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Electric utility segment - Condensed consolidating balance sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Utility property, plant and equipment        
Total property, plant and equipment, net $ 4,611,949 $ 4,460,248    
Current assets        
Cash and cash equivalents 254,665 261,881 $ 210,381 $ 278,452
Other long-term assets        
Total assets 12,884,104 12,534,160    
Capitalization        
Common stock equity 2,103,018 2,097,386 2,075,029 2,066,753
Cumulative preferred stock—not subject to mandatory redemption 0 0    
Current liabilities        
Interest and preferred dividends payable 27,594 25,837    
Deferred credits and other liabilities        
Deferred income taxes 375,832 388,430    
Total liabilities and shareholders’ equity 12,884,104 12,534,160    
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 (561,764) (557,013)    
Current assets        
Cash and cash equivalents 0 0 0 0
Advances to affiliates (6,600) (12,000)    
Customer accounts receivable, net 0 0    
Accrued unbilled revenues, net 0 0    
Other accounts receivable, net (7,446) (7,691)    
Fuel oil stock, at average cost 0 0    
Materials and supplies, at average cost 0 0    
Prepayments and other (1,514) 0    
Regulatory assets 0 0    
Total current assets (15,560) (19,691)    
Other long-term assets        
Regulatory assets 0 0    
Other 0 0    
Total other long-term assets 0 0    
Total assets (577,324) (576,704)    
Capitalization        
Common stock equity (561,764) (557,013) (553,764) (550,946)
Cumulative preferred stock—not subject to mandatory redemption 0 0    
Long-term debt, net 0 0    
Total capitalization (561,764) (557,013)    
Current liabilities        
Current portion of long-term debt 0 0    
Short-term borrowings from non-affiliates 0 0    
Short-term borrowings from affiliate (6,600) (12,000)    
Accounts payable 0 0    
Interest and preferred dividends payable (14) (11)    
Taxes accrued, including revenue taxes (1,514) 0    
Regulatory liabilities 0 0    
Other (7,432) (7,680)    
Total current liabilities (15,560) (19,691)    
Deferred credits and other liabilities        
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 (577,324) (576,704)    
Hawaiian Electric (parent only) | Reportable Legal Entities        
Utility property, plant and equipment        
Land 44,023 43,972    
Plant and equipment 4,363,195 4,140,892    
Less accumulated depreciation (1,491,505) (1,451,612)    
Construction in progress 127,343 231,571    
Utility property, plant and equipment, net 3,043,056 2,964,823    
Nonutility property, plant and equipment, less accumulated depreciation 5,934 5,933    
Total property, plant and equipment, net 3,048,990 2,970,756    
Investment in wholly owned subsidiaries, at equity 561,764 557,013    
Current assets        
Cash and cash equivalents 13,922 2,059 29,988 61,388
Advances to affiliates 5,600 0    
Customer accounts receivable, net 109,285 86,987    
Accrued unbilled revenues, net 80,239 77,176    
Other accounts receivable, net 10,657 11,376    
Fuel oil stock, at average cost 74,485 64,972    
Materials and supplies, at average cost 31,077 28,325    
Prepayments and other 21,482 17,928    
Regulatory assets 88,581 76,203    
Total current assets 435,328 365,026    
Other long-term assets        
Regulatory assets 538,925 557,464    
Other 71,486 60,157    
Total other long-term assets 610,411 617,621    
Total assets 4,656,493 4,510,416    
Capitalization        
Common stock equity 1,852,324 1,845,283 1,803,506 1,799,787
Cumulative preferred stock—not subject to mandatory redemption 22,293 22,293    
Long-term debt, net 999,915 924,979    
Total capitalization 2,874,532 2,792,555    
Current liabilities        
Current portion of long-term debt 29,990 29,978    
Short-term borrowings from non-affiliates 91,880 4,999    
Short-term borrowings from affiliate 1,000 12,000    
Accounts payable 115,806 121,328    
