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Electric utility segment - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Cash flows from operating activities |  |  |  |
Net cash provided by operating activities |  | $ 284,668 | $ 350,911 |
Cash flows from investing activities |  |  |  |
Capital expenditures |  | (255,450) | (256,920) |
Other |  | 4,316 | 1,808 |
Net cash used in investing activities |  | (237,353) | (24,060) |
Cash flows from financing activities |  |  |  |
Proceeds from issuance of common stock |  | 0 | 556,724 |
Repayment of short-term debt |  | (50,000) | 0 |
Proceeds from issuance of long-term debt |  | 500,000 | 5,204 |
Repayment of long-term debt |  | (694,475) | (12,865) |
Other |  | (16,887) | (12,415) |
Net cash provided by (used in) financing activities |  | (262,957) | 151,855 |
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash from discontinued operations |  | (215,642) | 478,706 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period |  | 1,242,852 | 694,574 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period | $ 1,173,280 | 1,027,210 | 1,173,280 |
Less: Restricted cash | (13,645) | (478,968) | (13,645) |
Cash and cash equivalents | 826,982 | 548,242 | 826,982 | $ 750,535
Hawaiian Electric Consolidated |  |  |  |
Cash flows from operating activities |  |  |  |
Net cash provided by operating activities |  | 320,003 | 322,648 |
Cash flows from investing activities |  |  |  |
Capital expenditures |  | (253,927) | (244,300) |
Advanced (to) from affiliates |  | 0 | 0 |
Other |  | 6,245 | 2,697 |
Net cash used in investing activities |  | (247,682) | (241,603) |
Cash flows from financing activities |  |  |  |
Common stock dividends |  | (20,000) | (26,000) |
Preferred stock dividends of Hawaiian Electric and subsidiaries |  | (1,496) | (1,496) |
Proceeds from issuance of common stock |  | 540 | 0 |
Repayment of short-term debt | 0 | (50,000) |  |
Proceeds from issuance of long-term debt |  | 500,000 | 0 |
Net decrease in short-term borrowings with original maturities of three months or less |  | 0 | 0 |
Repayment of long-term debt |  | (166,000) | 0 |
Payments of obligations under finance leases |  | (7,163) | (5,876) |
Other |  | (8,479) | (6,126) |
Net cash provided by (used in) financing activities |  | 247,402 | (39,498) |
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash from discontinued operations |  | 319,723 | 41,547 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period |  | 184,148 | 108,077 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period | 149,624 | 503,871 | 149,624 |
Less: Restricted cash | (2,000) | 0 | (2,000) |
Cash and cash equivalents | 147,624 | 503,871 | 147,624 | 184,148
Consolidating adjustments | Hawaiian Electric Consolidated |  |  |  |
Cash flows from operating activities |  |  |  |
Net cash provided by operating activities |  | 0 | (2,082) |
Cash flows from investing activities |  |  |  |
Capital expenditures |  | 0 | 0 |
Advanced (to) from affiliates |  | 20,500 | 30,700 |
Other |  | 0 | 21,882 |
Net cash used in investing activities |  | 20,500 | 52,582 |
Cash flows from financing activities |  |  |  |
Common stock dividends |  | 0 | 0 |
Preferred stock dividends of Hawaiian Electric and subsidiaries |  | 0 | 0 |
Proceeds from issuance of common stock |  | 0 | (19,800) |
Repayment of short-term debt |  | 0 |  |
Proceeds from issuance of long-term debt |  | 0 |  |
Net decrease in short-term borrowings with original maturities of three months or less |  | (20,500) | (30,700) |
Repayment of long-term debt |  | 0 |  |
Payments of obligations under finance leases |  | 0 | 0 |
Other |  | 0 | 0 |
Net cash provided by (used in) financing activities |  | (20,500) | (50,500) |
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash from discontinued operations |  | 0 | 0 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period |  | 0 | 0 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period | 0 |  | 0 |
Less: Restricted cash | 0 |  | 0 |
Cash and cash equivalents | 0 | 0 | 0 | 0
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |
Cash flows from operating activities |  |  |  |
Net cash provided by operating activities |  | 228,320 | 237,155 |
Cash flows from investing activities |  |  |  |
Capital expenditures |  | (130,207) | (141,000) |
Advanced (to) from affiliates |  | (20,500) | (30,700) |
Other |  | 4,073 | (18,696) |
Net cash used in investing activities |  | (146,634) | (190,396) |
Cash flows from financing activities |  |  |  |
Common stock dividends |  | (20,000) | (26,000) |
Preferred stock dividends of Hawaiian Electric and subsidiaries |  | (1,496) | (1,496) |
Proceeds from issuance of common stock |  | 540 | 0 |
Repayment of short-term debt |  | (50,000) |  |
Proceeds from issuance of long-term debt |  | 500,000 |  |
