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Electric utility segment - Condensed consolidating statement of cash flows (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Cash flows from operating activities      
Net cash provided by operating activities $ 41,730 $ 61,293  
Cash flows from investing activities      
Capital expenditures (74,079) (125,554)  
Other 4,622 2,942  
Net cash used in investing activities (518,020) (260,463)  
Cash flows from financing activities      
Common stock dividends (37,156) (36,018)  
Proceeds from issuance of short-term debt 0 50,000  
Repayment of short-term debt (65,000) 0  
Proceeds from issuance of long-term debt 161,800 186,925  
Net increase in other bank borrowings with original maturities of three months or less 13,015 42,495  
Other (4,621) (4,590)  
Net cash provided by financing activities 408,957 207,901  
Net increase (decrease) in cash, cash equivalents and restricted cash (67,333) 8,731  
Cash, cash equivalents and restricted cash, beginning of period 358,979 227,685  
Cash, cash equivalents and restricted cash, end of period 291,646 236,416  
Less: Restricted cash (14,067) (30,902) $ (17,558)
Cash and cash equivalents, end of period 277,579 205,514 341,421
Consolidating adjustments      
Cash flows from operating activities      
Net cash provided by operating activities (7,426) (7,272)  
Cash flows from investing activities      
Capital expenditures 0 0  
Advances from affiliates (26,700) 9,000  
Other 0 (404)  
Net cash used in investing activities (26,700) 8,596  
Cash flows from financing activities      
Common stock dividends 7,426 7,676  
Preferred stock dividends of Hawaiian Electric and subsidiaries 0 0  
Proceeds from issuance of short-term debt   0  
Repayment of short-term debt 0    
Proceeds from issuance of long-term debt 0 0  
Net increase in other bank borrowings with original maturities of three months or less 26,700 (9,000)  
Other 0 0  
Net cash provided by financing activities 34,126 (1,324)  
Net increase (decrease) in cash, cash equivalents and restricted cash 0 0  
Cash, cash equivalents and restricted cash, beginning of period 0 0  
Cash, cash equivalents and restricted cash, end of period 0 0  
Less: Restricted cash 0 0 0
Cash and cash equivalents, end of period 0 0 0
Hawaiian Electric (parent only) | Reportable Legal Entities      
Cash flows from operating activities      
Net cash provided by operating activities 18,764 29,004  
Cash flows from investing activities      
Capital expenditures (45,293) (83,191)  
Advances from affiliates 26,700 (17,000)  
Other 1,182 2,752  
Net cash used in investing activities (17,411) (97,439)  
Cash flows from financing activities      
Common stock dividends (27,925) (26,784)  
Preferred stock dividends of Hawaiian Electric and subsidiaries (270) (270)  
Proceeds from issuance of short-term debt   50,000  
Repayment of short-term debt (50,000)    
Proceeds from issuance of long-term debt 60,000 95,000  
Net increase in other bank borrowings with original maturities of three months or less 0 (46,987)  
Other (96) (21)  
Net cash provided by financing activities (18,291) 70,938  
Net increase (decrease) in cash, cash equivalents and restricted cash (16,938) 2,503  
Cash, cash equivalents and restricted cash, beginning of period 58,171 32,988  
Cash, cash equivalents and restricted cash, end of period 41,233 35,491  
Less: Restricted cash (11,506) (30,902) (15,966)
Cash and cash equivalents, end of period 29,727 4,589 42,205
Hawaii Electric Light | Reportable Legal Entities      
Cash flows from operating activities      
Net cash provided by operating activities 9,635 9,478  
Cash flows from investing activities      
Capital expenditures (12,728) (18,181)  
Advances from affiliates 0 8,000  
Other 372 64  
Net cash used in investing activities (12,356) (10,117)  
Cash flows from financing activities      
Common stock dividends (3,650) (4,080)  
Preferred stock dividends of Hawaiian Electric and subsidiaries (134) (134)  
Proceeds from issuance of short-term debt   0  
Repayment of short-term debt 0    
Proceeds from issuance of long-term debt 30,000 0  
Net increase in other bank borrowings with original maturities of three months or less (18,800) 2,500  
Other (11) (1)  
Net cash provided by financing activities 7,405 (1,715)  
Net increase (decrease) in cash, cash equivalents and restricted cash 4,684 (2,354)  
Cash, cash equivalents and restricted cash, beginning of period 3,046 7,008  
Cash, cash equivalents and restricted cash, end of period 7,730 4,654  
Less: Restricted cash 0 0 0
Cash and cash equivalents, end of period 7,730 4,654 3,046
Maui Electric | Reportable Legal Entities      
Cash flows from operating activities      
Net cash provided by operating activities 10,988 7,931  
Cash flows from investing activities      
Capital expenditures (12,340) (17,772)  
Advances from affiliates 0 0  
Other 309 301  
Net cash used in investing activities (12,031) (17,471)  
Cash flows from financing activities      
Common stock dividends (3,776) (3,596)  
Preferred stock dividends of Hawaiian Electric and subsidiaries (95) (95)  
Proceeds from issuance of short-term debt   0  
Repayment of short-term debt 0    
Proceeds from issuance of long-term debt 25,000 0  
Net increase in other bank borrowings with original maturities of three months or less (7,900) 14,500  
Other (9) (1)  
Net cash provided by financing activities 13,220 10,808  
Net increase (decrease) in cash, cash equivalents and restricted cash 12,177 1,268  
Cash, cash equivalents and restricted cash, beginning of period 2,032 1,797  
Cash, cash equivalents and restricted cash, end of period 14,209 3,065  
Less: Restricted cash 0 0 0
Cash and cash equivalents, end of period 14,209 3,065 2,032
Other subsidiaries | Reportable Legal Entities      
Cash flows from operating activities      
Net cash provided by operating activities 0 0  
Cash flows from investing activities      
Capital expenditures 0 0  
Advances 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 short-term debt   0  
Repayment of short-term debt 0    
Proceeds from issuance of long-term debt 0 0  
Net increase in other bank borrowings with original maturities of three months or less 0 0  
Other 0 0  
Net cash provided by financing activities 0 0  
Net increase (decrease) in cash, cash equivalents and restricted cash 0 0  
Cash, cash equivalents and restricted cash, beginning of period 77 101  
Cash, cash equivalents and restricted cash, end of period 77 101  
Less: Restricted cash 0 0 0
Cash and cash equivalents, end of period 77 101 77
Hawaiian Electric Consolidated      
Cash flows from operating activities      
Net cash provided by operating activities 31,961 39,141  
Cash flows from investing activities      
Capital expenditures (70,361) (119,144)  
Advances from affiliates 0 0  
Other 1,863 2,713  
Net cash used in investing activities (68,498) (116,431)  
Cash flows from financing activities      
Common stock dividends (27,925) (26,784)  
Preferred stock dividends of Hawaiian Electric and subsidiaries (499) (499)  
Proceeds from issuance of short-term debt 0 50,000  
Repayment of short-term debt (50,000) 0  
Proceeds from issuance of long-term debt 115,000 95,000  
Net increase in other bank borrowings with original maturities of three months or less 0 (38,987)  
Other (116) (23)  
Net cash provided by financing activities 36,460 78,707  
Net increase (decrease) in cash, cash equivalents and restricted cash (77) 1,417  
Cash, cash equivalents and restricted cash, beginning of period 63,326 41,894  
Cash, cash equivalents and restricted cash, end of period 63,249 43,311  
Less: Restricted cash (11,506) (30,902) (15,966)
Cash and cash equivalents, end of period $ 51,743 $ 12,409 $ 47,360