Interest and preferred dividends payable 15,743 15,677    
Taxes accrued, including revenue taxes 120,513 133,839    
Regulatory liabilities 2,751 607    
Other 42,449 43,121    
Total current liabilities 420,132 361,549    
Deferred credits and other liabilities        
Deferred income taxes 277,599 281,223    
Regulatory liabilities 627,369 613,329    
Unamortized tax credits 60,893 59,039    
Defined benefit pension and other postretirement benefit plans liability 330,356 340,983    
Other 65,612 61,738    
Total deferred credits and other liabilities 1,361,829 1,356,312    
Total liabilities and shareholders’ equity 4,656,493 4,510,416    
HELCO | Reportable Legal Entities        
Utility property, plant and equipment        
Land 5,876 6,189    
Plant and equipment 1,217,147 1,206,776    
Less accumulated depreciation (536,210) (528,024)    
Construction in progress 10,154 8,182    
Utility property, plant and equipment, net 696,967 693,123    
Nonutility property, plant and equipment, less accumulated depreciation 115 115    
Total property, plant and equipment, net 697,082 693,238    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 4,516 4,025 7,104 10,749
Advances to affiliates 1,000 0    
Customer accounts receivable, net 24,005 22,510    
Accrued unbilled revenues, net 15,243 15,940    
Other accounts receivable, net 2,561 2,268    
Fuel oil stock, at average cost 12,632 8,698    
Materials and supplies, at average cost 8,600 8,041    
Prepayments and other 6,329 4,514    
Regulatory assets 6,353 5,038    
Total current assets 81,239 71,034    
Other long-term assets        
Regulatory assets 118,000 122,783    
Other 19,378 16,311    
Total other long-term assets 137,378 139,094    
Total assets 915,699 903,366    
Capitalization        
Common stock equity 288,865 286,647 291,760 291,291
Cumulative preferred stock—not subject to mandatory redemption 7,000 7,000    
Long-term debt, net 217,699 202,701    
Total capitalization 513,564 496,348    
Current liabilities        
Current portion of long-term debt 10,996 10,992    
Short-term borrowings from non-affiliates 0 0    
Short-term borrowings from affiliate 0 0    
Accounts payable 17,405 17,855    
Interest and preferred dividends payable 4,203 4,174    
Taxes accrued, including revenue taxes 27,353 34,950    
Regulatory liabilities 2,499 1,245    
Other 10,223 9,818    
Total current liabilities 72,679 79,034    
Deferred credits and other liabilities        
Deferred income taxes 54,505 56,955    
Regulatory liabilities 173,305 169,139    
Unamortized tax credits 16,463 16,167    
Defined benefit pension and other postretirement benefit plans liability 64,175 66,447    
Other 21,008 19,276    
Total deferred credits and other liabilities 329,456 327,984    
Total liabilities and shareholders’ equity 915,699 903,366    
Maui Electric | Reportable Legal Entities        
Utility property, plant and equipment        
Land 3,015 3,016    
Plant and equipment 1,072,640 1,053,372    
Less accumulated depreciation (506,713) (496,716)    
Construction in progress 28,111 23,341    
Utility property, plant and equipment, net 597,053 583,013    
Nonutility property, plant and equipment, less accumulated depreciation 1,532 1,532    
Total property, plant and equipment, net 598,585 584,545    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 2,321 6,332 5,389 2,048
Advances to affiliates 0 12,000    
Customer accounts receivable, net 23,970 18,392    
Accrued unbilled revenues, net 15,357 13,938    
Other accounts receivable, net 1,124 1,210    
Fuel oil stock, at average cost 19,899 13,203    
Materials and supplies, at average cost 18,264 18,031    
Prepayments and other 2,943 2,913    
Regulatory assets 8,632 7,149    
Total current assets 92,510 93,168    
Other long-term assets        
Regulatory assets 99,919 100,660    
Other 17,731 15,061    
Total other long-term assets 117,650 115,721    
Total assets 808,745 793,434    
Capitalization        
