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REGULATORY MATTERS: Regulatory Requests (Details) - USD ($) $ in Thousands | Jun. 01, 2022 | Dec. 31, 2023 | Dec. 31, 2022
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Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets |  | $ 1,653,050 | $ 1,501,961
IDAHO | Jim Bridger Plant |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 2.10% |  |
Approved Rate Increase (Decrease), Percentage | 1.50% |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount | $ 27,100 |  |
Approved Rate Increase (Decrease), Amount | $ 18,800 |  |

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