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Balancing and Memorandum Accounts (Tables) | 9 Months Ended
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Sep. 30, 2021
Regulated Operations [Abstract] |
Public Utilities General Disclosures | Balancing and memorandum accounts recorded to regulatory assets, net for the three and nine months ended September 30, 2021, and 2020 as follows:
| Three months ended September 30, 2021 |  | Three months ended September 30, 2020
Beginning Balance |  | Regulatory Asset Increase (Decrease) |  | Refunds (Collections) Adjustments |  |  |  | Ending Balance |  | Beginning Balance |  | Regulatory Asset Increase (Decrease) |  | Refunds (Collections) Adjustments |  |  |  | Ending Balance
Revenue accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MWRAM | $ | 15,278 |  |  | 363 |  |  | — |  |  |  |  | 15,641 |  |  | $ | 10,549 |  |  | (1,124) |  |  | 2,625 |  |  |  |  | 12,050 |
Cost of capital memorandum account | (1,562) |  |  | — |  |  | — |  |  |  |  | (1,562) |  |  | (1,560) |  |  | (1) |  |  | — |  |  |  |  | (1,561) |
Tax memorandum account | 333 |  |  | — |  |  | — |  |  |  |  | 333 |  |  | 332 |  |  | 1 |  |  | — |  |  |  |  | 333 |
All others | (829) |  |  | 397 |  |  | — |  |  |  |  | (432) |  |  | (1,034) |  |  | 37 |  |  | 1 |  |  |  |  | (996) |
Total revenue accounts | $ | 13,220 |  |  | 760 |  |  | — |  |  |  |  | 13,980 |  |  | $ | 8,287 |  |  | (1,087) |  |  | 2,626 |  |  |  |  | 9,826 |
Cost-recovery accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Water supply costs | 9,895 |  |  | 388 |  |  | — |  |  |  |  | 10,283 |  |  | 5,899 |  |  | 1,222 |  |  | 1 |  |  |  |  | 7,122 |
Pension | 4,210 |  |  | 366 |  |  | — |  |  |  |  | 4,576 |  |  | 2,985 |  |  | (253) |  |  | — |  |  |  |  | 2,732 |
Hydro Generation Research, Development and Demonstration Memorandum Account (“PRVMA”) | 928 |  |  | — |  |  | (121) |  |  |  |  | 807 |  |  | — |  |  | 1,219 |  |  | (8) |  |  |  |  | 1,211 |
COVID-19 Catastrophic Event Memorandum Account (“CEMA”) | 2,618 |  |  | 567 |  |  | — |  |  |  |  | 3,185 |  |  | — |  |  | — |  |  | — |  |  |  |  | — |
All others | 446 |  |  | — |  |  | — |  |  |  |  | 446 |  |  | 444 |  |  | — |  |  | — |  |  |  |  | 444 |
Total cost-recovery accounts | $ | 18,097 |  |  | 1,321 |  |  | (121) |  |  |  |  | 19,297 |  |  | $ | 9,328 |  |  | 2,188 |  |  | (7) |  |  |  |  | 11,509 |
Total | $ | 31,317 |  |  | 2,081 |  |  | (121) |  |  |  |  | 33,277 |  |  | $ | 17,615 |  |  | 1,101 |  |  | 2,619 |  |  |  |  | 21,335 |
| Nine months ended September 30, 2021 |  | Nine months ended September 30, 2020
Beginning Balance |  | Regulatory Asset Increase (Decrease) |  | Refunds (Collections) Adjustments |  |  |  | Ending Balance |  | Beginning Balance |  | Regulatory Asset Increase (Decrease) |  | Refunds (Collections) Adjustments |  |  |  | Ending Balance
Revenue accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MWRAM | $ | 12,077 |  |  | 3,563 |  |  | 1 |  |  |  |  | 15,641 |  |  | $ | 7,015 |  |  | 2,437 |  |  | 2,598 |  |  |  |  | 12,050 |
Cost of capital memorandum account | (1,561) |  |  | (1) |  |  | — |  |  |  |  | (1,562) |  |  | (1,553) |  |  | (8) |  |  | — |  |  |  |  | (1,561) |
Tax memorandum account | 333 |  |  | — |  |  | — |  |  |  |  | 333 |  |  | (6,643) |  |  | (2) |  |  | 6,978 |  |  |  |  | 333 |
All others | (806) |  |  | 369 |  |  | 5 |  |  |  |  | (432) |  |  | (759) |  |  | (128) |  |  | (109) |  |  |  |  | (996) |
Total revenue accounts | $ | 10,043 |  |  | 3,931 |  |  | 6 |  |  |  |  | 13,980 |  |  | $ | (1,940) |  |  | 2,299 |  |  | 9,467 |  |  |  |  | 9,826 |
Cost-recovery accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Water supply costs | 8,123 |  |  | 2,159 |  |  | 1 |  |  |  |  | 10,283 |  |  | 4,328 |  |  | 2,827 |  |  | (33) |  |  |  |  | 7,122 |
Pension | 3,478 |  |  | 1,098 |  |  | — |  |  |  |  | 4,576 |  |  | 2,449 |  |  | 261 |  |  | 22 |  |  |  |  | 2,732 |
PRVMA | 1,108 |  |  | — |  |  | (301) |  |  |  |  | 807 |  |  | — |  |  | 1,219 |  |  | (8) |  |  |  |  | 1,211 |
CEMA | 2,266 |  |  | 919 |  |  | — |  |  |  |  | 3,185 |  |  | — |  |  | — |  |  | — |  |  |  |  | — |
All others | 445 |  |  | 1 |  |  | — |  |  |  |  | 446 |  |  | 446 |  |  | 2 |  |  | (4) |  |  |  |  | 444 |
Total cost-recovery accounts | $ | 15,420 |  |  | 4,177 |  |  | (300) |  |  |  |  | 19,297 |  |  | $ | 7,223 |  |  | 4,309 |  |  | (23) |  |  |  |  | 11,509 |
Total | $ | 25,463 |  |  | 8,108 |  |  | (294) |  |  |  |  | 33,277 |  |  | $ | 5,283 |  |  | 6,608 |  |  | 9,444 |  |  |  |  | 21,335 |

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