | ) | $ | 48.9 |
Transmission Tie |  | 35 | % | $ | 24.5 |  | $ | 0.3 |  | $ | (7.8 | ) | $ | 17.0 |
Wygen III (b) |  | 52 | % | $ | 145.3 |  | $ | 0.3 |  | $ | (32.2 | ) | $ | 113.4 |
Wygen I (c) |  | 76.5 | % | $ | 116.0 |  | $ | 0.8 |  | $ | (60.1 | ) | $ | 56.7 |

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- Definition Tabular disclosure of proportionate interests in jointly owned plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of facilities under construction, and the proportionate share. Includes statements that the amounts represent the company's share in each joint plant and that it must provide its own financing. Information concerning two or more plants on the same site may be combined. States that the company's share of direct expenses of the joint facilities is included in the corresponding operating expenses on its income statement (for example, maintenance and other operating expense). This schedule includes both Utility and non-Utility facilities. [Table Text Block] + References No definition available. + Details
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