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Shareholders' equity | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Shareholders' equity | Shareholders' equity Accumulated other comprehensive income/(loss). 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 | — |  |  | (1,466) |  |  | (34) |  |  | (1,500) |  |  | (118) |
Balance, September 30, 2025 | $ | — |  |  | $ | 654 |  |  | $ | 1,307 |  |  | $ | 1,961 |  |  | $ | 2,668 |
Balance, December 31, 2023 | $ | (282,963) |  |  | $ | 1,638 |  |  | $ | (8,025) |  |  | $ | (289,350) |  |  | $ | 2,849 |
Current period other comprehensive income (loss) | 31,260 |  |  | (220) |  |  | 113 |  |  | 31,153 |  |  | (93) |
Balance, September 30, 2024 | $ | (251,703) |  |  | $ | 1,418 |  |  | $ | (7,912) |  |  | $ | (258,197) |  |  | $ | 2,756 |
Reclassifications out of AOCI were as follows:
|  | Amount reclassified from AOCI |  | Affected line item in the Statements of Income / Balance Sheets
|  | Three months ended September 30 |  | Nine months ended September 30 |
(in thousands) |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Amortization of unrealized holding losses on held-to-maturity securities |  | $ | — |  |  | $ | 3,366 |  |  | $ | — |  |  | $ | 9,740 |  |  | Assets of discontinued operations
Net realized gains on derivatives qualifying as cash flow hedges |  | (877) |  |  | (52) |  |  | (977) |  |  | (151) |  |  | Interest expense and gain on sale of subsidiaries
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of net gains recognized during the period in net periodic benefit cost |  | (540) |  |  | (1,244) |  |  | (1,553) |  |  | (2,138) |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | 552 |  |  | 1,333 |  |  | 1,519 |  |  | 2,251 |  |  | See Note 8 for additional details
Total reclassifications |  | $ | (865) |  |  | $ | 3,403 |  |  | $ | (1,011) |  |  | $ | 9,702 |  |  |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |
Retirement benefit plans: |  |  |  |  |  |  |  |  |  |
Amortization of net gains recognized during the period in net periodic benefit cost |  | $ | (576) |  |  | $ | (1,331) |  |  | $ | (1,637) |  |  | $ | (2,344) |  |  | See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets |  | 552 |  |  | 1,333 |  |  | 1,519 |  |  | 2,251 |  |  | See Note 8 for additional details
Total reclassifications |  | $ | (24) |  |  | $ | 2 |  |  | $ | (118) |  |  | $ | (93) |  |  |

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