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Electric utility segment Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Regulatory assets |  |
Regulatory assets | $ 905,264 | $ 575,924
Regulatory liabilities |  |
Regulatory liabilities | 344,849 | 349,299
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Regulatory assets |  |
Regulatory assets | 905,264 | 575,924
Regulatory liabilities |  |
Regulatory liabilities | 344,849 | 349,299
Hawaiian Electric Company, Inc. and Subsidiaries | Cost of removal in excess of salvage value |  |
Regulatory liabilities |  |
Regulatory liabilities | 331,000 | 315,164
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans, regulatory liabilities |  |
Regulatory liabilities |  |
Regulatory liabilities | $ 12,413 | 31,546
Authorized amortization or recovery periods | 5 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory liabilities |  |
Regulatory liabilities |  |
Regulatory liabilities | $ 1,436 | 2,589
Authorized amortization or recovery periods | 5 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans, regulatory assets |  |
Regulatory assets |  |
Regulatory assets | $ 683,243 | 350,821
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes, net |  |
Regulatory assets |  |
Regulatory assets | 86,836 | 85,430
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account |  |
Regulatory assets |  |
Regulatory assets | 80,183 | 90,386
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances |  |
Regulatory assets |  |
Regulatory assets | 15,569 | 17,342
Hawaiian Electric Company, Inc. and Subsidiaries | Vacation earned, but not yet taken |  |
Regulatory assets |  |
Regulatory assets | $ 10,248 | 9,149
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Postretirement benefits other than pensions |  |
Regulatory assets |  |
Regulatory assets | $ 18 | 62
Authorized amortization or recovery periods | 18 years |
Remaining amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory assets |  |
Regulatory assets |  |
Regulatory assets | $ 29,167 | 22,734
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Cost of removal in excess of salvage value |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 60 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Other, regulatory liabilities |  |
Regulatory liabilities |  |
Remaining amortization or recovery periods | 2 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Income taxes, net |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 55 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Decoupling revenue balancing account |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 2 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Unamortized expense and premiums on retired debt and equity issuances |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 30 years |
Remaining amortization or recovery periods | 18 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Other, regulatory assets |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 50 years |
Remaining amortization or recovery periods | 46 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Cost of removal in excess of salvage value |  |
Regulatory liabilities |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Other, regulatory liabilities |  |
Regulatory liabilities |  |
Remaining amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Income taxes, net |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Decoupling revenue balancing account |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Unamortized expense and premiums on retired debt and equity issuances |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 19 years |
Remaining amortization or recovery periods | 6 years |
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Other, regulatory assets |  |
Regulatory assets |  |
Authorized amortization or recovery periods | 1 year |
Remaining amortization or recovery periods | 1 year |
Hawaiian Electric Company, Inc. and Subsidiaries | Current assets |  |
Regulatory assets |  |
Regulatory assets | $ 71,421 | 69,738
Hawaiian Electric Company, Inc. and Subsidiaries | Long-term assets |  |
Regulatory assets |  |
Regulatory assets | 833,843 | 506,186
Hawaiian Electric Company, Inc. and Subsidiaries | Current liabilities |  |
Regulatory liabilities |  |
Regulatory liabilities | 632 | 1,916
Hawaiian Electric Company, Inc. and Subsidiaries | Long-term liabilities |  |
Regulatory liabilities |  |
Regulatory liabilities | $ 344,217 | $ 347,383

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