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Electric utility segment - Condensed consolidating balance sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Utility property, plant and equipment        
Total property, plant and equipment, net $ 4,813,875 $ 4,603,465    
Current assets        
Cash and cash equivalents 202,173 278,452 $ 284,355 $ 300,478
Other long-term assets        
Total assets 12,742,850 12,425,506    
Capitalization        
Common stock equity 2,103,022 2,066,753 2,068,388 1,927,640
Cumulative preferred stock—not subject to mandatory redemption 0 0    
Current liabilities        
Interest and preferred dividends payable 26,484 25,225    
Deferred credits and other liabilities        
Deferred income taxes 756,814 728,806    
Contributions in aid of construction 565,118 543,525    
Total liabilities and shareholders’ equity 12,742,850 12,425,506    
Hawaiian Electric Company        
Utility property, plant and equipment        
Land 44,706 43,956    
Plant and equipment 4,368,428 4,241,060    
Less accumulated depreciation (1,441,963) (1,382,972)    
Construction in progress 262,098 180,194    
Utility property, plant and equipment, net 3,233,269 3,082,238    
Nonutility property, plant and equipment, less accumulated depreciation 5,762 5,760    
Total property, plant and equipment, net 3,239,031 3,087,998    
Investment in wholly owned subsidiaries, at equity 559,671 550,946    
Current assets        
Cash and cash equivalents 3,454 61,388 9,821 16,281
Advances to affiliates 0 0    
Customer accounts receivable, net 92,961 86,373    
Accrued unbilled revenues, net 80,644 65,821    
Other accounts receivable, net 7,402 7,652    
Fuel oil stock, at average cost 40,460 47,239    
Materials and supplies, at average cost 28,865 29,928    
Prepayments and other 22,197 16,502    
Regulatory assets 63,608 60,185    
Total current assets 339,591 375,088    
Other long-term assets        
Regulatory assets 639,689 662,232    
Unamortized debt expense 472 151    
Other 50,424 43,743    
Total other long-term assets 690,585 706,126    
Total assets 4,828,878 4,720,158    
Capitalization        
Common stock equity 1,829,075 1,799,787 1,766,727 1,728,325
Cumulative preferred stock—not subject to mandatory redemption 22,293 22,293    
Long-term debt, net 915,097 915,437    
Total capitalization 2,766,465 2,737,517    
Current liabilities        
Short-term borrowings from non-affiliates 6,000      
Short-term borrowings from affiliate 10,600 13,500    
Accounts payable 94,618 86,369    
Interest and preferred dividends payable 17,870 15,761    
Taxes accrued 134,935 120,176    
Regulatory liabilities 576 0    
Other 45,662 41,352    
Total current liabilities 310,261 277,158    
Deferred credits and other liabilities        
Deferred income taxes 540,857 524,433    
Regulatory liabilities 328,530 281,112    
Unamortized tax credits 57,577 57,844    
Defined benefit pension and other postretirement benefit plans liability 431,191 444,458    
Other 27,097 49,191    
Total deferred credits and other liabilities 1,385,252 1,357,038    
Contributions in aid of construction 366,900 348,445    
Total liabilities and shareholders’ equity 4,828,878 4,720,158    
HELCO        
Utility property, plant and equipment        
Land 6,191 6,181    
Plant and equipment 1,278,884 1,255,185    
Less accumulated depreciation (524,759) (507,666)    
Construction in progress 16,459 12,510    
Utility property, plant and equipment, net 776,775 766,210    
Nonutility property, plant and equipment, less accumulated depreciation 115 115    
Total property, plant and equipment, net 776,890 766,325    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 4,714 10,749 7,008 2,682
Advances to affiliates 6,600 3,500    
Customer accounts receivable, net 20,830 20,055    
Accrued unbilled revenues, net 15,145 13,564    
Other accounts receivable, net 2,797 2,445    
Fuel oil stock, at average cost 8,034 8,229    
Materials and supplies, at average cost 8,960 7,380    