Net decrease in short-term borrowings with original maturities of three months or less |  | 0 | 0 |
Repayment of long-term debt |  | (166,000) |  |
Payments of obligations under finance leases |  | (6,087) | (5,233) |
Other |  | (7,986) | (4,393) |
Net cash provided by (used in) financing activities |  | 248,971 | (37,122) |
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash from discontinued operations |  | 330,657 | 9,637 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period |  | 118,367 | 91,755 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period | 101,392 |  | 101,392 |
Less: Restricted cash | (2,000) |  | (2,000) |
Cash and cash equivalents | 99,392 | 449,024 | 99,392 | 118,367
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |
Cash flows from operating activities |  |  |  |
Net cash provided by operating activities |  | 54,543 | 54,936 |
Cash flows from investing activities |  |  |  |
Capital expenditures |  | (49,738) | (39,405) |
Advanced (to) from affiliates |  | 0 | 0 |
Other |  | 1,163 | 523 |
Net cash used in investing activities |  | (48,575) | (38,882) |
Cash flows from financing activities |  |  |  |
Common stock dividends |  | 0 | 0 |
Preferred stock dividends of Hawaiian Electric and subsidiaries |  | 0 | 0 |
Proceeds from issuance of common stock |  | 0 | 0 |
Repayment of short-term debt |  | 0 |  |
Proceeds from issuance of long-term debt |  | 0 |  |
Net decrease in short-term borrowings with original maturities of three months or less |  | 0 | 0 |
Repayment of long-term debt |  | 0 |  |
Payments of obligations under finance leases |  | (623) | (470) |
Other |  | (142) | (508) |
Net cash provided by (used in) financing activities |  | (765) | (978) |
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash from discontinued operations |  | 5,203 | 15,076 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period |  | 31,534 | 10,658 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period | 25,734 |  | 25,734 |
Less: Restricted cash | 0 |  | 0 |
Cash and cash equivalents | 25,734 | 36,737 | 25,734 | 31,534
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |
Cash flows from operating activities |  |  |  |
Net cash provided by operating activities |  | 40,655 | 41,851 |
Cash flows from investing activities |  |  |  |
Capital expenditures |  | (73,982) | (63,895) |
Advanced (to) from affiliates |  | 0 | 0 |
Other |  | 1,009 | (1,012) |
Net cash used in investing activities |  | (72,973) | (64,907) |
Cash flows from financing activities |  |  |  |
Common stock dividends |  | 0 | 0 |
Preferred stock dividends of Hawaiian Electric and subsidiaries |  | 0 | 0 |
Proceeds from issuance of common stock |  | 0 | 0 |
Repayment of short-term debt |  | 0 |  |
Proceeds from issuance of long-term debt |  | 0 |  |
Net decrease in short-term borrowings with original maturities of three months or less |  | 20,500 | 30,700 |
Repayment of long-term debt |  | 0 |  |
Payments of obligations under finance leases |  | (453) | (173) |
Other |  | (351) | (1,225) |
Net cash provided by (used in) financing activities |  | 19,696 | 29,302 |
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash from discontinued operations |  | (12,622) | 6,246 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period |  | 16,456 | 5,587 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period | 11,833 |  | 11,833 |
Less: Restricted cash | 0 |  | 0 |
Cash and cash equivalents | 11,833 | 3,834 | 11,833 | 16,456
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |
Cash flows from operating activities |  |  |  |
Net cash provided by operating activities |  | (3,515) | (9,212) |
Cash flows from investing activities |  |  |  |
Capital expenditures |  | 0 | 0 |
Advanced (to) from affiliates |  | 0 | 0 |
Other |  | 0 | 0 |
Net cash used in investing activities |  | 0 | 0 |
Cash flows from financing activities |  |  |  |
Common stock dividends |  | 0 | 0 |
Preferred stock dividends of Hawaiian Electric and subsidiaries |  | 0 | 0 |
Proceeds from issuance of common stock |  | 0 | 19,800 |
Repayment of short-term debt |  | 0 |  |
Proceeds from issuance of long-term debt |  | 0 |  |
Net decrease in short-term borrowings with original maturities of three months or less |  | 0 | 0 |
Repayment of long-term debt |  | 0 |  |
Payments of obligations under finance leases |  | 0 | 0 |
Other |  | 0 | 0 |
Net cash provided by (used in) financing activities |  | 0 | 19,800 |
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash from discontinued operations |  | (3,515) | 10,588 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period |  | 17,791 | 77 |
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period | 10,665 |  | 10,665 |
Less: Restricted cash | 0 |  | 0 |
Cash and cash equivalents | $ 10,665 | $ 14,276 | $ 10,665 | $ 17,791

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