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Basis of presentation (Details) - HECO (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Consolidated Balance Sheet |  |  |
Total assets | $ 9,904,827 | $ 9,594,477 |
Retained earnings | 233,218 | 198,397 | 178,667
Total capitalization and liabilities | 9,904,827 | 9,594,477 |
Consolidated Statement of Changes in Common Stock Equity |  |  |
Retained earnings | 233,218 | 198,397 | 178,667
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Consolidated Balance Sheet |  |  |
Prepayments and other | 64,006 | 36,667 |
Total current assets | 719,192 | 650,269 |
Total assets | 4,961,715 | 4,674,007 |
Retained earnings | 921,309 | 881,041 | 851,613
Common stock equity | 1,443,338 | 1,402,841 | 1,334,155
Total capitalization | 2,625,500 | 2,437,704 |
Taxes accrued | 235,302 | 230,076 |
Total current liabilities | 577,062 | 564,992 |
Total capitalization and liabilities | 4,961,715 | 4,674,007 |
Consolidated Statement of Changes in Common Stock Equity |  |  |
Retained earnings | 921,309 | 881,041 | 851,613
Common stock equity | 1,443,338 | 1,402,841 | 1,334,155
As previously filed |  |  |
Consolidated Balance Sheet |  |  |
Total assets |  | 9,592,731 |
Retained earnings |  | 201,640 | 181,910
Total capitalization and liabilities |  | 9,592,731 |
Consolidated Statement of Changes in Common Stock Equity |  |  |
Retained earnings |  | 201,640 | 181,910
As previously filed | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Consolidated Balance Sheet |  |  |
Prepayments and other |  | 34,602 |
Total current assets |  | 648,204 |
Total assets |  | 4,671,942 |
Retained earnings |  | 884,284 | 854,856
Common stock equity |  | 1,406,084 | 1,337,398
Total capitalization |  | 2,440,947 |
Taxes accrued |  | 224,768 |
Total current liabilities |  | 559,684 |
Total capitalization and liabilities |  | 4,671,942 |
Consolidated Statement of Changes in Common Stock Equity |  |  |
Retained earnings |  | 884,284 | 854,856
Common stock equity |  | 1,406,084 | 1,337,398
Difference |  |  |
Consolidated Balance Sheet |  |  |
Total assets |  | 1,746 |
Retained earnings |  | (3,243) | (3,243)
Total capitalization and liabilities |  | 1,746 |
Consolidated Statement of Changes in Common Stock Equity |  |  |
Retained earnings |  | (3,243) | (3,243)
Difference | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Consolidated Balance Sheet |  |  |
Prepayments and other |  | 2,065 |
Total current assets |  | 2,065 |
Total assets |  | 2,065 |
Retained earnings |  | (3,243) | (3,243)
Common stock equity |  | (3,243) | (3,243)
Total capitalization |  | (3,243) |
Taxes accrued |  | 5,308 |
Total current liabilities |  | 5,308 |
Total capitalization and liabilities |  | 2,065 |
Consolidated Statement of Changes in Common Stock Equity |  |  |
Retained earnings |  | (3,243) | (3,243)
Common stock equity |  | $ (3,243) | $ (3,243)

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