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REVENUES: Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | $ 1,639,612 | $ 1,557,974 | $ 1,382,653
Regulatory Liabilities |  | (882,553) | (860,601) |
Regulatory Assets |  | 1,653,050 | 1,501,961 |
Retail revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 1,472,666 | 1,372,758 | 1,252,335
Idaho Fixed Cost Adjustment [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | [1] | (38,571) | (23,517) | (36,242)
Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 29,791 | 28,490 | 27,804
Wholesale energy sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 63,421 | 66,519 | 40,839
Transmission services (wheeling) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 80,357 | 80,527 | 67,997
Energy efficiency program revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 31,948 | 33,197 | 29,920
Residential Retail Revenue | Retail revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 684,649 | 645,236 | 583,061
Residential Retail Revenue | Idaho Fixed Cost Adjustment [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | [1] | 37,233 | 22,595 | 34,835
Commercial Retail Revenue | Retail revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 378,330 | 347,970 | 314,745
Commercial Retail Revenue | Idaho Fixed Cost Adjustment [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | [1] | 1,338 | 922 | 1,407
Industrial Retail Revenue | Retail revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 244,538 | 217,368 | 195,214
Irrigation Retail Revenue | Retail revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 173,929 | 170,964 | 168,664
Settlement agreement sharing mechanism | Retail revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers |  | 0 | 0 | (569)
Deferred revenue-AFUDC | Retail revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | [2] | (8,780) | (8,780) | $ (8,780)
IPUC authorized AFUDC Collection HCC Relicensing - Gross | Idaho Power Company | Hells Canyon Complex |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulatory Liabilities |  | (8,800) |  |
Energy efficiency regulatory asset | IDAHO |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulatory Liabilities |  | (700) |  |
Energy efficiency regulatory asset |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulatory Assets | [3] | 0 | $ 3,767 |
Energy efficiency regulatory asset | OREGON |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulatory Assets |  | $ 800 |  |
[1] | The FCA mechanism is an alternative revenue program in the Idaho jurisdiction and does not represent revenue from contracts with customers.
[2] | The IPUC allows Idaho Power to recover a portion of the AFUDC on construction work in progress related to the HCC relicensing process, even though the relicensing process is not yet complete and the costs have not been moved to electric plant in service. Idaho Power is collecting $8.8 million annually in the Idaho jurisdiction but is deferring revenue recognition of the amounts collected until the license is issued and the accumulated license costs approved for recovery are placed in service.
[3] | The energy efficiency asset and liability represent the separate Idaho and Oregon jurisdiction balances at December 31, 2022, and December 31, 2023, respectively. During 2023, the balances changed from an asset to a liability in the Idaho jurisdiction.

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