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Electric utility subsidiary - Consolidating balance sheet (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Utility plant, at cost        
Total property, plant and equipment, net $ 4,269,241 $ 4,148,774    
Other long-term assets        
Total assets 11,439,631 11,185,142    
Capitalization        
Common stock equity 1,898,520 1,790,573 $ 1,759,935 $ 1,726,406
Cumulative preferred stock — not subject to mandatory redemption 0 0    
Current liabilities        
Interest and preferred dividends payable 25,360 25,336    
Deferred credits and other liabilities        
Deferred income taxes 632,718 633,570    
Contributions in aid of construction 482,760 466,432    
Total liabilities and shareholders’ equity 11,439,631 11,185,142    
Hawaiian Electric Company        
Utility plant, at cost        
Land 43,542 43,819    
Plant and equipment 3,889,544 3,782,438    
Less accumulated depreciation (1,275,328) (1,253,866)    
Construction in progress 162,872 134,376    
Utility property, plant and equipment, net 2,820,630 2,706,767    
Nonutility property, plant and equipment, less accumulated depreciation 4,949 4,950    
Total property, plant and equipment, net 2,825,579 2,711,717    
Investment in wholly owned subsidiaries, at equity 543,351 538,639    
Current assets        
Cash and cash equivalents 3,393 12,416 8,106 61,245
Advances to affiliates 18,200 16,100    
Customer accounts receivable, net 95,975 111,462    
Accrued unbilled revenues, net 80,165 103,072    
Other accounts receivable, net 11,816 9,980    
Fuel oil stock, at average cost 85,710 74,515    
Materials and supplies, at average cost 32,857 33,154    
Prepayments and other 23,986 44,680    
Regulatory assets 82,751 58,550    
Total current assets 434,853 463,929    
Other long-term assets        
Regulatory assets 601,012 623,784    
Unamortized debt expense 5,397 5,640    
Other 52,211 53,106    
Total other long-term assets 658,620 682,530    
Total assets 4,462,403 4,396,815    
Capitalization        
Common stock equity 1,696,658 1,682,144 1,618,987 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 2,549,497 2,534,983    
Current liabilities        
Short-term borrowings from non-affiliates 88,993      
Short-term borrowings from affiliate 0 0    
Accounts payable 113,360 122,433    
Interest and preferred dividends payable 15,435 15,407    
Taxes accrued 130,919 176,339    
Regulatory liabilities 286 191    
Other 51,946 48,282    
Total current liabilities 400,939 362,652    
Deferred credits and other liabilities        
Deferred income taxes 428,866 429,515    
Regulatory liabilities 245,038 236,727    
Unamortized tax credits 53,632 49,865    
Defined benefit pension and other postretirement benefit plans liability 436,946 446,888    
Other 47,777 52,446    
Total deferred credits and other liabilities 1,212,259 1,215,441    
Contributions in aid of construction 299,708 283,739    
Total liabilities and shareholders’ equity 4,462,403 4,396,815    
HELCO        
Utility plant, at cost        
Land 5,464 5,464    
Plant and equipment 1,187,999 1,179,032    
Less accumulated depreciation (484,930) (473,933)    
Construction in progress 18,754 12,421    
Utility property, plant and equipment, net 727,287 722,984    
Nonutility property, plant and equipment, less accumulated depreciation 82 82    
Total property, plant and equipment, net 727,369 723,066    
Current assets        
Cash and cash equivalents 801 612 1,754 1,326
Advances to affiliates 0 0    
Customer accounts receivable, net 23,981 24,222    
Accrued unbilled revenues, net 13,772 15,926    
Other accounts receivable, net 2,009 981    
Fuel oil stock, at average cost 8,350 13,800    
Materials and supplies, at average cost 7,172 6,664    
Prepayments and other 3,345 8,611    
Regulatory assets 8,829 6,745    
Total current assets 68,259 77,561    
Other long-term assets        
Regulatory assets 105,093 107,454    
Unamortized debt expense 1,353 1,438    
Other 15,303 15,366    
Total other long-term assets 121,749 124,258    
Total assets 917,377 924,885    
Capitalization        
Common stock equity 285,104 281,846 278,995 274,802
Cumulative preferred stock — not subject to mandatory redemption 7,000 7,000    
Long-term debt, net 190,000 190,000    
Total capitalization 482,104 478,846    
Current liabilities        
Current portion of long-term debt 0      
Short-term borrowings from affiliate 13,000 10,500    
Accounts payable 16,479 23,728    
Interest and preferred dividends payable 3,962 3,989    
Taxes accrued 29,577 37,548    
Regulatory liabilities 0 0    
Other 9,237 9,866    
Total current liabilities 72,255 85,631    
Deferred credits and other liabilities        
Deferred income taxes 91,220 90,119    
Regulatory liabilities 81,195 77,707    
Unamortized tax credits 15,290 14,902    
Defined benefit pension and other postretirement benefit plans liability 67,802 72,547    
Other 13,142 10,658    
Total deferred credits and other liabilities 268,649 265,933    
Contributions in aid of construction 94,369 94,475    
Total liabilities and shareholders’ equity 917,377 924,885    
Maui Electric        
Utility plant, at cost        
Land 3,016 3,016    
Plant and equipment 1,064,686 1,048,012    
Less accumulated depreciation (458,445) (447,711)    
