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Electric utility segment - Condensed consolidating balance sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Utility property, plant and equipment            
Total property, plant and equipment, net $ 5,310,162   $ 5,265,735      
Current assets            
Cash and cash equivalents 247,443   341,421 $ 574,482    
Restricted cash 10,618   17,558 29,376    
Other long-term assets            
Operating lease right-of-use assets 154,720   153,069      
Total assets 15,606,729   15,004,007      
Capitalization            
Common stock equity 2,367,329 $ 2,321,293 2,337,502 2,291,398 $ 2,276,505 $ 2,280,260
Cumulative preferred stock—not subject to mandatory redemption 0   0      
Current liabilities            
Interest and preferred dividends payable 20,284   23,547      
Deferred credits and other liabilities            
Deferred income taxes 384,953   395,089      
Total liabilities and shareholders’ equity 15,606,729   15,004,007      
Hawaiian Electric Consolidated            
Utility property, plant and equipment            
Land 51,612   51,611      
Plant and equipment 7,619,886   7,509,343      
Less accumulated depreciation (2,903,421)   (2,819,079)      
Construction in progress 201,802   188,342      
Utility property, plant and equipment, net 4,969,879   4,930,217      
Nonutility property, plant and equipment, less accumulated depreciation 6,951   6,953      
Total property, plant and equipment, net 4,976,830   4,937,170      
Investment in wholly owned subsidiaries, at equity 0   0      
Current assets            
Cash and cash equivalents 23,666   47,360 63,995    
Restricted cash 8,968   15,966 29,376    
Advances to affiliates 0   0      
Customer accounts receivable, net 152,392   147,832      
Accrued unbilled revenues, net 132,978   101,036      
Other accounts receivable, net 5,168   7,673      
Fuel oil stock, at average cost 102,066   58,238      
Materials and supplies, at average cost 72,959   67,344      
Prepayments and other 31,913   44,083      
Regulatory assets 59,905   30,435      
Total current assets 590,015   519,967      
Other long-term assets            
Operating lease right-of-use assets 131,622   127,654      
Regulatory assets 707,951   736,273      
Other 141,556   136,309      
Total other long-term assets 981,129   1,000,236      
Total assets 6,547,974   6,457,373      
Capitalization            
Common stock equity 2,171,396 $ 2,157,385 2,141,918 2,060,069 $ 2,044,499 2,047,352
Cumulative preferred stock—not subject to mandatory redemption 34,293   34,293      
Long-term debt, net 1,676,043   1,561,302      
Total capitalization 3,881,732   3,737,513      
Current liabilities            
Current portion of operating lease liabilities 68,090   64,730      
Short-term borrowings from non-affiliates 37,999   49,979      
Short-term borrowings from affiliate 0   0      
Accounts payable 131,633   133,849      
Interest and preferred dividends payable 17,827   20,350      
Taxes accrued, including revenue taxes 175,814   192,524      
Regulatory liabilities 31,713   37,301      
Other 60,951   74,262      
Total current liabilities 524,027   572,995      
Deferred credits and other liabilities            
Operating lease liabilities 76,066   69,494      
Deferred income taxes 393,275   397,798      
Regulatory liabilities 934,764   922,485      
Unamortized tax credits 108,286   111,915      
Defined benefit pension and other postretirement benefit plans liability 514,075   530,532      
Other 115,749   114,641      
Total deferred credits and other liabilities 2,142,215   2,146,865      
Total liabilities and shareholders’ equity 6,547,974   6,457,373      
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric Industries, Inc.            
