Derivative Instruments Gains (Loss) on Derivatives Recognized in Income (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Financial Swaps | Operating revenues | ||
| Derivative Instruments, Gain (Loss) | ||
| Derivative, Gain (Loss) on Derivative, Net | $ 46 | $ 1,012 |
| Financial Swaps | Purchased power | ||
| Derivative Instruments, Gain (Loss) | ||
| Derivative, Gain (Loss) on Derivative, Net | (1,030) | 953 |
| Financial Swaps | Operating Expense | ||
| Derivative Instruments, Gain (Loss) | ||
| Derivative, Gain (Loss) on Derivative, Net | (12,200) | (24,058) |
| Forward contracts | Operating revenues | ||
| Derivative Instruments, Gain (Loss) | ||
| Derivative, Gain (Loss) on Derivative, Net | 366 | 1,006 |
| Forward contracts | Purchased power | ||
| Derivative Instruments, Gain (Loss) | ||
| Derivative, Gain (Loss) on Derivative, Net | (444) | (991) |
| Forward contracts | Operating Expense | ||
| Derivative Instruments, Gain (Loss) | ||
| Derivative, Gain (Loss) on Derivative, Net | $ (603) | $ (221) |