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Regulatory Assets and Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2025
Regulated Operations [Abstract] |
Schedule of Regulatory Assets and Liabilities | Regulatory assets and liabilities were comprised of the following as of September 30, 2025 and December 31, 2024:
| Recovery Period |  | September 30, 2025 |  | December 31, 2024
Regulatory Assets |  |  |  |  |
Property-related temporary differences (tax benefits flowed through to customers) | Indefinite |  | $ | 178,279 |  |  | $ | 178,279 |
Asset retirement obligations, net | Indefinite |  | 31,051 |  |  | 28,883 |
Other accrued benefits | Indefinite |  | 26,756 |  |  | 25,439 |
IRMA long-term accounts receivable | Various |  | 25,233 |  |  | 46,278 |
Tank coating | Various |  | 19,527 |  |  | 21,477 |
MWRAM long-term regulatory asset | 1 - 2 years |  | 13,570 |  |  | 16,353 |
General District Balancing Account receivable | Various |  | 9,724 |  |  | 9,393 |
Incremental Cost Balancing Accounts (ICBA) | 1 year |  | 4,608 |  |  | 8,251 |
Customer Assistance Program and Rate Support Fund accounts receivable | 1 year |  | 4,423 |  |  | 9,910 |
Net WRAM and Modified Cost Balancing Account (MCBA) long-term accounts receivable | Various |  | 3,776 |  |  | 3,633 |
Recoverable property losses | Various |  | 2,131 |  |  | 2,633 |
Other regulatory assets | Various |  | 7,441 |  |  | 6,877 |
Total Regulatory Assets |  |  | $ | 326,519 |  |  | $ | 357,406 |
Regulatory Liabilities |  |  |  |  |
Cost of removal |  |  | $ | 514,145 |  |  | $ | 483,108 |
Pension and retiree group health |  |  | 173,593 |  |  | 174,708 |
Future tax benefits due to customers |  |  | 104,154 |  |  | 106,184 |
PFAS settlement proceeds |  |  | 24,000 |  |  | — |
Other components of net periodic benefit cost |  |  | 22,812 |  |  | 18,287 |
Pension Cost Balancing Account |  |  | 17,009 |  |  | 14,143 |
Health Cost Balancing Account |  |  | 4,264 |  |  | 3,630 |
Net WRAM and MCBA long-term payable |  |  | 3,103 |  |  | 3,064 |
Conservation Expense Balancing Account |  |  | 2,909 |  |  | 3,294 |
ICBA |  |  | 2,548 |  |  | 6,003 |
Other regulatory liabilities |  |  | 2,083 |  |  | 2,130 |
Total Regulatory Liabilities |  |  | $ | 870,620 |  |  | $ | 814,551 |

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