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Electric utility segment - Consolidating Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Utility property, plant and equipment        
Total property, plant and equipment, net $ 5,025,916 $ 4,603,465    
Other long-term assets        
Total assets 13,099,828 12,425,506 $ 11,782,018  
Capitalization        
Common stock equity 2,097,386 2,066,753 1,927,640 $ 1,790,573
Cumulative preferred stock – not subject to mandatory redemption 0 0    
Current liabilities        
Interest and dividends payable 25,837 25,225    
Deferred credits and other liabilities        
Deferred income taxes 388,430 728,806    
Contributions in aid of construction 565,668 543,525    
Total capitalization and liabilities 13,099,828 12,425,506    
Hawaiian Electric Company, Inc (HECO)        
Utility property, plant and equipment        
Land 43,972 43,956    
Plant and equipment 4,492,568 4,241,060    
Less accumulated depreciation (1,451,612) (1,382,972)    
Construction in progress 245,995 180,194    
Utility property, plant and equipment, net 3,330,923 3,082,238    
Nonutility property, plant and equipment, less accumulated depreciation 5,933 5,760    
Total property, plant and equipment, net 3,336,856 3,087,998    
Investment in wholly-owned subsidiaries, at equity 557,013 550,946    
Current assets        
Cash and cash equivalents 2,059 61,388 16,281 12,416
Advances to affiliates 0 0    
Customer accounts receivable, net 86,987 86,373    
Accrued unbilled revenues, net 77,176 65,821    
Other accounts receivable, net 11,376 7,652    
Fuel oil stock, at average cost 64,972 47,239    
Materials and supplies, at average cost 28,325 29,928    
Prepayments and other 17,928 16,502    
Regulatory assets 76,203 60,185    
Total current assets 365,026 375,088    
Other long-term assets        
Regulatory assets 557,464 662,232    
Unamortized debt expense 436 151    
Other 59,721 43,743    
Total other long-term assets 617,621 706,126    
Total assets 4,876,516 4,720,158    
Capitalization        
Common stock equity 1,845,283 1,799,787 1,728,325 1,682,144
Cumulative preferred stock – not subject to mandatory redemption 22,293 22,293    
Long-term debt, net 924,979 915,437    
Total capitalization 2,792,555 2,737,517    
Current liabilities        
Current portion of long-term debt 29,978      
Short-term borrowings from non-affiliate 4,999      
Short-term borrowings-affiliate 12,000 13,500    
Accounts payable 121,328 86,369    
Interest and dividends payable 15,677 15,761    
Taxes accrued, including revenue taxes 133,839 120,176    
Regulatory liabilities 607 0    
Other 43,121 41,352    
Total current liabilities 361,549 277,158    
Deferred credits and other liabilities        
Deferred income taxes 281,223 524,433    
Regulatory liabilities 613,329 281,112    
Unamortized tax credits 59,039 57,844    
Defined benefit pension and other postretirement benefit plans liability 340,983 444,458    
Other 61,738 49,191    
Total deferred credits and other liabilities 1,356,312 1,357,038    
Contributions in aid of construction 366,100 348,445    
Total capitalization and liabilities 4,876,516 4,720,158    
Hawaii Electric Light Company, Inc. (HELCO)        
Utility property, plant and equipment        
Land 6,189 6,181    
Plant and equipment 1,299,920 1,255,185    
Less accumulated depreciation (528,024) (507,666)    
Construction in progress 11,922 12,510    
Utility property, plant and equipment, net 790,007 766,210    
Nonutility property, plant and equipment, less accumulated depreciation 115 115    
Total property, plant and equipment, net 790,122 766,325    
Investment in wholly-owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 4,025 10,749 2,682 612
Advances to affiliates 0 3,500    
Customer accounts receivable, net 22,510 20,055    
Accrued unbilled revenues, net 15,940 13,564    
Other accounts receivable, net 2,268 2,445    
Fuel oil stock, at average cost 8,698 8,229    
