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Unconsolidated variable interest entities (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |
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Dec. 31, 2013 entity agreement | Dec. 31, 2012 | Dec. 31, 2013 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2012 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2011 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2013 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Dec. 31, 2012 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Dec. 31, 2011 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Dec. 31, 2013 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Dec. 31, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Dec. 31, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Dec. 31, 2013 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Dec. 31, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Dec. 31, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Dec. 31, 2013 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Dec. 31, 2012 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Dec. 31, 2011 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Dec. 31, 2013 Hawaiian Electric Company, Inc. and Subsidiaries Other Independent Power Producers [Member] | Dec. 31, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Other Independent Power Producers [Member] | Dec. 31, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Other Independent Power Producers [Member] | Dec. 31, 2013 HECO agreement entity kW | Dec. 31, 2012 HECO | Dec. 31, 2011 HECO | Dec. 31, 2013 HECO Kalaeloa Partners, L.P. (Kalaeloa) MW | Dec. 31, 2013 Hawaii Electric Light Company, Inc. (HELCO) | Dec. 31, 2012 Hawaii Electric Light Company, Inc. (HELCO) | Dec. 31, 2011 Hawaii Electric Light Company, Inc. (HELCO) | Dec. 31, 2013 Maui Electric Company, Limited (MECO) | Dec. 31, 2012 Maui Electric Company, Limited (MECO) | Dec. 31, 2011 Maui Electric Company, Limited (MECO) | Dec. 31, 2013 HECO Capital Trust III | Mar. 31, 2004 HECO Capital Trust III HECO | Mar. 31, 2004 HECO Capital Trust III HECO 2004 Trust Preferred Securities security | Dec. 31, 2013 HECO Capital Trust III HECO 2004 Trust Preferred Securities | Dec. 31, 2013 HECO Capital Trust III HECO Trust Common Securities | Mar. 31, 2004 HECO Capital Trust III HECO Trust Common Securities | Mar. 31, 2004 HECO Capital Trust III Hawaii Electric Light Company, Inc. (HELCO) | Mar. 31, 2004 HECO Capital Trust III Maui Electric Company, Limited (MECO)
Unconsolidated variable interest entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of 2004 Trust Preferred Securities issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |
Dividend rate on 2004 Trust Preferred Securities (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |  |  |
Aggregate Liquidation preference |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  | $ 1,500,000.0 |  |
Principal amount of 2004 Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,500,000.0 |  |  |  |  | 10,000,000 | 10,000,000
Investment in 2004 Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,500,000 |  |  |  |  |  |  |
Balance of Trust Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 | 1,500,000 |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,400,000 |  |  |  |  |  |  |
Dividend distributions on Trust Preferred Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,300,000 |  |  |  |
Common dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power purchase agreements (PPAs) | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum capacity of small power production facilities (in kilowatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of power purchase from AES Hawaii, Inc. (AES Hawaii), Kalaeloa Partners, L.P. (Kalaeloa), Hamakua Energy Partners, L.P. (HEP) and HPOWER |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  | 710,681,000 | 724,240,000 | 689,652,000 | 134,000,000 | 146,000,000 | 133,000,000 | 301,000,000 | 310,000,000 | 310,000,000 | 51,000,000 | 65,000,000 | 59,000,000 | 61,000,000 | 65,000,000 | 62,000,000 | 164,000,000 | 138,000,000 | 126,000,000 | 527,839,000 | 540,802,000 | 522,503,000 |  | 128,368,000 | 145,386,000 | 137,453,000 | 54,474,000 | 38,052,000 | 29,696,000 |  |  |  |  |  |  |  |
Number of largest IPP's declining to provide financial information to determine primary beneficiary status | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of entities owning wind farms not required to be consolidated as VIE's |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum potential number of IPP entities consolidated into company in the future |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power purchase capacity (in megawatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years entity entered under power purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Power purchase capacity that Increases from initial capacity (in megawatts) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | $ 212,331,000 | $ 212,379,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of purchased power charged against earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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