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Electric utility segment - Condensed consolidating balance sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Utility property, plant and equipment        
Total property, plant and equipment, net $ 4,641,514 $ 4,603,465    
Current assets        
Cash and cash equivalents 234,230 278,452 $ 334,743 $ 300,478
Other long-term assets        
Total assets 12,543,275 12,425,506    
Capitalization        
Common stock equity 2,065,588 2,066,753 1,942,179 1,927,640
Cumulative preferred stock — not subject to mandatory redemption 0 0    
Current liabilities        
Interest and preferred dividends payable 27,407 25,225    
Deferred credits and other liabilities        
Deferred income taxes 740,506 728,806    
Contributions in aid of construction 541,574 543,525    
Total liabilities and shareholders’ equity 12,543,275 12,425,506    
Hawaiian Electric Company        
Utility property, plant and equipment        
Land 43,950 43,956    
Plant and equipment 4,272,395 4,241,060    
Less accumulated depreciation (1,404,024) (1,382,972)    
Construction in progress 196,535 180,194    
Utility property, plant and equipment, net 3,108,856 3,082,238    
Nonutility property, plant and equipment, less accumulated depreciation 5,763 5,760    
Total property, plant and equipment, net 3,114,619 3,087,998    
Investment in wholly owned subsidiaries, at equity 552,688 550,946    
Current assets        
Cash and cash equivalents 8,617 61,388 29,307 16,281
Advances to affiliates 0 0    
Customer accounts receivable, net 82,389 86,373    
Accrued unbilled revenues, net 70,398 65,821    
Other accounts receivable, net 24,489 7,652    
Fuel oil stock, at average cost 56,473 47,239    
Materials and supplies, at average cost 32,195 29,928    
Prepayments and other 21,150 16,502    
Regulatory assets 73,548 60,185    
Total current assets 369,259 375,088    
Other long-term assets        
Regulatory assets 637,014 662,232    
Unamortized debt expense 133 151    
Other 44,598 43,743    
Total other long-term assets 681,745 706,126    
Total assets 4,718,311 4,720,158    
Capitalization        
Common stock equity 1,799,769 1,799,787 1,731,304 1,728,325
Cumulative preferred stock — not subject to mandatory redemption 22,293 22,293    
Long-term debt, net 915,175 915,437    
Total capitalization 2,737,237 2,737,517    
Current liabilities        
Short-term borrowings from affiliates 1,500      
Short-term borrowings from affiliate 9,000 13,500    
Accounts payable 103,957 86,369    
Interest and preferred dividends payable 18,172 15,761    
Taxes accrued 90,035 120,176    
Regulatory liabilities 0 0    
Other 42,721 41,352    
Total current liabilities 265,385 277,158    
Deferred credits and other liabilities        
Deferred income taxes 532,497 524,433    
Regulatory liabilities 288,748 281,112    
Unamortized tax credits 58,691 57,844    
Defined benefit pension and other postretirement benefit plans liability 440,246 444,458    
Other 49,630 49,191    
Total deferred credits and other liabilities 1,369,812 1,357,038    
Contributions in aid of construction 345,877 348,445    
Total liabilities and shareholders’ equity 4,718,311 4,720,158    
HELCO        
Utility property, plant and equipment        
Land 6,191 6,181    
Plant and equipment 1,261,079 1,255,185    
Less accumulated depreciation (511,473) (507,666)    
Construction in progress 13,249 12,510    
Utility property, plant and equipment, net 769,046 766,210    
Nonutility property, plant and equipment, less accumulated depreciation 115 115    
Total property, plant and equipment, net 769,161 766,325    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 2,952 10,749 12,070 2,682
Advances to affiliates 6,500 3,500    
Customer accounts receivable, net 18,735 20,055    
Accrued unbilled revenues, net 13,883 13,564    
Other accounts receivable, net 2,526 2,445    
Fuel oil stock, at average cost 6,744 8,229    
Materials and supplies, at average cost 8,494 7,380    
Prepayments and other 4,621 5,352    
Regulatory assets 4,210 3,483    
Total current assets 68,665 74,757    
Other long-term assets        
Regulatory assets 119,783 120,863    
Unamortized debt expense 20 23    
Other 13,120 13,573    
Total other long-term assets 132,923 134,459    
Total assets 970,749 975,541    
Capitalization        
Common stock equity 292,001 291,291 293,358 292,702
Cumulative preferred stock — not subject to mandatory redemption 7,000 7,000    
Long-term debt, net 213,732 213,703    
Total capitalization 512,733 511,994    
Current liabilities        
Short-term borrowings from affiliates 0      
Short-term borrowings from affiliate 0 0    
Accounts payable 14,665 18,126    
Interest and preferred dividends payable 4,007 4,206    
Taxes accrued 21,965 28,100    
Regulatory liabilities 2,004 2,219    
Other 7,938 7,637    
Total current liabilities 50,579 60,288    
Deferred credits and other liabilities        
Deferred income taxes 109,733 108,052    
Regulatory liabilities 96,380 93,974    
Unamortized tax credits 16,941 15,994    
Defined benefit pension and other postretirement benefit plans liability 74,100 75,005    
Other 12,996 13,024    
Total deferred credits and other liabilities 310,150 306,049    
Contributions in aid of construction 97,287 97,210    
Total liabilities and shareholders’ equity 970,749 975,541    
Maui Electric        
Utility property, plant and equipment        
Land 3,016 3,016    
Plant and equipment 1,117,620 1,109,487    
Less accumulated depreciation (483,725) (478,644)    
Construction in progress 20,288 19,038    
Utility property, plant and equipment, net 657,199 652,897    
