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Regulatory Matters: Gas Utilities Regulatory Activity (Details) $ in Thousands | Dec. 31, 2021 USD ($) mi | Dec. 30, 2021 mi | Dec. 28, 2021 USD ($) | Dec. 10, 2021 USD ($) mi | Oct. 08, 2021 USD ($) | Jul. 06, 2021 | Mar. 01, 2021 USD ($) mi | Sep. 11, 2020 | Jun. 01, 2021 mi
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Arkansas Public Service Commission (APSC) | Black Hills Energy - Arkansas Gas | Rate Review Filed with the Regulatory Agency |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi |  |  |  | 7,200 |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  | $ 22,000 |  |  |  |  |
Public Utilities, Approved Equity Capital Structure, Percentage |  |  |  | 50.90% |  |  |  |  |
Public Utilities, Approved Debt Capital Structure, Percentage |  |  |  | 49.10% |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  | 10.20% |  |  |  |  |
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Gas | Rate Review Filed with the Regulatory Agency |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Public Utilities, Requested Term Extension of System Safety and Integrity Rider |  |  |  |  |  |  |  | 5 years |
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Gas | Settlement agreement reached with CPUC Staff and various intervenors, subject to the review and approval by an Administrative Law Judge and the CPUC. |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi | 7,000 |  |  |  |  |  |  |  |
Public Utilities, Approved Equity Capital Structure, Percentage | 50.30% |  |  |  |  |  |  |  |
Public Utilities, Approved Debt Capital Structure, Percentage | 49.70% |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.20% |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 6,500 |  |  |  |  |  |  |  |
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Gas | Rate Review Approved by Regulatory Agency |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Public Utilities, Term Extension of System Safety and Integrity Rider |  |  |  |  |  | 3 years |  |  |
Iowa Utilities Board (IUB) | Black Hills Energy - Iowa Gas | Settlement Reached with the Regulatory Agency |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi |  |  |  |  |  |  |  |  | 5,000
Public Utilities, Approved Equity Capital Structure, Percentage |  |  | 50.00% |  |  |  |  |  |
Public Utilities, Approved Debt Capital Structure, Percentage |  |  | 50.00% |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  | 9.60% |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | $ 3,700 |  |  |  |  |  |
Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates |  |  | $ 2,200 |  |  |  |  |  |
Kansas Corporation Commission (KCC) | Black Hills Energy, Kansas Gas | Global Settlement agreement with KCC Staff and various intervenors for a general rate increase and renewal of its safety and integrity rider. |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi |  | 4,600 |  |  |  |  |  |  |
Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates |  |  |  |  | $ 6,600 |  |  |  |
Public Utilities, Term Extension of System Safety and Integrity Rider |  | 5 years |  |  |  |  |  |  |
Nebraska Publc Service Commission (NPSC) | Black Hills Energy - Nebraska Gas | Settlement Reached with the Regulatory Agency |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi |  |  |  |  |  |  | 13,000 |  |
Public Utilities, Approved Equity Capital Structure, Percentage |  |  |  |  |  |  | 50.00% |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  |  |  |  | 9.50% |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  | $ 6,500 |  |
Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates |  |  |  |  |  |  | $ 4,600 |  |
Public Utilities, Term Extension of System Saftey and Integrity Rider |  |  |  |  |  |  | 5 years |  |

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