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Income taxes Deferred Tax Assets and Liabilities Due to Book/Tax Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Deferred tax assets |  |
Net operating loss | $ 0 | $ 0
Other | 58,352 | 57,239
Total deferred tax assets | 58,352 | 57,239
Deferred tax liabilities |  |
Property, plant and equipment | 448,723 | 378,280
Repairs deduction | 86,408 | 75,127
Regulatory assets, excluding amounts attributable to property, plant and equipment | 33,795 | 33,251
Deferred RAM and RBA revenues | 32,889 | 0
Retirement benefits | 25,336 | 29,280
Other | 62,935 | 70,561
Total deferred tax liabilities | 690,086 | 586,499
Deferred income taxes (credit) | 631,734 | 529,260
Total deferred tax liabilities | 631,734 | 529,260
Prepayments and other (Current assets-debit) |  |
Deferred tax liabilities |  |
Total deferred tax liabilities | 0 | 0
Other (Current liabilities-credit) |  |
Deferred tax liabilities |  |
Total deferred tax liabilities | 0 | 0
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Deferred tax assets |  |
Net operating loss | 51,936 | 19,848
Other | 17,663 | 17,295
Total deferred tax assets | 69,599 | 37,143
Deferred tax liabilities |  |
Property, plant and equipment | 446,259 | 375,771
Repairs deduction | 86,408 | 75,127
Regulatory assets, excluding amounts attributable to property, plant and equipment | 33,795 | 33,251
Deferred RAM and RBA revenues | 32,889 |
Retirement benefits | 28,758 | 23,851
Other | 14,929 | 15,602
Total deferred tax liabilities | 643,038 | 523,602
Deferred income taxes (credit) | 602,872 | 507,161
Total deferred tax liabilities | 573,439 | 486,459
Hawaiian Electric Company, Inc. and Subsidiaries | Prepayments and other (Current assets-debit) |  |
Deferred tax liabilities |  |
Total deferred tax liabilities | (32,915) | (20,702)
Hawaiian Electric Company, Inc. and Subsidiaries | Other (Current liabilities-credit) |  |
Deferred tax liabilities |  |
Total deferred tax liabilities | $ 3,482 | $ 0

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