Nonutility property, plant and equipment, less accumulated depreciation 1,532 1,532    
Total property, plant and equipment, net 658,731 654,429    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 1,537 2,048 7,564 5,385
Advances to affiliates 2,500 10,000    
Customer accounts receivable, net 16,866 17,260    
Accrued unbilled revenues, net 13,351 12,308    
Other accounts receivable, net 1,125 1,416    
Fuel oil stock, at average cost 10,657 10,962    
Materials and supplies, at average cost 16,356 16,371    
Prepayments and other 3,163 2,179    
Regulatory assets 4,194 2,364    
Total current assets 69,749 74,908    
Other long-term assets        
Regulatory assets 106,660 108,324    
Unamortized debt expense 30 34    
Other 14,151 13,592    
Total other long-term assets 120,841 121,950    
Total assets 849,321 851,287    
Capitalization        
Common stock equity 260,586 259,554 264,426 263,725
Cumulative preferred stock — not subject to mandatory redemption 5,000 5,000    
Long-term debt, net 189,964 190,120    
Total capitalization 455,550 454,674    
Current liabilities        
Short-term borrowings from affiliates 0      
Short-term borrowings from affiliate 0 0    
Accounts payable 11,241 13,319    
Interest and preferred dividends payable 3,997 2,882    
Taxes accrued 19,330 25,387    
Regulatory liabilities 687 1,543    
Other 13,326 12,501    
Total current liabilities 48,581 55,632    
Deferred credits and other liabilities        
Deferred income taxes 103,572 100,911    
Regulatory liabilities 32,121 31,845    
Unamortized tax credits 15,380 15,123    
Defined benefit pension and other postretirement benefit plans liability 79,510 80,263    
Other 16,197 14,969    
Total deferred credits and other liabilities 246,780 243,111    
Contributions in aid of construction 98,410 97,870    
Total liabilities and shareholders’ equity 849,321 851,287    
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 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 (552,688) (550,946)    
Current assets        
Cash and cash equivalents 0 0 0 0
Advances to affiliates (9,000) (13,500)    
Customer accounts receivable, net 0 0    
Accrued unbilled revenues, net 0 0    
Other accounts receivable, net (7,752) (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 (16,752) (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 (569,440) (571,659)    
Capitalization        
Common stock equity (552,688) (550,946) (557,885) (556,528)
Cumulative preferred stock — not subject to mandatory redemption 0 0    
Long-term debt, net 0 0    
Total capitalization (552,688) (550,946)    
Current liabilities        
Short-term borrowings from affiliates 0      
Short-term borrowings from affiliate (9,000) (13,500)    
Accounts payable 0 0    
Interest and preferred dividends payable (2) (11)    
Taxes accrued 0 (933)    
Regulatory liabilities 0 0    
Other (7,750) (6,269)    
Total current liabilities (16,752) (20,713)    
Deferred credits and other liabilities        
Deferred income taxes 215 263    
Regulatory liabilities 0 0    
Unamortized tax credits 0 0    
Defined benefit pension and other postretirement benefit plans liability 0 0    
Other (215) (263)    
Total deferred credits and other liabilities 0 0    
Contributions in aid of construction 0 0    
Total liabilities and shareholders’ equity (569,440) (571,659)    
Hawaiian Electric Company, Inc. and Subsidiaries        
Utility property, plant and equipment        
Land 53,157 53,153    
Plant and equipment 6,651,094 6,605,732    
Less accumulated depreciation (2,399,222) (2,369,282)    
Construction in progress 230,072 211,742    
Utility property, plant and equipment, net 4,535,101 4,501,345    
Nonutility property, plant and equipment, less accumulated depreciation 7,410 7,407    
Total property, plant and equipment, net 4,542,511 4,508,752    
Investment in wholly owned subsidiaries, at equity 0 0    
Current assets        
Cash and cash equivalents 13,207 74,286 49,042 24,449
Advances to affiliates 0 0    
Customer accounts receivable, net 117,990 123,688    
Accrued unbilled revenues, net 97,632 91,693    
Other accounts receivable, net 20,388 5,233    
Fuel oil stock, at average cost 73,874 66,430    
Materials and supplies, at average cost 57,045 53,679    
Prepayments and other 28,934 23,100    
Regulatory assets 81,952 66,032    
Total current assets 491,022 504,141    
Other long-term assets        
Regulatory assets 863,457 891,419    
Unamortized debt expense 183 208    
Other 71,869 70,908    
Total other long-term assets 935,509 962,535    
Total assets 5,969,042 5,975,428    
Capitalization        
Common stock equity 1,799,769 1,799,787 $ 1,731,304 $ 1,728,325
Cumulative preferred stock — not subject to mandatory redemption 34,293 34,293    
Long-term debt, net 1,318,871 1,319,260    
Total capitalization 3,152,933 3,153,340    
Current liabilities        
Short-term borrowings from affiliates 1,500 0    
Short-term borrowings from affiliate 0 0    
Accounts payable 129,863 117,814    
Interest and preferred dividends payable 26,174 22,838    
Taxes accrued 131,330 172,730    
Regulatory liabilities 2,691 3,762    
Other 56,235 55,221    
Total current liabilities 347,793 372,365    
Deferred credits and other liabilities        
Deferred income taxes 746,017 733,659    
Regulatory liabilities 417,249 406,931    
Unamortized tax credits 91,012 88,961    
Defined benefit pension and other postretirement benefit plans liability 593,856 599,726    
Other 78,608 76,921    
Total deferred credits and other liabilities 1,926,742 1,906,198    
Contributions in aid of construction 541,574 543,525    
Total liabilities and shareholders’ equity $ 5,969,042 $ 5,975,428