Common stock equity 272,798 270,265 261,903 259,554
Cumulative preferred stock—not subject to mandatory redemption 5,000 5,000    
Long-term debt, net 200,860 190,836    
Total capitalization 478,658 466,101    
Current liabilities        
Current portion of long-term debt 8,997 8,993    
Short-term borrowings from non-affiliates 0 0    
Short-term borrowings from affiliate 5,600 0    
Accounts payable 20,548 20,427    
Interest and preferred dividends payable 2,752 2,735    
Taxes accrued, including revenue taxes 25,711 30,312    
Regulatory liabilities 4,537 1,549    
Other 13,963 14,197    
Total current liabilities 82,108 78,213    
Deferred credits and other liabilities        
Deferred income taxes 56,771 55,863    
Regulatory liabilities 94,755 94,901    
Unamortized tax credits 15,442 15,163    
Defined benefit pension and other postretirement benefit plans liability 63,422 65,518    
Other 17,589 17,675    
Total deferred credits and other liabilities 247,979 249,120    
Total liabilities and shareholders’ equity 808,745 793,434    
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 101 101 101 101
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 101 101    
Other long-term assets        
Regulatory assets 0 0    
Other 0 0    
Total other long-term assets 0 0    
Total assets 101 101    
Capitalization        
Common stock equity 101 101 101 101
Cumulative preferred stock—not subject to mandatory redemption 0 0    
Long-term debt, net 0 0    
Total capitalization 101 101    
Current liabilities        
Current portion of long-term debt 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        
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 101 101    
Hawaiian Electric Company, Inc. and Subsidiaries        
Utility property, plant and equipment        
Land 52,914 53,177    
Plant and equipment 6,652,982 6,401,040    
Less accumulated depreciation (2,534,428) (2,476,352)    
Construction in progress 165,608 263,094    
Utility property, plant and equipment, net 4,337,076 4,240,959    
Nonutility property, plant and equipment, less accumulated depreciation 7,581 7,580    
Total property, plant and equipment, net 4,344,657 4,248,539    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 20,860 12,517 42,582 74,286
Advances to affiliates 0 0    
Customer accounts receivable, net 157,260 127,889    
Accrued unbilled revenues, net 110,839 107,054    
Other accounts receivable, net 6,896 7,163    
Fuel oil stock, at average cost 107,016 86,873    
Materials and supplies, at average cost 57,941 54,397    
Prepayments and other 29,240 25,355    
Regulatory assets 103,566 88,390    
Total current assets 593,618 509,638    
Other long-term assets        
Regulatory assets 756,844 780,907    
Other 108,595 91,529    
Total other long-term assets 865,439 872,436    
Total assets 5,803,714 5,630,613    
Capitalization        
Common stock equity 1,852,324 1,845,283 $ 1,803,506 $ 1,799,787
Cumulative preferred stock—not subject to mandatory redemption 34,293 34,293    
Long-term debt, net 1,418,474 1,318,516    
Total capitalization 3,305,091 3,198,092    
Current liabilities        
Current portion of long-term debt 49,983 49,963    
Short-term borrowings from non-affiliates 91,880 4,999    
Short-term borrowings from affiliate 0 0    
Accounts payable 153,759 159,610    
Interest and preferred dividends payable 22,684 22,575    
Taxes accrued, including revenue taxes 172,063 199,101    
Regulatory liabilities 9,787 3,401    
Other 59,203 59,456    
Total current liabilities 559,359 499,105    
Deferred credits and other liabilities        
Deferred income taxes 388,875 394,041    
Regulatory liabilities 895,429 877,369    
Unamortized tax credits 92,798 90,369    
Defined benefit pension and other postretirement benefit plans liability 457,953 472,948    
Other 104,209 98,689    
Total deferred credits and other liabilities 1,939,264 1,933,416    
Total liabilities and shareholders’ equity $ 5,803,714 $ 5,630,613