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Regulatory Matters: Gas Utilities Regulatory Activity (Details) $ in Millions | Oct. 13, 2023 USD ($) mi | Jul. 12, 2023 USD ($) | May 09, 2023 USD ($) mi | Jan. 26, 2023 USD ($) | Jun. 01, 2022 mi
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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 - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi |  |  | 10,000 |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 27.0 |  |
Public utilities, requested equity capital structure, percentage |  |  | 51.00% |  |
Public utilities, requested debt capital structure, percentage |  |  | 49.00% |  |
Public Utilities, Requested Return on Equity, Percentage |  |  | 10.49% |  |
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Weighted average cost of capital |  | 6.93% |  |  |
Public Utilities Amount of System Safety and Integrity Rider Moved to Base Rates and Termination of the System Safety and Integrity Rider |  | $ 8.3 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  | $ 8.2 |  |  |
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency | Minimum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
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 |  | 9.50% |  |  |
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public Utilities, Approved Equity Capital Structure, Percentage |  | 52.00% |  |  |
Public Utilities, Approved Debt Capital Structure, Percentage |  | 48.00% |  |  |
Public Utilities, Approved Return on Equity, Percentage |  | 9.70% |  |  |
Wyoming Public Service Commission | Wyoming Electric | Settlement Reached with the Regulatory Agency |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments | mi |  |  |  |  | 1,330
Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments | mi |  |  |  |  | 59
Public Utilities, Approved Equity Capital Structure, Percentage |  |  |  | 52.00% |
Public Utilities, Approved Debt Capital Structure, Percentage |  |  |  | 48.00% |
Public Utilities, Approved Return on Equity, Percentage |  |  |  | 9.75% |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  | $ 8.7 |
Subsequent Event | Wyoming Public Service Commission | Black Hills Energy - Wyoming Gas | Settlement Agreement Filed with Regulatory Agency |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi | 6,400 |  |  |  |
Public utilities, requested equity capital structure, percentage | 51.00% |  |  |  |
Public utilities, requested debt capital structure, percentage | 49.00% |  |  |  |
Public Utilities, Requested Return on Equity, Percentage | 9.85% |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 13.9 |  |  |  |
Extension period as per settlement agreement | 4 years |  |  |  |

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