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Electric utility segment - Consolidating balance sheet (Details 3) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Utility property, plant and equipment        
Total property, plant and equipment, net $ 4,317,121 $ 4,148,774    
Other long-term assets        
Total assets 11,573,466 11,185,142    
Capitalization        
Common stock equity 1,921,001 1,790,573 $ 1,800,457 $ 1,726,406
Cumulative preferred stock — not subject to mandatory redemption 0 0    
Current liabilities        
Interest and preferred dividends payable 25,914 25,336    
Deferred credits and other liabilities        
Deferred income taxes 643,951 633,570    
Contributions in aid of construction 495,667 466,432    
Total liabilities and shareholders’ equity 11,573,466 11,185,142    
Hawaiian Electric Company        
Utility property, plant and equipment        
Land 43,536 43,819    
Plant and equipment 3,941,406 3,782,438    
Less accumulated depreciation (1,293,046) (1,253,866)    
Construction in progress 166,027 134,376    
Utility property, plant and equipment, net 2,857,923 2,706,767    
Nonutility property, plant and equipment, less accumulated depreciation 4,948 4,950    
Total property, plant and equipment, net 2,862,871 2,711,717    
Investment in wholly owned subsidiaries, at equity 548,907 538,639    
Current assets        
Cash and cash equivalents 7,665 12,416 14,856 61,245
Advances to affiliates 12,000 16,100    
Customer accounts receivable, net 113,130 111,462    
Accrued unbilled revenues, net 96,789 103,072    
Other accounts receivable, net 12,538 9,980    
Fuel oil stock, at average cost 49,496 74,515    
Materials and supplies, at average cost 33,913 33,154    
Prepayments and other 34,555 44,680    
Regulatory assets 67,673 58,550    
Total current assets 427,759 463,929    
Other long-term assets        
Regulatory assets 612,347 623,784    
Unamortized debt expense 5,171 5,640    
Other 48,268 53,106    
Total other long-term assets 665,786 682,530    
Total assets 4,505,323 4,396,815    
Capitalization        
Common stock equity 1,717,064 1,682,144 1,635,751 1,593,564
Cumulative preferred stock — not subject to mandatory redemption 22,293 22,293    
Long-term debt, net 830,546 830,546    
Total capitalization 2,569,903 2,534,983    
Current liabilities        
Short-term borrowings from non-affiliates 94,995      
Short-term borrowings from affiliate 2,500 0    
Accounts payable 93,654 122,433    
Interest and preferred dividends payable 17,370 15,407    
Taxes accrued 134,076 176,339    
Regulatory liabilities 0 191    
Other 58,392 48,282    
Total current liabilities 400,987 362,652    
Deferred credits and other liabilities        
Deferred income taxes 444,261 429,515    
Regulatory liabilities 248,068 236,727    
Unamortized tax credits 53,491 49,865    
Defined benefit pension and other postretirement benefit plans liability 430,838 446,888    
Other 47,720 52,446    
Total deferred credits and other liabilities 1,224,378 1,215,441    
Contributions in aid of construction 310,055 283,739    
Total liabilities and shareholders’ equity 4,505,323 4,396,815    
HELCO        
Utility property, plant and equipment        
Land 5,731 5,464    
Plant and equipment 1,202,463 1,179,032    
Less accumulated depreciation (491,606) (473,933)    
Construction in progress 14,111 12,421    
Utility property, plant and equipment, net 730,699 722,984    
Nonutility property, plant and equipment, less accumulated depreciation 82 82    
Total property, plant and equipment, net 730,781 723,066    
Current assets        
Cash and cash equivalents 2,399 612 809 1,326
Advances to affiliates 0 0    
Customer accounts receivable, net 26,105 24,222    
Accrued unbilled revenues, net 12,230 15,926    
Other accounts receivable, net 1,168 981    
Fuel oil stock, at average cost 8,442 13,800    
Materials and supplies, at average cost 8,279 6,664    
Prepayments and other 3,957 8,611    
Regulatory assets 6,719 6,745    
Total current assets 69,299 77,561    
Other long-term assets        
Regulatory assets 106,581 107,454    
Unamortized debt expense 1,312 1,438    
Other 13,885 15,366    
Total other long-term assets 121,778 124,258    
Total assets 921,858 924,885    
Capitalization        
Common stock equity 286,788 281,846 279,388 274,802
Cumulative preferred stock — not subject to mandatory redemption 7,000 7,000    
Long-term debt, net 190,000 190,000    
Total capitalization 483,788 478,846    
Current liabilities        
Short-term borrowings from affiliate 12,000 10,500    
Accounts payable 16,128 23,728    
Interest and preferred dividends payable 3,553 3,989    
Taxes accrued 30,252 37,548    
Regulatory liabilities 0 0    
Other 11,063 9,866    
Total current liabilities 72,996 85,631    
Deferred credits and other liabilities        
Deferred income taxes 91,571 90,119    
Regulatory liabilities 83,194 77,707    
Unamortized tax credits 15,258 14,902    
Defined benefit pension and other postretirement benefit plans liability 66,632 72,547    
Other 13,647 10,658    
Total deferred credits and other liabilities 270,302 265,933    
Contributions in aid of construction 94,772 94,475    
Total liabilities and shareholders’ equity 921,858 924,885    
Maui Electric        
Utility property, plant and equipment        
Land 3,016 3,016    
Plant and equipment 1,072,245 1,048,012    
Less accumulated depreciation (461,962) (447,711)    
Construction in progress 16,543 11,819    
Utility property, plant and equipment, net 629,842 615,136    
Nonutility property, plant and equipment, less accumulated depreciation 1,532 1,531    
