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Electric utility segment - Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Utility property, plant and equipment            
Total property, plant and equipment, net $ 6,298,721   $ 6,150,126      
Current assets            
Cash and cash equivalents 550,408   679,546 $ 314,284    
Restricted cash 16,422   15,028 5,104    
Other long-term assets            
Operating lease right-of-use assets 86,819   94,905      
Total assets 17,055,414   17,243,821      
Capitalization            
Common stock equity 1,085,273 $ 2,377,380 2,344,841 2,249,377 $ 2,237,955 $ 2,202,499
Preferred stock of subsidiaries - not subject to mandatory redemption 34,293   34,293      
Current liabilities            
Interest and dividends payable 34,528   51,206      
Deferred credits and other liabilities            
Deferred income taxes 0   297,954      
Total liabilities and shareholders’ equity 17,055,414   17,243,821      
Hawaiian Electric Consolidated            
Utility property, plant and equipment            
Land 52,019   52,098      
Plant and equipment 8,351,894   8,232,810      
Financing lease right-of-use assets 449,572   342,174      
Less accumulated depreciation (3,286,720)   (3,197,514)      
Construction in progress 336,203   320,223      
Utility property, plant and equipment, net 5,902,968   5,749,791      
Nonutility property, plant and equipment, less accumulated depreciation 6,940   6,942      
Total property, plant and equipment, net 5,909,908   5,756,733      
Investment in wholly owned subsidiaries, at equity 0   0      
Current assets            
Cash and cash equivalents 88,620   106,077 143,647    
Restricted cash 2,000   2,000 0    
Advances to affiliates 0   0      
Customer accounts receivable, net 211,315   244,309      
Accrued unbilled revenues, net 178,546   185,644      
Other accounts receivable, net 57,892   111,519      
Fuel oil stock, at average cost 146,091   148,237      
Materials and supplies, at average cost 113,004   114,433      
Prepayments and other 66,596   58,491      
Regulatory assets 79,270   68,453      
Total current assets 943,334   1,039,163      
Other long-term assets            
Operating lease right-of-use assets 64,740   71,877      
Regulatory assets 243,139   226,351      
Other 237,777   189,430      
Total other long-term assets 545,656   487,658      
Total assets 7,398,898   7,283,554      
Capitalization            
Common stock equity 1,192,842 $ 2,435,282 2,409,110 2,371,889 $ 2,358,884 2,344,170
Preferred stock of subsidiaries - not subject to mandatory redemption 34,293   34,293      
Long-term debt, net 1,887,793   1,934,277      
Total capitalization 3,114,928   4,377,680      
Current liabilities            
Current portion of operating lease liabilities 15,902   16,617      
Current portion of long-term debt 46,954   0      
Accounts payable 194,534   191,040      
Interest and dividends payable 22,992   22,882      
Taxes accrued, including revenue taxes 249,459   291,942      
Regulatory liabilities 24,106   36,559      
Wildfire tort-related claims (Note 2) 1,712,000   75,000      
Other 112,037   96,436      
Total current liabilities 2,377,984   730,476      
Deferred credits and other liabilities            
Operating lease liabilities 54,779   62,098      
Finance lease liabilities 433,231   330,978      
Deferred income taxes 0   399,001      
Regulatory liabilities 1,151,503   1,114,131      
Unamortized tax credits 79,231   84,312      
Defined benefit pension and other postretirement benefit plans liability 60,636   60,671      
Other 126,606   124,207      
Total deferred credits and other liabilities 1,905,986   2,175,398      
Total liabilities and shareholders’ equity 7,398,898   7,283,554      
Hawaiian Electric Consolidated | Affiliated Entity            
Current liabilities            
Short-term borrowings from non-affiliates 0   0      
Consolidating adjustments | Hawaiian Electric Consolidated            
Utility property, plant and equipment            
Land 0   0      
Plant and equipment 0   0      
Financing lease right-of-use assets 0   0      
Less accumulated depreciation 0   0      
Construction in progress 0   0      
Utility property, plant and equipment, net 0   0      
Nonutility property, plant and equipment, less accumulated depreciation 0   0      
Total property, plant and equipment, net 0   0      
Investment in wholly owned subsidiaries, at equity (482,112)   (722,211)      