Materials and supplies, at average cost 8,041 7,380    
Prepayments and other 4,514 5,352    
Regulatory assets 5,038 3,483    
Total current assets 71,034 74,757    
Other long-term assets        
Regulatory assets 122,783 120,863    
Unamortized debt expense 77 23    
Other 16,234 13,573    
Total other long-term assets 139,094 134,459    
Total assets 1,000,250 975,541    
Capitalization        
Common stock equity 286,647 291,291 292,702 281,846
Cumulative preferred stock – not subject to mandatory redemption 7,000 7,000    
Long-term debt, net 202,701 213,703    
Total capitalization 496,348 511,994    
Current liabilities        
Current portion of long-term debt 10,992      
Short-term borrowings from non-affiliate 0      
Short-term borrowings-affiliate 0 0    
Accounts payable 17,855 18,126    
Interest and dividends payable 4,174 4,206    
Taxes accrued, including revenue taxes 34,950 28,100    
Regulatory liabilities 1,245 2,219    
Other 9,818 7,637    
Total current liabilities 79,034 60,288    
Deferred credits and other liabilities        
Deferred income taxes 56,955 108,052    
Regulatory liabilities 169,139 93,974    
Unamortized tax credits 16,167 15,994    
Defined benefit pension and other postretirement benefit plans liability 66,447 75,005    
Other 19,276 13,024    
Total deferred credits and other liabilities 327,984 306,049    
Contributions in aid of construction 96,884 97,210    
Total capitalization and liabilities 1,000,250 975,541    
Maui Electric Company, Limited (MECO)        
Utility property, plant and equipment        
Land 3,016 3,016    
Plant and equipment 1,154,075 1,109,487    
Less accumulated depreciation (496,716) (478,644)    
Construction in progress 25,322 19,038    
Utility property, plant and equipment, net 685,697 652,897    
Nonutility property, plant and equipment, less accumulated depreciation 1,532 1,532    
Total property, plant and equipment, net 687,229 654,429    
Investment in wholly-owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 6,332 2,048 5,385 633
Advances to affiliates 12,000 10,000    
Customer accounts receivable, net 18,392 17,260    
Accrued unbilled revenues, net 13,938 12,308    
Other accounts receivable, net 1,210 1,416    
Fuel oil stock, at average cost 13,203 10,962    
Materials and supplies, at average cost 18,031 16,371    
Prepayments and other 2,913 2,179    
Regulatory assets 7,149 2,364    
Total current assets 93,168 74,908    
Other long-term assets        
Regulatory assets 100,660 108,324    
Unamortized debt expense 98 34    
Other 14,963 13,592    
Total other long-term assets 115,721 121,950    
Total assets 896,118 851,287    
Capitalization        
Common stock equity 270,265 259,554 263,725 256,692
Cumulative preferred stock – not subject to mandatory redemption 5,000 5,000    
Long-term debt, net 190,836 190,120    
Total capitalization 466,101 454,674    
Current liabilities        
Current portion of long-term debt 8,993      
Short-term borrowings from non-affiliate 0      
Short-term borrowings-affiliate 0 0    
Accounts payable 20,427 13,319    
Interest and dividends payable 2,735 2,882    
Taxes accrued, including revenue taxes 30,312 25,387    
Regulatory liabilities 1,549 1,543    
Other 14,197 12,501    
Total current liabilities 78,213 55,632    
Deferred credits and other liabilities        
Deferred income taxes 55,863 100,911    
Regulatory liabilities 94,901 31,845    
Unamortized tax credits 15,163 15,123    
Defined benefit pension and other postretirement benefit plans liability 65,518 80,263    
Other 17,675 14,969    
Total deferred credits and other liabilities 249,120 243,111    
Contributions in aid of construction 102,684 97,870    
Total capitalization and liabilities 896,118 851,287    
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        
Current portion of long-term debt 0      
Short-term borrowings from non-affiliate 0      
Short-term borrowings-affiliate 0 0    