Total property, plant and equipment, net 631,374 616,667    
Current assets        
Cash and cash equivalents 539 633 2,621 153
Advances to affiliates 2,500      
Customer accounts receivable, net 23,233 22,800    
Accrued unbilled revenues, net 14,559 18,376    
Other accounts receivable, net 1,770 2,246    
Fuel oil stock, at average cost 12,166 17,731    
Materials and supplies, at average cost 16,781 17,432    
Prepayments and other 8,630 13,567    
Regulatory assets 5,558 6,126    
Total current assets 85,736 98,911    
Other long-term assets        
Regulatory assets 99,070 102,788    
Unamortized debt expense 1,103 1,245    
Other 13,798 13,366    
Total other long-term assets 113,971 117,399    
Total assets 831,081 832,977    
Capitalization        
Common stock equity 262,018 256,692 253,277 248,771
Cumulative preferred stock — not subject to mandatory redemption 5,000 5,000    
Long-term debt, net 186,000 186,000    
Total capitalization 453,018 447,692    
Current liabilities        
Short-term borrowings from affiliate 0 5,600    
Accounts payable 14,997 17,773    
Interest and preferred dividends payable 4,161 2,931    
Taxes accrued 29,498 36,807    
Regulatory liabilities 347 441    
Other 16,702 16,094    
Total current liabilities 65,705 79,646    
Deferred credits and other liabilities        
Deferred income taxes 89,276 83,238    
Regulatory liabilities 30,642 29,966    
Unamortized tax credits 14,899 14,725    
Defined benefit pension and other postretirement benefit plans liability 72,872 75,960    
Other 13,829 13,532    
Total deferred credits and other liabilities 221,518 217,421    
Contributions in aid of construction 90,840 88,218    
Total liabilities and shareholders’ equity 831,081 832,977    
Other subsidiaries        
Current assets        
Cash and cash equivalents 101 101 101 101
Total current assets 101 101    
Other long-term assets        
Total assets 101 101    
Capitalization        
Common stock equity 101 101 101 101
Total capitalization 101 101    
Deferred credits and other liabilities        
Total liabilities and shareholders’ equity 101 101    
Consolidating adjustments        
Utility property, plant and equipment        
Investment in wholly owned subsidiaries, at equity (548,907) (538,639)    
Current assets        
Cash and cash equivalents 0 0 0 0
Advances to affiliates (14,500) (16,100)    
Other accounts receivable, net (10,713) (8,924)    
Prepayments and other (251) (475)    
Total current assets (25,464) (25,499)    
Other long-term assets        
Regulatory assets 0 (183)    
Total other long-term assets 0 (183)    
Total assets (574,371) (564,321)    
Capitalization        
Common stock equity (548,907) (538,639) (532,766) (523,674)
Total capitalization (548,907) (538,639)    
Current liabilities        
Short-term borrowings from affiliate (14,500) (16,100)    
Interest and preferred dividends payable (6) (11)    
Taxes accrued (251) (292)    
Regulatory liabilities 0 0    
Other (10,707) (9,096)    
Total current liabilities (25,464) (25,499)    
Deferred credits and other liabilities        
Deferred income taxes 314      
Regulatory liabilities 0 (183)    
Defined benefit pension and other postretirement benefit plans liability (314)      
Total deferred credits and other liabilities 0 (183)    
Total liabilities and shareholders’ equity (574,371) (564,321)    
HECO Consolidated        
Utility property, plant and equipment        
Land 52,283 52,299    
Plant and equipment 6,216,114 6,009,482    
Less accumulated depreciation (2,246,614) (2,175,510)    
Construction in progress 196,681 158,616    
Utility property, plant and equipment, net 4,218,464 4,044,887    
Nonutility property, plant and equipment, less accumulated depreciation 6,562 6,563    
Total property, plant and equipment, net 4,225,026 4,051,450    
Current assets        
Cash and cash equivalents 10,704 13,762 18,387 62,825
Advances to affiliates 0      
Customer accounts receivable, net 162,468 158,484    
Accrued unbilled revenues, net 123,578 137,374    
Other accounts receivable, net 4,763 4,283    
Fuel oil stock, at average cost 70,104 106,046    
Materials and supplies, at average cost 58,973 57,250    
Prepayments and other 46,891 66,383    
Regulatory assets 79,950 71,421    
Total current assets 557,431 615,003    
Other long-term assets        
Regulatory assets 817,998 833,843    
Unamortized debt expense 7,586 8,323    
Other 75,951 81,838    
Total other long-term assets 901,535 924,004    
Total assets 5,683,992 5,590,457    
Capitalization        
Common stock equity 1,717,064 1,682,144 $ 1,635,751 $ 1,593,564
Cumulative preferred stock — not subject to mandatory redemption 34,293 34,293    
Long-term debt, net 1,206,546 1,206,546    
Total capitalization 2,957,903 2,922,983    
Current liabilities        
Short-term borrowings from non-affiliates 94,995 0    
Accounts payable 124,779 163,934    
Interest and preferred dividends payable 25,078 22,316    
Taxes accrued 193,575 250,402    
Regulatory liabilities 347 632    
Other 75,450 65,146    
Total current liabilities 514,224 502,430    
Deferred credits and other liabilities        
Deferred income taxes 625,422 602,872    
Regulatory liabilities 361,904 344,217    
Unamortized tax credits 83,648 79,492    
Defined benefit pension and other postretirement benefit plans liability 570,028 595,395    
Other 75,196 76,636    
Total deferred credits and other liabilities 1,716,198 1,698,612    
Contributions in aid of construction 495,667 466,432    
Total liabilities and shareholders’ equity $ 5,683,992 $ 5,590,457