Current assets            
Cash and cash equivalents 0   0 0    
Restricted cash 0   0      
Advances to affiliates (110,000)   (70,500)      
Customer accounts receivable, net 0   0      
Accrued unbilled revenues, net 0   0      
Other accounts receivable, net (38,430)   (77,480)      
Fuel oil stock, at average cost 0   0      
Materials and supplies, at average cost 0   0      
Prepayments and other (4,287)   (1,638)      
Regulatory assets 0   0      
Total current assets (152,717)   (149,618)      
Other long-term assets            
Operating lease right-of-use assets 0   0      
Regulatory assets 0   0      
Other (47,337)   (14,171)      
Total other long-term assets (47,337)   (14,171)      
Total assets (682,166)   (886,000)      
Capitalization            
Common stock equity (482,112)   (722,211) (708,465)   (701,833)
Preferred stock of subsidiaries - not subject to mandatory redemption 0   0      
Long-term debt, net 0   0      
Total capitalization (482,112)   (722,211)      
Current liabilities            
Current portion of operating lease liabilities 0   0      
Current portion of long-term debt 0          
Accounts payable 0   0      
Interest and dividends payable (631)   (375)      
Taxes accrued, including revenue taxes (4,287)   (1,638)      
Regulatory liabilities 0   0      
Wildfire tort-related claims (Note 2) 0   0      
Other (37,799)   (77,105)      
Total current liabilities (152,717)   (149,618)      
Deferred credits and other liabilities            
Operating lease liabilities 0   0      
Finance lease liabilities 0   0      
Deferred income taxes (32,540)   0      
Regulatory liabilities 0   0      
Unamortized tax credits 0   0      
Defined benefit pension and other postretirement benefit plans liability (14,797)   (14,171)      
Other 0   0      
Total deferred credits and other liabilities (47,337)   (14,171)      
Total liabilities and shareholders’ equity (682,166)   (886,000)      
Consolidating adjustments | Hawaiian Electric Consolidated | Affiliated Entity            
Current liabilities            
Short-term borrowings from non-affiliates (110,000)   (70,500)      
Hawaiian Electric            
Current assets            
Cash and cash equivalents 124,400          
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated            
Utility property, plant and equipment            
Land 42,860   42,859      
Plant and equipment 5,471,342   5,398,281      
Financing lease right-of-use assets 362,741   306,099      
Less accumulated depreciation (2,001,115)   (1,925,660)      
Construction in progress 264,823   247,836      
Utility property, plant and equipment, net 4,140,651   4,069,415      
Nonutility property, plant and equipment, less accumulated depreciation 5,293   5,295      
Total property, plant and equipment, net 4,145,944   4,074,710      
Investment in wholly owned subsidiaries, at equity 482,112   722,211      
Current assets            
Cash and cash equivalents 58,819   89,755 70,235    
Restricted cash 2,000   2,000      
Advances to affiliates 110,000   70,500      
Customer accounts receivable, net 143,860   172,747      
Accrued unbilled revenues, net 131,246   136,367      
Other accounts receivable, net 59,341   143,160      
Fuel oil stock, at average cost 112,116   108,228      
Materials and supplies, at average cost 65,354   64,334      
Prepayments and other 50,896   40,767      
Regulatory assets 65,372   58,920      
Total current assets 799,004   886,778      
Other long-term assets            
Operating lease right-of-use assets 32,387   34,856      
Regulatory assets 200,662   189,417      
Other 212,914   134,033      
Total other long-term assets 445,963   358,306      
Total assets 5,873,023   6,042,005      
Capitalization            
Common stock equity 1,192,842   2,409,110 2,371,889   2,344,170
Preferred stock of subsidiaries - not subject to mandatory redemption 22,293   22,293      
Long-term debt, net 1,386,884   1,426,516      
Total capitalization 2,602,019   3,857,919      
Current liabilities            
Current portion of operating lease liabilities 5,804   6,788      
Current portion of long-term debt 39,961          
Accounts payable 146,724   136,102      
Interest and dividends payable 17,001   17,085      
Taxes accrued, including revenue taxes 180,419   211,840      
Regulatory liabilities 10,442   20,013      
Wildfire tort-related claims (Note 2) 1,369,600   75,000      
