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Electric utility segment - Unconsolidated variable interest entities (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2015 MW | Oct. 31, 2004 MW | Mar. 31, 2004 USD ($) security | Oct. 31, 1988 MW | Sep. 30, 2015 USD ($) entity | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) agreement entity kW | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Power purchase agreement |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  | $ 161,000,000 | $ 193,000,000 | $ 446,000,000 | $ 546,000,000 |
Termination period |  |  |  |  |  |  | 60 days |  |
Accounts payable |  |  |  |  | $ 152,896,000 |  | $ 152,896,000 |  | $ 186,425,000
Hawaiian Electric Company |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Number of power purchase agreements (PPAs) | agreement |  |  |  |  |  |  | 6 |  |
Maximum capacity of small power production facilities (in kilowatts) | kW |  |  |  |  |  |  | 100 |  |
Number of entities currently not required to be consolidated as VIEs | entity |  |  |  |  | 0 |  | 0 |  |
Purchases from IPPs |  |  |  |  | $ 119,302,000 | 142,121,000 | $ 329,922,000 | 406,895,000 |
Number of firm capacity producers declining to provide financial information to determine primary beneficiary status | entity |  |  |  |  |  |  | 2 |  |
Minimum potential number of IPP entities consolidated into company in the future | entity |  |  |  |  |  |  | 1 |  |
Hawaiian Electric Company | AES Hawaii, Inc. (AES Hawaii) |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  | 37,000,000 | 38,000,000 | $ 97,000,000 | 107,000,000 |
Hawaiian Electric Company | Kalaeloa Partners, L.P. (Kalaeloa) |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  | 51,000,000 | 73,000,000 | 143,000,000 | 214,000,000 |
Power purchase capacity that Increases from initial capacity (in megawatts) | MW |  |  |  | 180 |  |  |  |  |
Number of years entity entered under power purchase agreement |  |  |  | 25 years |  |  |  |  |
Power purchase capacity that Increases from initial capacity (in megawatts) | MW |  | 208 |  |  |  |  |  |  |
Accounts payable |  |  |  |  | 13,000,000 |  | 13,000,000 |  |
Hawaiian Electric Company | Hamakua Energy Partners, L.P. (HEP) |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  | 13,000,000 | 16,000,000 | 34,000,000 | 36,000,000 |
Hawaiian Electric Company | HPOWER |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  | 18,000,000 | 18,000,000 | 50,000,000 | 50,000,000 |
Hawaiian Electric Company | Puna Geothermal Venture |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  | 8,000,000 | 10,000,000 | 22,000,000 | 36,000,000 |
Hawaiian Electric Company | Hawaiian Commercial & Sugar (HC&S) |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  | 2,000,000 | 2,000,000 | 7,000,000 | 50,000,000 |
Hawaiian Electric Company | Other IPPs |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  | 32,000,000 | 36,000,000 | 93,000,000 | 53,000,000 |
Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  | 26,713,000 | 34,166,000 | 73,161,000 | 91,827,000 |
Maui Electric |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  | 14,503,000 | $ 16,595,000 | 42,726,000 | 47,399,000 |
Maui Electric | Subsequent Event |  |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |
Maximum scheduled energy during certain month (in megawatts) | MW | 4 |  |  |  |  |  |  |  |
Maximum potential emergency power | MW | 16 |  |  |  |  |  |  |  |
HECO Capital Trust III |  |  |  |  |  |  |  |  |
Unconsolidated variable interest entities |  |  |  |  |  |  |  |  |
Investment in 2004 Debentures |  |  |  |  | 51,500,000 |  | 51,500,000 |  | 51,500,000
Interest income |  |  |  |  |  |  | $ 2,500,000 | 2,500,000 |
HECO Capital Trust III | Hawaiian Electric Company |  |  |  |  |  |  |  |  |
Unconsolidated variable interest entities |  |  |  |  |  |  |  |  |
Principal amount of 2004 Debentures |  |  | $ 31,500,000 |  |  |  |  |  |
Percent of ownership in Trust III |  |  |  |  |  |  | 100.00% |  |
HECO Capital Trust III | Hawaiian Electric Company | 2004 Trust Preferred Securities |  |  |  |  |  |  |  |  |
Unconsolidated variable interest entities |  |  |  |  |  |  |  |  |
Number of 2004 Trust Preferred Securities issued | security |  |  | 2,000,000 |  |  |  |  |  |
Dividend rate on 2004 Trust Preferred Securities (as a percent) |  |  | 6.50% |  |  |  |  |  |
Aggregate Liquidation preference |  |  | $ 50,000,000 |  |  |  |  |  |
Balance of Trust Securities |  |  |  |  | 50,000,000 |  | $ 50,000,000 |  | 50,000,000
Dividend distributions on Trust Preferred Securities |  |  |  |  |  |  | 2,400,000 | 2,400,000 |
HECO Capital Trust III | Hawaiian Electric Company | Trust Common Securities |  |  |  |  |  |  |  |  |
Unconsolidated variable interest entities |  |  |  |  |  |  |  |  |
Aggregate Liquidation preference |  |  | 1,500,000 |  |  |  |  |  |
Balance of Trust Securities |  |  |  |  | $ 1,500,000 |  | 1,500,000 |  | $ 1,500,000
Common dividend |  |  |  |  |  |  | $ 75,000 | $ 75,000 |
HECO Capital Trust III | Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |  |  |  |  |  |
Unconsolidated variable interest entities |  |  |  |  |  |  |  |  |
Principal amount of 2004 Debentures |  |  | 10,000,000 |  |  |  |  |  |
HECO Capital Trust III | Maui Electric |  |  |  |  |  |  |  |  |
Unconsolidated variable interest entities |  |  |  |  |  |  |  |  |
Principal amount of 2004 Debentures |  |  | $ 10,000,000 |  |  |  |  |  |

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