Accounts payable 0 0    
Interest and 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    
Contributions in aid of construction 0 0    
Total capitalization and liabilities 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 (557,013) (550,946)    
Current assets        
Cash and cash equivalents 0 0 0 0
Advances to affiliates (12,000) (13,500)    
Customer accounts receivable, net 0 0    
Accrued unbilled revenues, net 0 0    
Other accounts receivable, net (7,691) (6,280)    
Fuel oil stock, at average cost 0 0    
Materials and supplies, at average cost 0 0    
Prepayments and other 0 (933)    
Regulatory assets 0 0    
Total current assets (19,691) (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 (576,704) (571,659)    
Capitalization        
Common stock equity (557,013) (550,946) (556,528) (538,639)
Cumulative preferred stock – not subject to mandatory redemption 0 0    
Long-term debt, net 0 0    
Total capitalization (557,013) (550,946)    
Current liabilities        
Current portion of long-term debt 0      
Short-term borrowings from non-affiliate 0      
Short-term borrowings-affiliate (12,000) (13,500)    
Accounts payable 0 0    
Interest and dividends payable (11) (11)    
Taxes accrued, including revenue taxes 0 (933)    
Regulatory liabilities 0 0    
Other (7,680) (6,269)    
Total current liabilities (19,691) (20,713)    
Deferred credits and other liabilities        
Deferred income taxes 0 263    
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 0 0    
Contributions in aid of construction 0 0    
Total capitalization and liabilities (576,704) (571,659)    
HECO Consolidated        
Utility property, plant and equipment        
Land 53,177 53,153    
Plant and equipment 6,946,563 6,605,732    
Less accumulated depreciation (2,476,352) (2,369,282)    
Construction in progress 283,239 211,742    
Utility property, plant and equipment, net 4,806,627 4,501,345    
Nonutility property, plant and equipment, less accumulated depreciation 7,580 7,407    
Total property, plant and equipment, net 4,814,207 4,508,752    
Investment in wholly-owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 12,517 74,286 24,449 13,762
Advances to affiliates 0 0    
Customer accounts receivable, net 127,889 123,688    
Accrued unbilled revenues, net 107,054 91,693    
Other accounts receivable, net 7,163 5,233    
Fuel oil stock, at average cost 86,873 66,430    
Materials and supplies, at average cost 54,397 53,679    
Prepayments and other 25,355 23,100    
Regulatory assets 88,390 66,032    
Total current assets 509,638 504,141    
Other long-term assets        
Regulatory assets 780,907 891,419    
Unamortized debt expense 611 208    
Other 90,918 70,908    
Total other long-term assets 872,436 962,535    
Total assets 6,196,281 5,975,428    
Capitalization        
Common stock equity 1,845,283 1,799,787 $ 1,728,325 $ 1,682,144
Cumulative preferred stock – not subject to mandatory redemption 34,293 34,293    
Long-term debt, net 1,318,516 1,319,260    
Total capitalization 3,198,092 3,153,340    
Current liabilities        
Current portion of long-term debt 49,963 0    
Short-term borrowings from non-affiliate 4,999 0    
Short-term borrowings-affiliate 0 0    
Accounts payable 159,610 117,814    
Interest and dividends payable 22,575 22,838    
Taxes accrued, including revenue taxes 199,101 172,730    
Regulatory liabilities 3,401 3,762    
Other 59,456 55,221    
Total current liabilities 499,105 372,365    
Deferred credits and other liabilities        
Deferred income taxes 394,041 733,659    
Regulatory liabilities 877,369 406,931    
Unamortized tax credits 90,369 88,961    
Defined benefit pension and other postretirement benefit plans liability 472,948 599,726    
Other 98,689 76,921    
Total deferred credits and other liabilities 1,933,416 1,906,198    
Contributions in aid of construction 565,668 543,525    
Total capitalization and liabilities $ 6,196,281 $ 5,975,428