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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