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Electric utility segment - Condensed consolidating balance sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Utility property, plant and equipment        
Total property, plant and equipment, net $ 5,283,768 $ 5,265,735    
Current assets        
Cash and cash equivalents 277,579 341,421 $ 205,514  
Restricted cash 14,067 17,558 30,902  
Other long-term assets        
Operating lease right-of-use assets 162,713 153,069    
Total assets 15,358,673 15,004,007    
Capitalization        
Common stock equity 2,321,293 2,337,502 2,276,505 $ 2,280,260
Cumulative preferred stock—not subject to mandatory redemption 0 0    
Current liabilities        
Interest and preferred dividends payable 32,405 23,547    
Deferred credits and other liabilities        
Deferred income taxes 380,365 395,089    
Total liabilities and shareholders’ equity 15,358,673 15,004,007    
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 (631,976) (626,890)    
Current assets        
Cash and cash equivalents 0 0 0  
Restricted cash 0 0 0  
Advances to affiliates   (26,700)    
Customer accounts receivable, net 0 0    
Accrued unbilled revenues, net 0 0    
Other accounts receivable, net (14,470) (16,195)    
Fuel oil stock, at average cost 0 0    
Materials and supplies, at average cost 0 0    
Prepayments and other (675) 0    
Regulatory assets 0 0    
Total current assets (15,145) (42,895)    
Other long-term assets        
Operating lease right-of-use assets 0 0    
Regulatory assets 0 0    
Other (6,162) 0    
Total other long-term assets (6,162) 0    
Total assets (653,283) (669,785)    
Capitalization        
Common stock equity (631,976) (626,891) (593,097) (591,969)
Cumulative preferred stock—not subject to mandatory redemption 0 0    
Long-term debt, net 0 0    
Total capitalization (631,976) (626,891)    
Current liabilities        
Current portion of operating lease liabilities 0 0    
Short-term borrowings from non-affiliates   0    
Short-term borrowings from affiliate   (26,700)    
Accounts payable 0 0    
Interest and preferred dividends payable (1) (58)    
Taxes accrued, including revenue taxes (675) 0    
Regulatory liabilities 0 0    
Other (14,618) (16,136)    
Total current liabilities (15,294) (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 (6,013) 0    
Other 0 0    
Total deferred credits and other liabilities (6,013) 0    
Total liabilities and shareholders’ equity (653,283) (669,785)    
Hawaiian Electric (parent only) | Reportable Legal Entities        
Utility property, plant and equipment        
Land 42,411 42,411    
Plant and equipment 4,986,417 4,960,470    
Less accumulated depreciation (1,706,529) (1,677,256)    
Construction in progress 160,331 143,616    
Utility property, plant and equipment, net 3,482,630 3,469,241    
Nonutility property, plant and equipment, less accumulated depreciation 5,305 5,306    
Total property, plant and equipment, net 3,487,935 3,474,547    
Investment in wholly owned subsidiaries, at equity 631,976 626,890    
Current assets        
Cash and cash equivalents 29,727 42,205 4,589  
Restricted cash 11,506 15,966 30,902  
Advances to affiliates   26,700    
Customer accounts receivable, net 101,605 102,736    
Accrued unbilled revenues, net 72,784 73,628    
Other accounts receivable, net 12,967 17,984    
Fuel oil stock, at average cost 51,894 38,777    
Materials and supplies, at average cost 40,395 38,786    
Prepayments and other 29,769 34,306    
Regulatory assets 42,852 22,095    
Total current assets 393,499 413,183    
Other long-term assets        
Operating lease right-of-use assets 123,992 125,858    
Regulatory assets 501,393 513,192    
Other 102,767 98,307    
Total other long-term assets 728,152 737,357    
Total assets 5,241,562 5,251,977    
Capitalization        
Common stock equity 2,157,385 2,141,918 2,044,499 2,047,352
Cumulative preferred stock—not subject to mandatory redemption 22,293 22,293    
Long-term debt, net 1,176,229 1,116,426    
Total capitalization 3,355,907 3,280,637    
Current liabilities        
