XML 32 R16.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Jointly Owned Facilities: | 12 Months Ended
--- | ---
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Jointly Owned Facilities | JOINTLY OWNED FACILITIES Our consolidated financial statements include our share of several jointly-owned facilities as described below. Our share of the facilities’ expenses are 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. Wyodak Plant South Dakota Electric owns a 20% interest in the Wyodak Plant while PacifiCorp owns the remaining ownership interest and operates the Wyodak Plant. South Dakota Electric receives its proportionate share of the Wyodak Plant’s capacity and is committed to pay its proportionate share of its additions, replacements and operating and maintenance expenses. 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. This coal supply agreement is collateralized by a mortgage on and a security interest in some of WRDC’s coal reserves. Transmission Tie South Dakota Electric owns a 35% interest in, and is the operator of, the Converter Station Site and South Rapid City Interconnection (the Transmission Tie), an AC-DC-AC transmission tie. Basin Electric Power Cooperative owns the remaining 65% interest in the Transmission Tie. South Dakota Electric is committed to pay its proportionate share of the additions and replacements and operating and maintenance expenses of the Transmission Tie. Wygen III South Dakota Electric owns 52% of the Wygen III generation facility. MDU and the City of Gillette each own an undivided ownership interest in Wygen III and are obligated to make payments for costs associated with administrative services and their proportionate share of the costs of operating the plant for the life of the facility. South Dakota Electric retains responsibility for plant operations. Our mine supplies fuel to Wygen III for the life of the plant. Wygen I Black Hills Wyoming owns 76.5% of the Wygen I plant while MEAN owns the remaining ownership interest. MEAN is obligated to make payments for its share of the costs associated with administrative services, plant operations and coal supply provided by our mine during the life of the facility. Black Hills Wyoming retains responsibility for plant operations. At December 31, 2021, our interests in jointly-owned generating facilities and transmission systems were (in thousands):
| Plant in Service | Construction Work in Progress | Less Accumulated Depreciation | Plant Net of Accumulated Depreciation
Wyodak Plant | $ | 118,637 |  | $ | 882 |  | $ | (70,468) |  | $ | 49,051 |
Transmission Tie | $ | 24,544 |  | $ | 287 |  | $ | (6,922) |  | $ | 17,909 |
Wygen III | $ | 142,199 |  | $ | 635 |  | $ | (26,598) |  | $ | 116,236 |
Wygen I | $ | 120,565 |  | $ | 399 |  | $ | (53,784) |  | $ | 67,180 |
Jointly Owned Facilities - Related Party Busch Ranch I Colorado Electric owns 50% of Busch Ranch I while Black Hills Electric Generation owns the remaining 50% ownership interest. Each company is obligated to make payments for costs associated with their proportionate share of the costs of operating the wind farm over the life of the facility. Colorado Electric retains responsibility for operations of the wind farm. Black Hills Electric Generation provides its share of energy from the wind farm to Colorado Electric through a PPA, which expires in October 2037. Cheyenne Prairie Cheyenne Prairie serves the utility customers of South Dakota Electric and Wyoming Electric. The facility includes one simple-cycle, 40 MW combustion turbine that is wholly-owned by Wyoming Electric and one combined-cycle, 100 MW unit that is jointly-owned by South Dakota Electric (58 MW) and Wyoming Electric (42 MW). BHSC is responsible for plant operations. Corriedale Corriedale serves as the dedicated wind energy supply for Renewable Ready customers in South Dakota and Wyoming. The 52.5 MW wind farm is jointly-owned by South Dakota Electric (32.5 MW) and Wyoming Electric (20 MW). BHSC is responsible for operations of the wind farm.

X
- 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
Name: | bkh_JointlyOwnedFacilitiesUtilityandNonRegulatedTextBlock
Namespace Prefix: | bkh_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration