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Fair value measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Carrying or Notional Amount, Fair Value and Placement in the Fair Value Hierarchy of the Company’s Financial Instruments | The following table presents the carrying or notional amount, fair value and placement in the fair value hierarchy of the Company’s financial instruments.
|  |  |  | Estimated fair value
(in thousands) |  | Carrying or notional amount |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  |  |  | Total
September 30, 2025 |  |  |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Money market mutual funds |  | $ | 925,258 |  |  | $ | 925,258 |  |  | $ | — |  |  |  |  | $ | 925,258 |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |
Money market mutual funds |  | 402,575 |  |  | 402,575 |  |  | — |  |  |  |  | 402,575 |
Financial liabilities |  |  |  |  |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Long-term debt, net |  | 2,438,691 |  |  | — |  |  | 2,104,038 |  |  |  |  | 2,104,038 |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |
Long-term debt, net |  | 2,182,533 |  |  | — |  |  | 1,871,292 |  |  |  |  | 1,871,292 |
December 31, 2024 |  |  |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Money market mutual funds |  | $ | 1,162,259 |  |  | $ | 1,162,259 |  |  | $ | — |  |  |  |  | $ | 1,162,259 |
Derivative assets |  | 29,312 |  |  | — |  |  | 1,629 |  |  |  |  | 1,629 |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |
Money market mutual funds |  | 115,599 |  |  | 115,599 |  |  | — |  |  |  |  | 115,599 |
Financial liabilities |  |  |  |  |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |  |  |  |  |
Short-term borrowings, net |  | 48,623 |  |  | — |  |  | 48,623 |  |  |  |  | 48,623 |
Long-term debt, net |  | 2,799,558 |  |  | — |  |  | 2,196,403 |  |  |  |  | 2,196,403 |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |
Short-term borrowings, net |  | 48,623 |  |  | — |  |  | 48,623 |  |  |  |  | 48,623 |
Long-term debt, net |  | 1,901,214 |  |  | — |  |  | 1,446,316 |  |  |  |  | 1,446,316 |

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