Current portion of operating lease liabilities 64,423 64,599    
Short-term borrowings from non-affiliates   49,979    
Short-term borrowings from affiliate   0    
Accounts payable 87,437 97,102    
Interest and preferred dividends payable 20,075 14,480    
Taxes accrued, including revenue taxes 107,552 135,018    
Regulatory liabilities 17,000 20,224    
Other 55,478 57,926    
Total current liabilities 351,965 439,328    
Deferred credits and other liabilities        
Operating lease liabilities 71,431 67,824    
Deferred income taxes 282,513 282,685    
Regulatory liabilities 658,584 656,270    
Unamortized tax credits 81,297 82,563    
Defined benefit pension and other postretirement benefit plans liability 373,376 373,112    
Other 66,489 69,558    
Total deferred credits and other liabilities 1,533,690 1,532,012    
Total liabilities and shareholders’ equity 5,241,562 5,251,977    
Hawaii Electric Light | Reportable Legal Entities        
Utility property, plant and equipment        
Land 5,606 5,606    
Plant and equipment 1,358,367 1,352,885    
Less accumulated depreciation (604,021) (597,606)    
Construction in progress 13,927 13,043    
Utility property, plant and equipment, net 773,879 773,928    
Nonutility property, plant and equipment, less accumulated depreciation 115 115    
Total property, plant and equipment, net 773,994 774,043    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 7,730 3,046 4,654  
Restricted cash 0 0 0  
Advances to affiliates   0    
Customer accounts receivable, net 21,358 23,989    
Accrued unbilled revenues, net 14,911 13,631    
Other accounts receivable, net 3,006 3,028    
Fuel oil stock, at average cost 9,981 8,471    
Materials and supplies, at average cost 9,873 9,896    
Prepayments and other 3,534 5,197    
Regulatory assets 2,840 1,954    
Total current assets 73,233 69,212    
Other long-term assets        
Operating lease right-of-use assets 14,198 1,443    
Regulatory assets 111,700 114,461    
Other 18,591 17,992    
Total other long-term assets 144,489 133,896    
Total assets 991,716 977,151    
Capitalization        
Common stock equity 320,494 317,451 300,986 298,998
Cumulative preferred stock—not subject to mandatory redemption 7,000 7,000    
Long-term debt, net 246,310 216,447    
Total capitalization 573,804 540,898    
Current liabilities        
Current portion of operating lease liabilities 1,844 98    
Short-term borrowings from non-affiliates   0    
Short-term borrowings from affiliate   18,800    
Accounts payable 16,037 19,570    
Interest and preferred dividends payable 3,698 3,138    
Taxes accrued, including revenue taxes 25,372 29,869    
Regulatory liabilities 5,901 8,785    
Other 11,951 13,851    
Total current liabilities 64,803 94,111    
Deferred credits and other liabilities        
Operating lease liabilities 12,353 1,344    
Deferred income taxes 53,582 54,108    
Regulatory liabilities 174,820 173,938    
Unamortized tax credits 15,126 15,363    
Defined benefit pension and other postretirement benefit plans liability 76,357 77,679    
Other 20,871 19,710    
Total deferred credits and other liabilities 353,109 342,142    
Total liabilities and shareholders’ equity 991,716 977,151    
Maui Electric | Reportable Legal Entities        
Utility property, plant and equipment        
Land 3,594 3,594    
Plant and equipment 1,207,095 1,195,988    
Less accumulated depreciation (549,169) (544,217)    
Construction in progress 29,730 31,683    
Utility property, plant and equipment, net 691,250 687,048    
Nonutility property, plant and equipment, less accumulated depreciation 1,532 1,532    
Total property, plant and equipment, net 692,782 688,580    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 14,209 2,032 3,065  
Restricted cash 0 0 0  
Advances to affiliates   0    
Customer accounts receivable, net 18,686 21,107    
Accrued unbilled revenues, net 14,118 13,777    
Other accounts receivable, net 3,570 2,856    
Fuel oil stock, at average cost 12,813 10,990    
Materials and supplies, at average cost 19,458 18,662    