Prepayments and other 4,183 5,352    
Regulatory assets 4,341 3,483    
Total current assets 75,604 74,757    
Other long-term assets        
Regulatory assets 118,655 120,863    
Unamortized debt expense 83 23    
Other 14,981 13,573    
Total other long-term assets 133,719 134,459    
Total assets 986,213 975,541    
Capitalization        
Common stock equity 294,319 291,291 299,276 292,702
Cumulative preferred stock—not subject to mandatory redemption 7,000 7,000    
Long-term debt, net 213,658 213,703    
Total capitalization 514,977 511,994    
Current liabilities        
Short-term borrowings from non-affiliates 0      
Short-term borrowings from affiliate 0 0    
Accounts payable 15,291 18,126    
Interest and preferred dividends payable 3,973 4,206    
Taxes accrued 27,571 28,100    
Regulatory liabilities 1,029 2,219    
Other 8,173 7,637    
Total current liabilities 56,037 60,288    
Deferred credits and other liabilities        
Deferred income taxes 113,277 108,052    
Regulatory liabilities 100,973 93,974    
Unamortized tax credits 16,048 15,994    
Defined benefit pension and other postretirement benefit plans liability 72,366 75,005    
Other 14,383 13,024    
Total deferred credits and other liabilities 317,047 306,049    
Contributions in aid of construction 98,152 97,210    
Total liabilities and shareholders’ equity 986,213 975,541    
Maui Electric        
Utility property, plant and equipment        
Land 3,016 3,016    
Plant and equipment 1,130,942 1,109,487    
Less accumulated depreciation (493,707) (478,644)    
Construction in progress 28,935 19,038    
Utility property, plant and equipment, net 669,186 652,897    
Nonutility property, plant and equipment, less accumulated depreciation 1,532 1,532    
Total property, plant and equipment, net 670,718 654,429    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 1,718 2,048 6,047 5,385
Advances to affiliates 4,000 10,000    
Customer accounts receivable, net 19,344 17,260    
Accrued unbilled revenues, net 13,918 12,308    
Other accounts receivable, net 1,244 1,416    
Fuel oil stock, at average cost 11,759 10,962    
Materials and supplies, at average cost 18,134 16,371    
Prepayments and other 3,647 2,179    
Regulatory assets 4,824 2,364    
Total current assets 78,588 74,908    
Other long-term assets        
Regulatory assets 105,847 108,324    
Unamortized debt expense 106 34    
Other 14,823 13,592    
Total other long-term assets 120,776 121,950    
Total assets 870,082 851,287    
Capitalization        
Common stock equity 265,251 259,554 270,981 263,725
Cumulative preferred stock—not subject to mandatory redemption 5,000 5,000    
Long-term debt, net 189,868 190,120    
Total capitalization 460,119 454,674    
Current liabilities        
Short-term borrowings from non-affiliates 0      
Short-term borrowings from affiliate 0 0    
Accounts payable 14,331 13,319    
Interest and preferred dividends payable 3,429 2,882    
Taxes accrued 25,919 25,387    
Regulatory liabilities 1,794 1,543    
Other 13,111 12,501    
Total current liabilities 58,584 55,632    
Deferred credits and other liabilities        
Deferred income taxes 108,573 100,911    
Regulatory liabilities 33,314 31,845    
Unamortized tax credits 15,202 15,123    
Defined benefit pension and other postretirement benefit plans liability 78,156 80,263    
Other 16,068 14,969    
Total deferred credits and other liabilities 251,313 243,111    
Contributions in aid of construction 100,066 97,870    
Total liabilities and shareholders’ equity 870,082 851,287    
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 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    
Unamortized debt expense 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        
Short-term borrowings from non-affiliates 0      
Short-term borrowings from affiliate 0 0    
Accounts payable 0 0    
Interest and preferred dividends payable 0 0    
Taxes accrued 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    
Contributions in aid of construction 0 0    
