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REGULATORY MATTERS: Oregon Base Rate Changes (Details) - USD ($) $ in Thousands |  |  |  |  |  | 48 Months Ended |  |  |  |  |
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Oct. 15, 2024 | Jun. 01, 2020 | Jun. 01, 2018 | Oct. 01, 2012 | Mar. 01, 2012 | Oct. 31, 2024 | Dec. 31, 2023 | Jun. 01, 2023 | Dec. 31, 2022 | Jun. 01, 2022 | Jun. 01, 2021
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  | $ 1,653,050 |  | $ 1,501,961 |  |
Power supply costs |  |  |  |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets | [1] |  |  |  |  |  |  | 115,525 |  | 129,309 |  |
Oregon Base Rate Changes |  |  |  |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  |  |  |  | $ 1,800 |  |  |  |  |  |
Approved Return on Equity, Percentage |  |  |  |  |  | 9.90% |  |  |  |  |  |
Authorized Rate of Return in Rate Case |  |  |  |  |  | 7.757% |  |  |  |  |  |
Oregon jurisdiction |  |  |  |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual Power Cost Update |  |  |  |  |  |  |  |  | $ 7,700 |  | $ 4,000 | $ 2,400
OREGON | Power supply costs |  |  |  |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  | $ 900 |  | $ 1,100 |  |
OREGON | Oregon Base Rate Changes |  |  |  |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  |  |  | $ 3,000 |  |  |  |  |  |  |
OREGON | Oregon Base Rate Changes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  | $ 400 |  |  |  |  |
OREGON | May 2018 Tax Reform Settlement Stipulation |  |  |  |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  | $ 1,500 | $ 1,500 |  |  |  |  |  |  |  |
OREGON | Idaho Power Company | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  | $ 10,700 |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 19.28% |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  | 1040.00% |  |  |  |  |  |  |  |  |  |
OREGON | Idaho Power Company | Subsequent Event | Cost of Capital and Capital Structure |  |  |  |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  | 780.70% |  |  |  |  |  |  |  |  |  |
Total Retail Rate Base |  | $ 188,900 |  |  |  |  |  |  |  |  |  |
[1] | This item is discussed in more detail in this Note 3 - "Regulatory Matters."

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