Prepayments and other 3,791 4,580    
Regulatory assets 8,630 6,386    
Total current assets 95,275 80,390    
Other long-term assets        
Operating lease right-of-use assets 344 353    
Regulatory assets 106,011 108,620    
Other 20,424 20,010    
Total other long-term assets 126,779 128,983    
Total assets 914,836 897,953    
Capitalization        
Common stock equity 311,405 309,363 292,010 292,870
Cumulative preferred stock—not subject to mandatory redemption 5,000 5,000    
Long-term debt, net 253,324 228,429    
Total capitalization 569,729 542,792    
Current liabilities        
Current portion of operating lease liabilities 34 33    
Short-term borrowings from non-affiliates   0    
Short-term borrowings from affiliate   7,900    
Accounts payable 19,725 17,177    
Interest and preferred dividends payable 4,400 2,790    
Taxes accrued, including revenue taxes 22,876 27,637    
Regulatory liabilities 7,469 8,292    
Other 17,189 18,621    
Total current liabilities 71,693 82,450    
Deferred credits and other liabilities        
Operating lease liabilities 318 326    
Deferred income taxes 60,663 61,005    
Regulatory liabilities 92,365 92,277    
Unamortized tax credits 13,758 13,989    
Defined benefit pension and other postretirement benefit plans liability 78,566 79,741    
Other 27,744 25,373    
Total deferred credits and other liabilities 273,414 272,711    
Total liabilities and shareholders’ equity 914,836 897,953    
Other subsidiaries | Reportable Legal Entities        
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    
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    
Short-term borrowings from affiliate   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        
Utility property, plant and equipment        
Land 51,611 51,611    
Plant and equipment 7,551,879 7,509,343    
Less accumulated depreciation (2,859,719) (2,819,079)    
Construction in progress 203,988 188,342    
Utility property, plant and equipment, net 4,947,759 4,930,217    
Nonutility property, plant and equipment, less accumulated depreciation 6,952 6,953    
Total property, plant and equipment, net 4,954,711 4,937,170    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 51,743 47,360 12,409  
Restricted cash 11,506 15,966 30,902  
Advances to affiliates   0    
Customer accounts receivable, net 141,649 147,832    
Accrued unbilled revenues, net 101,813 101,036    
Other accounts receivable, net 5,073 7,673    
Fuel oil stock, at average cost 74,688 58,238    
Materials and supplies, at average cost 69,726 67,344    
Prepayments and other 36,419 44,083    
Regulatory assets 54,322 30,435    
Total current assets 546,939 519,967    
Other long-term assets        
Operating lease right-of-use assets 138,534 127,654    
Regulatory assets 719,104 736,273    
Other 135,620 136,309    
Total other long-term assets 993,258 1,000,236    
Total assets 6,494,908 6,457,373    
Capitalization        
Common stock equity 2,157,385 2,141,918 $ 2,044,499 $ 2,047,352
Cumulative preferred stock—not subject to mandatory redemption 34,293 34,293    
Long-term debt, net 1,675,863 1,561,302    
Total capitalization 3,867,541 3,737,513    
Current liabilities        
Current portion of operating lease liabilities 66,301 64,730    
Short-term borrowings from non-affiliates 0 49,979    
Short-term borrowings from affiliate   0    
Accounts payable 123,199 133,849    
Interest and preferred dividends payable 28,172 20,350    
Taxes accrued, including revenue taxes 155,125 192,524    
Regulatory liabilities 30,370 37,301    
Other 70,000 74,262    
Total current liabilities 473,167 572,995    
Deferred credits and other liabilities        
Operating lease liabilities 84,102 69,494    
Deferred income taxes 396,758 397,798    
Regulatory liabilities 925,769 922,485    
Unamortized tax credits 110,181 111,915    
Defined benefit pension and other postretirement benefit plans liability 522,286 530,532    
Other 115,104 114,641    
Total deferred credits and other liabilities 2,154,200 2,146,865    
Total liabilities and shareholders’ equity $ 6,494,908 $ 6,457,373