Construction in progress 14,729 11,819    
Utility property, plant and equipment, net 623,986 615,136    
Nonutility property, plant and equipment, less accumulated depreciation 1,531 1,531    
Total property, plant and equipment, net 625,517 616,667    
Current assets        
Cash and cash equivalents 175 633 2,759 153
Customer accounts receivable, net 19,966 22,800    
Accrued unbilled revenues, net 15,507 18,376    
Other accounts receivable, net 2,703 2,246    
Fuel oil stock, at average cost 14,348 17,731    
Materials and supplies, at average cost 17,326 17,432    
Prepayments and other 8,882 13,567    
Regulatory assets 7,656 6,126    
Total current assets 86,563 98,911    
Other long-term assets        
Regulatory assets 99,218 102,788    
Unamortized debt expense 1,150 1,245    
Other 14,418 13,366    
Total other long-term assets 114,786 117,399    
Total assets 826,866 832,977    
Capitalization        
Common stock equity 258,146 256,692 250,365 248,771
Cumulative preferred stock — not subject to mandatory redemption 5,000 5,000    
Long-term debt, net 186,000 186,000    
Total capitalization 449,146 447,692    
Current liabilities        
Short-term borrowings from affiliate 5,200 5,600    
Accounts payable 17,911 17,773    
Interest and preferred dividends payable 2,976 2,931    
Taxes accrued 28,408 36,807    
Regulatory liabilities 477 441    
Other 15,834 16,094    
Total current liabilities 70,806 79,646    
Deferred credits and other liabilities        
Deferred income taxes 85,616 83,238    
Regulatory liabilities 30,093 29,966    
Unamortized tax credits 14,971 14,725    
Defined benefit pension and other postretirement benefit plans liability 73,889 75,960    
Other 13,662 13,532    
Total deferred credits and other liabilities 218,231 217,421    
Contributions in aid of construction 88,683 88,218    
Total liabilities and shareholders’ equity 826,866 832,977    
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 plant, at cost        
Investment in wholly owned subsidiaries, at equity (543,351) (538,639)    
Current assets        
Cash and cash equivalents 0 0 0 0
Advances to affiliates (18,200) (16,100)    
Other accounts receivable, net (10,638) (8,924)    
Prepayments and other (251) (475)    
Total current assets (29,089) (25,499)    
Other long-term assets        
Regulatory assets 0 (183)    
Total other long-term assets 0 (183)    
Total assets (572,440) (564,321)    
Capitalization        
Common stock equity (543,351) (538,639) (529,461) (523,674)
Total capitalization (543,351) (538,639)    
Current liabilities        
Short-term borrowings from affiliate (18,200) (16,100)    
Interest and preferred dividends payable (6) (11)    
Taxes accrued (251) (292)    
Regulatory liabilities 0 0    
Other (10,632) (9,096)    
Total current liabilities (29,089) (25,499)    
Deferred credits and other liabilities        
Regulatory liabilities 0 (183)    
Total deferred credits and other liabilities 0 (183)    
Total liabilities and shareholders’ equity (572,440) (564,321)    
HECO Consolidated        
Utility plant, at cost        
Land 52,022 52,299    
Plant and equipment 6,142,229 6,009,482    
Less accumulated depreciation (2,218,703) (2,175,510)    
Construction in progress 196,355 158,616    
Utility property, plant and equipment, net 4,171,903 4,044,887    
Nonutility property, plant and equipment, less accumulated depreciation 6,562 6,563    
Total property, plant and equipment, net 4,178,465 4,051,450    
Current assets        
Cash and cash equivalents [1] 4,470 13,762 12,720 62,825
Customer accounts receivable, net 139,922 158,484    
Accrued unbilled revenues, net 109,444 137,374    
Other accounts receivable, net 5,890 4,283    
Fuel oil stock, at average cost 108,408 106,046    
Materials and supplies, at average cost 57,355 57,250    
Prepayments and other 35,962 66,383    
Regulatory assets 99,236 71,421    
Total current assets 560,687 615,003    
Other long-term assets        
Regulatory assets 805,323 833,843    
Unamortized debt expense 7,900 8,323    
Other 81,932 81,838    
Total other long-term assets 895,155 924,004    
Total assets 5,634,307 5,590,457    
Capitalization        
Common stock equity 1,696,658 1,682,144 $ 1,618,987 $ 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 2,937,497 2,922,983    
Current liabilities        
Current portion of long-term debt 0      
Short-term borrowings from non-affiliates 88,993 0    
Accounts payable 147,750 163,934    
Interest and preferred dividends payable 22,367 22,316    
Taxes accrued 188,653 250,402    
Regulatory liabilities 763 632    
Other 66,385 65,146    
Total current liabilities 514,911 502,430    
Deferred credits and other liabilities        
Deferred income taxes 605,702 602,872    
Regulatory liabilities 356,326 344,217    
Unamortized tax credits 83,893 79,492    
Defined benefit pension and other postretirement benefit plans liability 578,637 595,395    
Other 74,581 76,636    
Total deferred credits and other liabilities 1,699,139 1,698,612    
Contributions in aid of construction 482,760 466,432    
Total liabilities and shareholders’ equity $ 5,634,307 $ 5,590,457    
[1] As restated - See Note 1, “Basis of presentation - Restatement of previously issued financial statements.”