Other 83,336   90,131      
Total current liabilities 1,853,287   556,959      
Deferred credits and other liabilities            
Operating lease liabilities 31,854   34,262      
Finance lease liabilities 348,341   295,935      
Deferred income taxes 0   280,029      
Regulatory liabilities 830,156   803,404      
Unamortized tax credits 57,247   61,130      
Defined benefit pension and other postretirement benefit plans liability 75,433   74,842      
Other 74,686   77,525      
Total deferred credits and other liabilities 1,417,717   1,627,127      
Total liabilities and shareholders’ equity 5,873,023   6,042,005      
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity            
Current liabilities            
Short-term borrowings from non-affiliates 0   0      
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated            
Utility property, plant and equipment            
Land 5,645   5,645      
Plant and equipment 1,483,570   1,459,639      
Financing lease right-of-use assets 36,074   36,075      
Less accumulated depreciation (676,745)   (666,581)      
Construction in progress 27,641   33,488      
Utility property, plant and equipment, net 876,185   868,266      
Nonutility property, plant and equipment, less accumulated depreciation 115   115      
Total property, plant and equipment, net 876,300   868,381      
Investment in wholly owned subsidiaries, at equity 0   0      
Current assets            
Cash and cash equivalents 18,864   10,658 35,894    
Restricted cash 0   0      
Advances to affiliates 0   0      
Customer accounts receivable, net 33,223   38,216      
Accrued unbilled revenues, net 25,080   25,102      
Other accounts receivable, net 12,802   13,318      
Fuel oil stock, at average cost 13,843   17,968      
Materials and supplies, at average cost 14,154   14,397      
Prepayments and other 5,784   7,724      
Regulatory assets 4,872   5,771      
Total current assets 128,622   133,154      
Other long-term assets            
Operating lease right-of-use assets 24,197   27,470      
Regulatory assets 15,123   13,575      
Other 37,056   36,439      
Total other long-term assets 76,376   77,484      
Total assets 1,081,298   1,079,019      
Capitalization            
Common stock equity 243,878   359,790 349,227   344,720
Preferred stock of subsidiaries - not subject to mandatory redemption 7,000   7,000      
Long-term debt, net 244,409   249,339      
Total capitalization 495,287   616,129      
Current liabilities            
Current portion of operating lease liabilities 7,216   7,025      
Current portion of long-term debt 4,995          
Accounts payable 23,805   29,418      
Interest and dividends payable 3,228   3,098      
Taxes accrued, including revenue taxes 40,640   43,932      
Regulatory liabilities 8,284   8,508      
Wildfire tort-related claims (Note 2) 171,200   0      
Other 28,351   33,240      
Total current liabilities 287,719   125,221      
Deferred credits and other liabilities            
Operating lease liabilities 17,342   20,792      
Finance lease liabilities 34,712   35,043      
Deferred income taxes 7,019   51,661      
Regulatory liabilities 205,042   199,173      
Unamortized tax credits 11,052   11,650      
Defined benefit pension and other postretirement benefit plans liability 0   0      
Other 23,125   19,350      
Total deferred credits and other liabilities 298,292   337,669      
Total liabilities and shareholders’ equity 1,081,298   1,079,019      
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity            
Current liabilities            
Short-term borrowings from non-affiliates 0   0      
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated            
Utility property, plant and equipment            
Land 3,514   3,594      
Plant and equipment 1,396,982   1,374,890      
Financing lease right-of-use assets 50,757   0      
Less accumulated depreciation (608,860)   (605,273)      
Construction in progress 43,739   38,899      
Utility property, plant and equipment, net 886,132   812,110      
Nonutility property, plant and equipment, less accumulated depreciation 1,532   1,532      
Total property, plant and equipment, net 887,664   813,642      
Investment in wholly owned subsidiaries, at equity 0   0      
Current assets            
Cash and cash equivalents 10,860   5,587 37,441    
Restricted cash 0   0      
Advances to affiliates 0   0      
Customer accounts receivable, net 34,232   33,346      
