REGULATORY MATTERS (Regulatory Assets and Liabilities - Footnotes) (Details) |
9 Months Ended |
|---|---|
Sep. 30, 2026 | |
| Roadrunner Reserve I | |
| Regulatory Assets [Line Items] | |
| Investment tax credits, amortization period | 5 years |
| Income Taxes Recoverable (Payable) through Future Rates | |
| Regulatory Assets [Line Items] | |
| Amortization period | 10 years |