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Jointly Owned Facilities | 12 Months Ended
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Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Jointly Owned Facilities | (6) JOINTLY OWNED FACILITIES Our consolidated financial statements include our share of several jointly-owned facilities as described below. Our share of the facilities’ expenses is reflected in the appropriate categories of operating expenses in the Consolidated Statements of Income. Each owner of the facility is responsible for financing its investment in the jointly-owned facilities. 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 |
(a) In addition to supplying South Dakota Electric with coal for its share of the Wyodak Plant, our mine supplies PacifiCorp’s share of the coal under a separate long-term agreement through December 31, 2026, with an annual renewal option for one-year extensions. This coal supply agreement is collateralized by a mortgage on and a security interest in some of WRDC’s coal reserves. (b) South Dakota Electric retains responsibility for plant operations. WRDC supplies fuel to Wygen III for the life of the plant. (c) Black Hills Wyoming retains responsibility for plant operations. WRDC supplies fuel to Wygen I for the life of the plant.

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- Definition Disclosure of proportionate interests in jointly owned facilities (regulated utiliyt and non-regulated). Includes the amount of plants in service, the accumulated depreciation (if available), the amount of construction in progress, and the proportionate share. Includes statements that the amounts represent the company's share in each joint facility and that it must provide its own financing. 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, fuel, maintenance, other operating expense). [Text Block] + References No definition available. + Details
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