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REGULATORY MATTERS: Oregon Base Rate Changes (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 15, 2024 | Dec. 31, 2026 | Oct. 15, 2025 | Dec. 31, 2024 | Dec. 31, 2025 | Jun. 01, 2025 | Jun. 01, 2024 | Jun. 01, 2023
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  | $ 1,507,372 | $ 1,564,458 |  |  |
Power supply costs |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Regulatory Assets | [1] |  |  |  | $ 18,507 | 0 |  |  |
Oregon jurisdiction |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Annual Power Cost Update |  |  |  |  |  |  | $ (1,800) | $ (6,900) | $ 7,700
OREGON | Wildfire Mitigation Plan Deferral |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  | 3,500 |  |  |
OREGON | Subsequent Event |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  | $ (600) |  |  |  |  |  |
Approved Rate Increase (Decrease), Percentage |  |  | 0.90% |  |  |  |  |  |
OREGON | Subsequent Event | Valmy Plant |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  | $ (1,200) |  |  |  |  |  |
OREGON | Subsequent Event | Boardman Plant |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  | (100) |  |  |  |  |  |
OREGON | Subsequent Event | Wildfire mitigation plan costs |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  | 700 |  |  |  |  |  |
OREGON | 2023 Rate Case |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  |  | $ 6,700 |  |  |  |  |
Approved Return on Equity, Percentage |  | 9.50% |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Percentage |  |  |  | 12.14% |  |  |  |  |
OREGON | 2023 Rate Case | Cost of Capital and Capital Structure |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Authorized Rate of Return in Rate Case |  | 7.302% |  |  |  |  |  |  |
Total Retail Rate Base |  | $ 188,900 |  |  |  |  |  |  |
OREGON | 2023 Rate Case | Cost of Debt Capital Structure [Domain] |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Approved Rate of Return |  | 5.104% |  |  |  |  |  |  |
IDAHO | Wildfire Mitigation Plan Deferral |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  | 88,200 |  |  |
IDAHO | 2023 Rate Case |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Approved Return on Equity, Percentage |  |  |  |  | 9.60% |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount |  |  |  |  | $ (54,700) |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  |  |  |  | 4.25% |  |  |  |
IDAHO | 2025 Rate Case | Wildfire Mitigation Plan Deferral |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  | 73,900 |  |  |
IDAHO | 2025 Rate Case | Subsequent Event |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Approved Rate Increase (Decrease), Amount |  |  | $ 110,000 |  |  |  |  |  |
Approved Return on Equity, Percentage |  |  | 9.60% |  |  |  |  |  |
Approved Rate Increase (Decrease), Percentage |  |  | 7.48% |  |  |  |  |  |
IDAHO | Wildfire mitigation plan costs | Wildfire Mitigation Plan Deferral |  |  |  |  |  |  |  |  |
Oregon Base Rate Changes [Line Items] |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  | $ 700 |  |  |
[1] | This item is discussed in more detail in this Note 3 - "Regulatory Matters."

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