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Electric utility segment - Consolidating balance sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Utility property, plant and equipment        
Total property, plant and equipment, net $ 4,532,556 $ 4,377,658    
Other long-term assets        
Total assets 12,198,985 11,782,018    
Capitalization        
Common stock equity 2,068,388 1,927,640 $ 1,921,001 $ 1,790,573
Cumulative preferred stock — not subject to mandatory redemption 0 0    
Current liabilities        
Interest and preferred dividends payable 27,115 26,042    
Deferred credits and other liabilities        
Deferred income taxes 721,470 680,877    
Contributions in aid of construction 525,491 506,087    
Total liabilities and shareholders’ equity 12,198,985 11,782,018    
Hawaiian Electric Company        
Utility property, plant and equipment        
Land 43,945 43,557    
Plant and equipment 4,148,099 4,026,079    
Less accumulated depreciation (1,362,474) (1,316,467)    
Construction in progress 197,715 147,979    
Utility property, plant and equipment, net 3,027,285 2,901,148    
Nonutility property, plant and equipment, less accumulated depreciation 5,761 5,659    
Total property, plant and equipment, net 3,033,046 2,906,807    
Investment in wholly owned subsidiaries, at equity 570,358 556,528    
Current assets        
Cash and cash equivalents 9,821 16,281 7,665 12,416
Advances to affiliates 0 0    
Customer accounts receivable, net 93,253 93,515    
Accrued unbilled revenues, net 69,753 60,080    
Other accounts receivable, net 11,469 16,421    
Fuel oil stock, at average cost 45,298 49,455    
Materials and supplies, at average cost 32,676 30,921    
Prepayments and other 28,073 25,505    
Regulatory assets 67,042 63,615    
Total current assets 357,385 355,793    
Other long-term assets        
Regulatory assets 594,723 608,957    
Unamortized debt expense 193 359    
Other 42,872 47,731    
Total other long-term assets 637,788 657,047    
Total assets 4,598,577 4,476,175    
Capitalization        
Common stock equity 1,766,727 1,728,325 1,717,064 1,682,144
Cumulative preferred stock — not subject to mandatory redemption 22,293 22,293    
Long-term debt, net 875,573 875,163    
Total capitalization 2,664,593 2,625,781    
Current liabilities        
Short-term borrowings from affiliate 55,000 23,000    
Accounts payable 79,341 84,631    
Interest and preferred dividends payable 17,863 15,747    
Taxes accrued 115,245 131,668    
Regulatory liabilities 0 0    
Other 46,326 41,083    
Total current liabilities 313,775 296,129    
Deferred credits and other liabilities        
Deferred income taxes 510,457 466,133    
Regulatory liabilities 274,070 254,033    
Unamortized tax credits 57,058 54,078    
Defined benefit pension and other postretirement benefit plans liability 396,468 409,021    
Other 50,068 51,273    
Total deferred credits and other liabilities 1,288,121 1,234,538    
Contributions in aid of construction 332,088 319,727    
Total liabilities and shareholders’ equity 4,598,577 4,476,175    
HELCO        
Utility property, plant and equipment        
Land 6,214 6,219    
Plant and equipment 1,234,234 1,212,195    
Less accumulated depreciation (503,109) (486,028)    
Construction in progress 18,503 11,455    
Utility property, plant and equipment, net 755,842 743,841    
Nonutility property, plant and equipment, less accumulated depreciation 82 82    
Total property, plant and equipment, net 755,924 743,923    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 7,008 2,682 2,399 612
Advances to affiliates 18,500 15,500    
Customer accounts receivable, net 21,646 20,508    
Accrued unbilled revenues, net 12,904 12,531    
Other accounts receivable, net 2,852 1,275    
Fuel oil stock, at average cost 6,885 8,310    
Materials and supplies, at average cost 8,424 6,865    
Prepayments and other 4,484 9,091    
Regulatory assets 4,582 4,501    
Total current assets 87,285 81,263    
Other long-term assets        
Regulatory assets 111,715 114,562    
Unamortized debt expense 33 74    
Other 12,786 14,693    
Total other long-term assets 124,534 129,329    
Total assets 967,743 954,515    
Capitalization        
Common stock equity 299,276 292,702 286,788 281,846
Cumulative preferred stock — not subject to mandatory redemption 7,000 7,000    
Long-term debt, net 213,673 213,580    
Total capitalization 519,949 513,282    
Current liabilities        
Short-term borrowings from affiliate 0 0    
Accounts payable 14,844 17,702    
Interest and preferred dividends payable 4,034 4,255    
Taxes accrued 27,669 30,342    
Regulatory liabilities 1,777 1,030    
Other 9,856 8,760    
Total current liabilities 58,180 62,089    
Deferred credits and other liabilities        
Deferred income taxes 105,574 100,681    
Regulatory liabilities 91,897 84,623    
Unamortized tax credits 15,774 15,406    
Defined benefit pension and other postretirement benefit plans liability 67,415 69,893    
Other 13,436 13,243    
Total deferred credits and other liabilities 294,096 283,846    
Contributions in aid of construction 95,518 95,298    
Total liabilities and shareholders’ equity 967,743 954,515    
Maui Electric        
Utility property, plant and equipment        
Land 3,016 3,016    
Plant and equipment 1,101,229 1,077,424    
Less accumulated depreciation (478,018) (463,509)    
Construction in progress 20,390 15,875    
Utility property, plant and equipment, net 646,617 632,806    
Nonutility property, plant and equipment, less accumulated depreciation 1,531 1,531    