Accrued unbilled revenues, net 22,220   24,175      
Other accounts receivable, net 24,179   32,521      
Fuel oil stock, at average cost 20,132   22,041      
Materials and supplies, at average cost 33,496   35,702      
Prepayments and other 14,203   11,638      
Regulatory assets 9,026   3,762      
Total current assets 168,348   168,772      
Other long-term assets            
Operating lease right-of-use assets 8,156   9,551      
Regulatory assets 27,354   23,359      
Other 35,144   33,129      
Total other long-term assets 70,654   66,039      
Total assets 1,126,666   1,048,453      
Capitalization            
Common stock equity 238,157   362,344 359,161   357,036
Preferred stock of subsidiaries - not subject to mandatory redemption 5,000   5,000      
Long-term debt, net 256,500   258,422      
Total capitalization 499,657   625,766      
Current liabilities            
Current portion of operating lease liabilities 2,882   2,804      
Current portion of long-term debt 1,998          
Accounts payable 24,005   25,520      
Interest and dividends payable 3,394   3,074      
Taxes accrued, including revenue taxes 32,687   37,808      
Regulatory liabilities 5,380   8,038      
Wildfire tort-related claims (Note 2) 171,200   0      
Other 38,149   50,170      
Total current liabilities 389,695   197,914      
Deferred credits and other liabilities            
Operating lease liabilities 5,583   7,044      
Finance lease liabilities 50,178   0      
Deferred income taxes 25,521   67,311      
Regulatory liabilities 116,305   111,554      
Unamortized tax credits 10,932   11,532      
Defined benefit pension and other postretirement benefit plans liability 0   0      
Other 28,795   27,332      
Total deferred credits and other liabilities 237,314   224,773      
Total liabilities and shareholders’ equity 1,126,666   1,048,453      
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity            
Current liabilities            
Short-term borrowings from non-affiliates 110,000   70,500      
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated            
Utility property, plant and equipment            
Land 0   0      
Plant and equipment 0   0      
Financing lease right-of-use assets 0   0      
Less accumulated depreciation 0   0      
Construction in progress 0   0      
Utility property, plant and equipment, net 0   0      
Nonutility property, plant and equipment, less accumulated depreciation 0   0      
Total property, plant and equipment, net 0   0      
Investment in wholly owned subsidiaries, at equity 0   0      
Current assets            
Cash and cash equivalents 77   77 77    
Restricted cash 0   0      
Advances to affiliates 0   0      
Customer accounts receivable, net 0   0      
Accrued unbilled revenues, net 0   0      
Other accounts receivable, net 0   0      
Fuel oil stock, at average cost 0   0      
Materials and supplies, at average cost 0   0      
Prepayments and other 0   0      
Regulatory assets 0   0      
Total current assets 77   77      
Other long-term assets            
Operating lease right-of-use assets 0   0      
Regulatory assets 0   0      
Other 0   0      
Total other long-term assets 0   0      
Total assets 77   77      
Capitalization            
Common stock equity 77   77 $ 77   $ 77
Preferred stock of subsidiaries - not subject to mandatory redemption 0   0      
Long-term debt, net 0   0      
Total capitalization 77   77      
Current liabilities            
Current portion of operating lease liabilities 0   0      
Current portion of long-term debt 0          
Accounts payable 0   0      
Interest and dividends payable 0   0      
Taxes accrued, including revenue taxes 0   0      
Regulatory liabilities 0   0      
Wildfire tort-related claims (Note 2) 0   0      
Other 0   0      
Total current liabilities 0   0      
Deferred credits and other liabilities            
Operating lease liabilities 0   0      
Finance lease liabilities 0   0      
Deferred income taxes 0   0      
Regulatory liabilities 0   0      
Unamortized tax credits 0   0      
Defined benefit pension and other postretirement benefit plans liability 0   0      
Other 0        
Total deferred credits and other liabilities 0   0      
Total liabilities and shareholders’ equity 77   77      
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity            
Current liabilities            
Short-term borrowings from non-affiliates $ 0   $ 0