Utility property, plant and equipment            
Land 42,412   42,411      
Plant and equipment 5,030,706   4,960,470      
Less accumulated depreciation (1,735,717)   (1,677,256)      
Construction in progress 159,300   143,616      
Utility property, plant and equipment, net 3,496,701   3,469,241      
Nonutility property, plant and equipment, less accumulated depreciation 5,304   5,306      
Total property, plant and equipment, net 3,502,005   3,474,547      
Investment in wholly owned subsidiaries, at equity 635,296   626,890      
Current assets            
Cash and cash equivalents 17,367   42,205 55,170    
Restricted cash 8,968   15,966 29,376    
Advances to affiliates 3,800   26,700      
Customer accounts receivable, net 104,190   102,736      
Accrued unbilled revenues, net 98,422   73,628      
Other accounts receivable, net 13,370   17,984      
Fuel oil stock, at average cost 74,673   38,777      
Materials and supplies, at average cost 42,641   38,786      
Prepayments and other 25,319   34,306      
Regulatory assets 47,934   22,095      
Total current assets 436,684   413,183      
Other long-term assets            
Operating lease right-of-use assets 107,191   125,858      
Regulatory assets 494,195   513,192      
Other 110,278   98,307      
Total other long-term assets 711,664   737,357      
Total assets 5,285,649   5,251,977      
Capitalization            
Common stock equity 2,171,396   2,141,918 2,060,069   2,047,352
Cumulative preferred stock—not subject to mandatory redemption 22,293   22,293      
Long-term debt, net 1,176,353   1,116,426      
Total capitalization 3,370,042   3,280,637      
Current liabilities            
Current portion of operating lease liabilities 64,725   64,599      
Short-term borrowings from non-affiliates 37,999   49,979      
Short-term borrowings from affiliate 0   0      
Accounts payable 90,840   97,102      
Interest and preferred dividends payable 12,801   14,480      
Taxes accrued, including revenue taxes 122,268   135,018      
Regulatory liabilities 18,306   20,224      
Other 50,487   57,926      
Total current liabilities 397,426   439,328      
Deferred credits and other liabilities            
Operating lease liabilities 54,992   67,824      
Deferred income taxes 280,920   282,685      
Regulatory liabilities 666,554   656,270      
Unamortized tax credits 79,867   82,563      
Defined benefit pension and other postretirement benefit plans liability 367,530   373,112      
Other 68,318   69,558      
Total deferred credits and other liabilities 1,518,181   1,532,012      
Total liabilities and shareholders’ equity 5,285,649   5,251,977      
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light            
Utility property, plant and equipment            
Land 5,606   5,606      
Plant and equipment 1,368,603   1,352,885      
Less accumulated depreciation (612,065)   (597,606)      
Construction in progress 12,961   13,043      
Utility property, plant and equipment, net 775,105   773,928      
Nonutility property, plant and equipment, less accumulated depreciation 115   115      
Total property, plant and equipment, net 775,220   774,043      
Investment in wholly owned subsidiaries, at equity 0   0      
Current assets            
Cash and cash equivalents 3,754   3,046 4,594    
Restricted cash 0   0 0    
Advances to affiliates 0   0      
Customer accounts receivable, net 25,316   23,989      
Accrued unbilled revenues, net 17,169   13,631      
Other accounts receivable, net 4,036   3,028      
Fuel oil stock, at average cost 11,193   8,471      
Materials and supplies, at average cost 10,326   9,896      
Prepayments and other 4,510   5,197      
Regulatory assets 3,911   1,954      
Total current assets 80,215   69,212      
Other long-term assets            
Operating lease right-of-use assets 24,095   1,443      
Regulatory assets 109,656   114,461      
Other 18,970   17,992      
Total other long-term assets 152,721   133,896      
Total assets 1,008,156   977,151      
Capitalization            
Common stock equity 322,451   317,451 304,088   298,998
Cumulative preferred stock—not subject to mandatory redemption 7,000   7,000      
Long-term debt, net 246,335   216,447      
Total capitalization 575,786   540,898      
Current liabilities            
Current portion of operating lease liabilities 3,331   98      
Short-term borrowings from non-affiliates 0   0      
Short-term borrowings from affiliate 3,100   18,800      
Accounts payable 18,624   19,570      
Interest and preferred dividends payable 2,694   3,138      
Taxes accrued, including revenue taxes 27,743   29,869      
Regulatory liabilities 5,653   8,785      
Other 11,508   13,851      
Total current liabilities 72,653   94,111      
Deferred credits and other liabilities            
Operating lease liabilities 20,764   1,344      
Deferred income taxes 53,115   54,108      
Regulatory liabilities 175,771   173,938      
Unamortized tax credits 14,890   15,363      
Defined benefit pension and other postretirement benefit plans liability 75,010   77,679      
Other 20,167   19,710      
Total deferred credits and other liabilities 359,717   342,142      
Total liabilities and shareholders’ equity 1,008,156   977,151      
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric            
