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Unconsolidated variable interest entities (Details) - HECO (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 1 Months Ended | 9 Months Ended |  | 9 Months Ended |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries entity | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries item kW entity | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries Other IPPs | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Other IPPs | Sep. 30, 2013 Hawaiian Electric Company, Inc. and Subsidiaries Other IPPs | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Other IPPs | Sep. 30, 2013 Hawaii Electric Light Company, Inc. (HELCO) | Sep. 30, 2012 Hawaii Electric Light Company, Inc. (HELCO) | Sep. 30, 2013 Hawaii Electric Light Company, Inc. (HELCO) | Sep. 30, 2012 Hawaii Electric Light Company, Inc. (HELCO) | Sep. 30, 2013 Maui Electric Company, Limited (MECO) | Sep. 30, 2012 Maui Electric Company, Limited (MECO) | Sep. 30, 2013 Maui Electric Company, Limited (MECO) | Sep. 30, 2012 Maui Electric Company, Limited (MECO) | Sep. 30, 2013 HECO Capital Trust III | Sep. 30, 2012 HECO Capital Trust III | Dec. 31, 2012 HECO Capital Trust III | Mar. 31, 2004 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries | Mar. 31, 2004 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries 2004 Trust Preferred Securities item | Sep. 30, 2013 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries 2004 Trust Preferred Securities | Sep. 30, 2012 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries 2004 Trust Preferred Securities | Dec. 31, 2012 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries 2004 Trust Preferred Securities | Sep. 30, 2013 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries Trust Common Securities | Sep. 30, 2012 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries Trust Common Securities | Dec. 31, 2012 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries Trust Common Securities | Mar. 31, 2004 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries Trust Common Securities | Mar. 31, 2004 HECO Capital Trust III Hawaii Electric Light Company, Inc. (HELCO)
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 |
Principal amount of 2004 Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,500,000 |  |  |  |  |  |  |  |  | 10,000,000
Investment in 2004 Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,500,000 |  | 51,500,000 |  |  |  |  |  |  |  |  |  |
Balance of Trust Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  | 50,000,000 | 1,500,000 |  | 1,500,000 |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 | 2,500,000 |  |  |  |  |  |  |  |  |  |  |
Dividend distributions on Trust Preferred Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 | 2,400,000 |  |  |  |  |  |
Common dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power purchase agreements (PPAs) |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum capacity of small power production facilities (in kilowatts) |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of entities currently not required to be consolidated as VIEs |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of power purchase from AES Hawaii, Inc. (AES Hawaii), Kalaeloa Partners, L.P. (Kalaeloa), Hamakua Energy Partners, L.P. (HEP) and HPOWER |  |  |  |  |  |  |  | 91.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases from IPPs | 195,000,000 | 187,000,000 | 527,000,000 | 540,000,000 |  | 143,280,000 | 135,507,000 | 389,706,000 | 401,423,000 | 38,000,000 | 38,000,000 | 98,000,000 | 109,000,000 | 80,000,000 | 78,000,000 | 223,000,000 | 230,000,000 | 15,000,000 | 19,000,000 | 36,000,000 | 48,000,000 | 17,000,000 | 18,000,000 | 44,000,000 | 48,000,000 | 45,000,000 | 34,000,000 | 126,000,000 | 105,000,000 | 34,480,000 | 37,693,000 | 93,880,000 | 108,996,000 | 17,101,000 | 13,499,000 | 43,083,000 | 29,421,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of firm capacity producers declining to provide financial information to determine primary beneficiary status |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum potential number of IPP entities consolidated into company in the future |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | $ 206,803,000 |  | $ 206,803,000 |  | $ 212,379,000 |  |  |  |  |  |  |  |  | $ 24,000,000 |  | $ 24,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Preferred securities that embody an unconditional obligation requiring the issuer to redeem the securities by transferring the assets at a specified or determinable date (or dates) or upon an event that is certain to occur, that are issued by a trust to outside investors where the trust uses the proceeds of the issuance of those securities to purchase an equivalent amount of junior subordinated debentures or other loans having stated maturities. + References No definition available. + Details
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- Definition The value of liquidation preference (or restrictions) of securities that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References No definition available. + Details
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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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