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Shareholders' equity (Tables) | 6 Months Ended
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Jun. 30, 2025
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income | Changes in the balances of each component of accumulated other comprehensive income/(loss) (AOCI) were as follows:
| HEI Consolidated |  | Hawaiian Electric Consolidated
(in thousands) | Net unrealized gains (losses) on securities |  | Unrealized gains (losses) on derivatives |  | Retirement benefit plans |  | AOCI |  | AOCI-Retirement benefit plans
Balance, December 31, 2024 | $ | — |  |  | $ | 2,120 |  |  | $ | 1,341 |  |  | $ | 3,461 |  |  | $ | 2,786 |
Current period other comprehensive loss | — |  |  | (720) |  |  | (46) |  |  | (766) |  |  | (94) |
Balance, June 30, 2025 | $ | — |  |  | $ | 1,400 |  |  | $ | 1,295 |  |  | $ | 2,695 |  |  | $ | 2,692 |
Balance, December 31, 2023 | $ | (282,963) |  |  | $ | 1,638 |  |  | $ | (8,025) |  |  | $ | (289,350) |  |  | $ | 2,849 |
Current period other comprehensive income (loss) | (8,901) |  |  | 670 |  |  | 24 |  |  | (8,207) |  |  | (95) |
Balance, June 30, 2024 | $ | (291,864) |  |  | $ | 2,308 |  |  | $ | (8,001) |  |  | $ | (297,557) |  |  | $ | 2,754 |
Schedule of Reclassification out of AOCI | Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  | Affected line item in the Statements of Income / Balance Sheets
|  | Three months ended June 30 |  | Six months ended June 30 |
(in thousands) |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Amortization of unrealized holding losses on held-to-maturity securities |  | $ | — |  |  | $ | 3,288 |  |  | $ | — |  |  | $ | 6,374 |  |  | Assets of discontinued operations
Net realized gains on derivatives qualifying as cash flow hedges |  | (50) |  |  | (51) |  |  | (100) |  |  | (99) |  |  | Interest expense
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of net gains recognized during the period in net periodic benefit cost |  | (508) |  |  | (445) |  |  | (1,013) |  |  | (894) |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | 484 |  |  | 459 |  |  | 967 |  |  | 918 |  |  | See Note 8 for additional details
Total reclassifications |  | $ | (74) |  |  | $ | 3,251 |  |  | $ | (146) |  |  | $ | 6,299 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of net gains recognized during the period in net periodic benefit cost |  | $ | (531) |  |  | $ | (505) |  |  | $ | (1,061) |  |  | $ | (1,013) |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | 484 |  |  | 459 |  |  | 967 |  |  | 918 |  |  | See Note 8 for additional details
Total reclassifications |  | $ | (47) |  |  | $ | (46) |  |  | $ | (94) |  |  | $ | (95) |  |  |

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