Utility property, plant and equipment            
Land 3,594   3,594      
Plant and equipment 1,220,577   1,195,988      
Less accumulated depreciation (555,639)   (544,217)      
Construction in progress 29,541   31,683      
Utility property, plant and equipment, net 698,073   687,048      
Nonutility property, plant and equipment, less accumulated depreciation 1,532   1,532      
Total property, plant and equipment, net 699,605   688,580      
Investment in wholly owned subsidiaries, at equity 0   0      
Current assets            
Cash and cash equivalents 2,468   2,032 4,130    
Restricted cash 0   0 0    
Advances to affiliates 0   0      
Customer accounts receivable, net 22,886   21,107      
Accrued unbilled revenues, net 17,387   13,777      
Other accounts receivable, net 4,661   2,856      
Fuel oil stock, at average cost 16,200   10,990      
Materials and supplies, at average cost 19,992   18,662      
Prepayments and other 2,084   4,580      
Regulatory assets 8,060   6,386      
Total current assets 93,738   80,390      
Other long-term assets            
Operating lease right-of-use assets 336   353      
Regulatory assets 104,100   108,620      
Other 18,290   20,010      
Total other long-term assets 122,726   128,983      
Total assets 916,069   897,953      
Capitalization            
Common stock equity 312,768   309,363 295,009   292,870
Cumulative preferred stock—not subject to mandatory redemption 5,000   5,000      
Long-term debt, net 253,355   228,429      
Total capitalization 571,123   542,792      
Current liabilities            
Current portion of operating lease liabilities 34   33      
Short-term borrowings from non-affiliates 0   0      
Short-term borrowings from affiliate 700   7,900      
Accounts payable 22,169   17,177      
Interest and preferred dividends payable 2,333   2,790      
Taxes accrued, including revenue taxes 25,803   27,637      
Regulatory liabilities 7,754   8,292      
Other 16,004   18,621      
Total current liabilities 74,797   82,450      
Deferred credits and other liabilities            
Operating lease liabilities 310   326      
Deferred income taxes 59,240   61,005      
Regulatory liabilities 92,439   92,277      
Unamortized tax credits 13,529   13,989      
Defined benefit pension and other postretirement benefit plans liability 77,367   79,741      
Other 27,264   25,373      
Total deferred credits and other liabilities 270,149   272,711      
Total liabilities and shareholders’ equity 916,069   897,953      
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiaries            
Utility property, plant and equipment            
Land 0   0      
Plant and equipment 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   77 101    
Restricted cash 0   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   77 101   101
Cumulative preferred stock—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      
Short-term borrowings from non-affiliates 0   0      
Short-term borrowings from affiliate 0   0      
Accounts payable 0   0      
Interest and preferred dividends payable 0   0      
Taxes accrued, including revenue taxes 0   0      
Regulatory liabilities 0   0      
Other 0   0      
Total current liabilities 0   0      
Deferred credits and other liabilities            
Operating 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   0      
Total deferred credits and other liabilities 0   0      
Total liabilities and shareholders’ equity 77   77      
Hawaiian Electric Consolidated | Consolidating adjustments            
Utility property, plant and equipment            
Land 0   0      
Plant and equipment 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 (635,296)   (626,890)      
Current assets            
Cash and cash equivalents 0   0 0    
Restricted cash 0   0 0    
Advances to affiliates (3,800)   (26,700)      
Customer accounts receivable, net 0   0      
Accrued unbilled revenues, net 0   0      
Other accounts receivable, net (16,899)   (16,195)      
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 (20,699)   (42,895)      
Other long-term assets            
Operating lease right-of-use assets 0   0      
Regulatory assets 0   0      
Other (5,982)   0      
Total other long-term assets (5,982)   0      
Total assets (661,977)   (669,785)      
Capitalization            
Common stock equity (635,296)   (626,891) $ (599,198)   $ (591,969)
Cumulative preferred stock—not subject to mandatory redemption 0   0      
Long-term debt, net 0   0      
Total capitalization (635,296)   (626,891)      
Current liabilities            
Current portion of operating lease liabilities 0   0      
Short-term borrowings from non-affiliates 0   0      
Short-term borrowings from affiliate (3,800)   (26,700)      
Accounts payable 0   0      
Interest and preferred dividends payable (1)   (58)      
Taxes accrued, including revenue taxes 0   0      
Regulatory liabilities 0   0      
Other (17,048)   (16,136)      
Total current liabilities (20,849)   (42,894)      
Deferred credits and other liabilities            
Operating 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 (5,832)   0      
Other 0   0      
Total deferred credits and other liabilities (5,832)   0      
Total liabilities and shareholders’ equity $ (661,977)   $ (669,785)