Total liabilities and shareholders’ equity 101 101    
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 (559,671) (550,946)    
Current assets        
Cash and cash equivalents 0 0 0 0
Advances to affiliates (10,600) (13,500)    
Customer accounts receivable, net 0 0    
Accrued unbilled revenues, net 0 0    
Other accounts receivable, net (7,346) (6,280)    
Fuel oil stock, at average cost 0 0    
Materials and supplies, at average cost 0 0    
Prepayments and other (156) (933)    
Regulatory assets 0 0    
Total current assets (18,102) (20,713)    
Other long-term assets        
Regulatory assets 0 0    
Unamortized debt expense 0 0    
Other 0 0    
Total other long-term assets 0 0    
Total assets (577,773) (571,659)    
Capitalization        
Common stock equity (559,671) (550,946) (570,358) (556,528)
Cumulative preferred stock—not subject to mandatory redemption 0 0    
Long-term debt, net 0 0    
Total capitalization (559,671) (550,946)    
Current liabilities        
Short-term borrowings from non-affiliates 0      
Short-term borrowings from affiliate (10,600) (13,500)    
Accounts payable 0 0    
Interest and preferred dividends payable (11) (11)    
Taxes accrued (5,060) (933)    
Regulatory liabilities 0 0    
Other (7,335) (6,269)    
Total current liabilities (23,006) (20,713)    
Deferred credits and other liabilities        
Deferred income taxes 4,904 263    
Regulatory liabilities 0 0    
Unamortized tax credits 0 0    
Defined benefit pension and other postretirement benefit plans liability 0 0    
Other 0 (263)    
Total deferred credits and other liabilities 4,904 0    
Contributions in aid of construction 0 0    
Total liabilities and shareholders’ equity (577,773) (571,659)    
Hawaiian Electric Company, Inc. and Subsidiaries        
Utility property, plant and equipment        
Land 53,913 53,153    
Plant and equipment 6,778,254 6,605,732    
Less accumulated depreciation (2,460,429) (2,369,282)    
Construction in progress 307,492 211,742    
Utility property, plant and equipment, net 4,679,230 4,501,345    
Nonutility property, plant and equipment, less accumulated depreciation 7,409 7,407    
Total property, plant and equipment, net 4,686,639 4,508,752    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 9,987 74,286 22,977 24,449
Advances to affiliates 0 0    
Customer accounts receivable, net 133,135 123,688    
Accrued unbilled revenues, net 109,707 91,693    
Other accounts receivable, net 4,097 5,233    
Fuel oil stock, at average cost 60,253 66,430    
Materials and supplies, at average cost 55,959 53,679    
Prepayments and other 29,871 23,100    
Regulatory assets 72,773 66,032    
Total current assets 475,782 504,141    
Other long-term assets        
Regulatory assets 864,191 891,419    
Unamortized debt expense 661 208    
Other 80,228 70,908    
Total other long-term assets 945,080 962,535    
Total assets 6,107,501 5,975,428    
Capitalization        
Common stock equity 1,829,075 1,799,787 $ 1,766,727 $ 1,728,325
Cumulative preferred stock—not subject to mandatory redemption 34,293 34,293    
Long-term debt, net 1,318,623 1,319,260    
Total capitalization 3,181,991 3,153,340    
Current liabilities        
Short-term borrowings from non-affiliates 6,000 0    
Short-term borrowings from affiliate 0 0    
Accounts payable 124,240 117,814    
Interest and preferred dividends payable 25,261 22,838    
Taxes accrued 183,365 172,730    
Regulatory liabilities 3,399 3,762    
Other 59,611 55,221    
Total current liabilities 401,876 372,365    
Deferred credits and other liabilities        
Deferred income taxes 767,611 733,659    
Regulatory liabilities 462,817 406,931    
Unamortized tax credits 88,827 88,961    
Defined benefit pension and other postretirement benefit plans liability 581,713 599,726    
Other 57,548 76,921    
Total deferred credits and other liabilities 1,958,516 1,906,198    
Contributions in aid of construction 565,118 543,525    
Total liabilities and shareholders’ equity $ 6,107,501 $ 5,975,428