CONTRACT ASSETS AND CONTRACT LIABILITIES (Details) - USD ($) $ in Thousands |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Dec. 31, 2025 |
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Contract liabilities recognized | $ 300 | |
| Accounts receivable | ||
| Accounts receivable—Utility Members | 94,592 | $ 83,743 |
| Other accounts receivable - trade: | 77,059 | 32,892 |
| Contract liabilities | ||
| Contract liabilities (unearned revenue) | 2,807 | 3,182 |
| Other accounts receivable - trade | ||
| Accounts receivable | ||
| Other accounts receivable - trade: | 54,966 | 24,728 |
| Other accounts receivable - trade | Non-member electric sales and transmission | ||
| Accounts receivable | ||
| Other accounts receivable - trade: | 47,985 | 20,921 |
| Other accounts receivable - trade | Other | ||
| Accounts receivable | ||
| Other accounts receivable - trade: | 6,981 | 3,807 |
| Other accounts receivable - non-trade | ||
| Accounts receivable | ||
| Other accounts receivable - trade: | $ 22,093 | $ 8,164 |