Total property, plant and equipment, net 648,148 634,337    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 6,047 5,385 539 633
Advances to affiliates 15,500 7,500    
Customer accounts receivable, net 19,519 18,755    
Accrued unbilled revenues, net 12,510 11,898    
Other accounts receivable, net 2,316 1,674    
Fuel oil stock, at average cost 12,297 13,451    
Materials and supplies, at average cost 16,256 16,643    
Prepayments and other 3,548 2,295    
Regulatory assets 3,057 4,115    
Total current assets 91,050 81,716    
Other long-term assets        
Regulatory assets 98,656 100,981    
Unamortized debt expense 41 64    
Other 13,336 13,062    
Total other long-term assets 112,033 114,107    
Total assets 851,231 830,160    
Capitalization        
Common stock equity 270,981 263,725 262,018 256,692
Cumulative preferred stock — not subject to mandatory redemption 5,000 5,000    
Long-term debt, net 190,081 189,959    
Total capitalization 466,062 458,684    
Current liabilities        
Short-term borrowings from affiliate 0 0    
Accounts payable 13,312 12,513    
Interest and preferred dividends payable 4,048 3,113    
Taxes accrued 24,822 29,325    
Regulatory liabilities 1,210 1,174    
Other 12,568 13,194    
Total current liabilities 55,960 59,319    
Deferred credits and other liabilities        
Deferred income taxes 98,213 87,706    
Regulatory liabilities 31,525 30,683    
Unamortized tax credits 14,962 14,730    
Defined benefit pension and other postretirement benefit plans liability 72,029 74,060    
Other 14,595 13,916    
Total deferred credits and other liabilities 231,324 221,095    
Contributions in aid of construction 97,885 91,062    
Total liabilities and shareholders’ equity 851,231 830,160    
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 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 (570,358) (556,528)    
Current assets        
Cash and cash equivalents 0 0 0 0
Advances to affiliates (34,000) (23,000)    
Customer accounts receivable, net 0 0    
Accrued unbilled revenues, net 0 0    
Other accounts receivable, net (12,008) (8,962)    
Fuel oil stock, at average cost 0 0    
Materials and supplies, at average cost 0 0    
Prepayments and other (460) (251)    
Regulatory assets 0 0    
Total current assets (46,468) (32,213)    
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 (616,826) (588,741)    
Capitalization        
Common stock equity (570,358) (556,528) (548,907) (538,639)
Cumulative preferred stock — not subject to mandatory redemption 0 0    
Long-term debt, net 0 0    
Total capitalization (570,358) (556,528)    
Current liabilities        
Short-term borrowings from affiliate (34,000) (23,000)    
Accounts payable 0 0    
Interest and preferred dividends payable (11) (4)    
Taxes accrued (460) (251)    
Regulatory liabilities 0 0    
Other (11,997) (8,958)    
Total current liabilities (46,468) (32,213)    
Deferred credits and other liabilities        
Deferred income taxes 315 286    
Regulatory liabilities 0 0    
Unamortized tax credits 0 0    
Defined benefit pension and other postretirement benefit plans liability 0 0    
Other (315) (286)    
Total deferred credits and other liabilities 0 0    
Contributions in aid of construction 0 0    
Total liabilities and shareholders’ equity (616,826) (588,741)    
Hawaiian Electric Company, Inc. and Subsidiaries        
Utility property, plant and equipment        
Land 53,175 52,792    
Plant and equipment 6,483,562 6,315,698    
Less accumulated depreciation (2,343,601) (2,266,004)    
Construction in progress 236,608 175,309    
Utility property, plant and equipment, net 4,429,744 4,277,795    
Nonutility property, plant and equipment, less accumulated depreciation 7,374 7,272    
Total property, plant and equipment, net 4,437,118 4,285,067    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 22,977 24,449 10,704 13,762
Advances to affiliates 0 0    
Customer accounts receivable, net 134,418 132,778    
Accrued unbilled revenues, net 95,167 84,509    
Other accounts receivable, net 4,629 10,408    
Fuel oil stock, at average cost 64,480 71,216    
Materials and supplies, at average cost 57,356 54,429    
Prepayments and other 35,645 36,640    
Regulatory assets 74,681 72,231    
Total current assets 489,353 486,660    
Other long-term assets        
Regulatory assets 805,094 824,500    
Unamortized debt expense 267 497    
Other 68,994 75,486    
Total other long-term assets 874,355 900,483    
Total assets 5,800,826 5,672,210    
Capitalization        
Common stock equity 1,766,727 1,728,325 $ 1,717,064 $ 1,682,144
Cumulative preferred stock — not subject to mandatory redemption 34,293 34,293    
Long-term debt, net 1,279,327 1,278,702    
Total capitalization 3,080,347 3,041,320    
Current liabilities        
Short-term borrowings from affiliate 21,000 0    
Accounts payable 107,497 114,846    
Interest and preferred dividends payable 25,934 23,111    
Taxes accrued 167,276 191,084    
Regulatory liabilities 2,987 2,204    
Other 56,753 54,079    
Total current liabilities 381,447 385,324    
Deferred credits and other liabilities        
Deferred income taxes 714,559 654,806    
Regulatory liabilities 397,492 369,339    
Unamortized tax credits 87,794 84,214    
Defined benefit pension and other postretirement benefit plans liability 535,912 552,974    
Other 77,784 78,146    
Total deferred credits and other liabilities 1,813,541 1,739,479    
Contributions in aid of construction 525,491 506,087    
Total liabilities and shareholders’ equity $ 5,800,826 $ 5,672,210