Regulation and Rates - Power Cost Adjustment Mechanism (Details) - Subsidiaries - USD ($) $ in Thousands |
6 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended | |||
|---|---|---|---|---|---|---|---|
Jan. 01, 2026 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2026 |
Dec. 31, 2027 |
Dec. 31, 2025 |
Dec. 31, 2026 |
|
| Regulation and Rates [Line Items] | |||||||
| Annual Power Cost Variability, Amount | $ (39,639) | $ 115,980 | $ 97,700 | ||||
| Electricity, US Regulated [Member] | PCA Mechanism | |||||||
| Regulation and Rates [Line Items] | |||||||
| Public Utilities, Approved Rate Increase (Decrease), Amount | $ 748,400 | ||||||
| Public Utilities, Approved Rate Increase (Decrease), Percentage | 20.80% | ||||||
| Forecast | |||||||
| Regulation and Rates [Line Items] | |||||||
| Annual Power Cost Variability, Amount | $ 56,100 | $ 59,500 | $ 42,000 | ||||
| Customer's share plus interest | Under | |||||||
| Regulation and Rates [Line Items] | |||||||
| Annual Power Cost Variability, Amount | $ 155,600 | ||||||