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Electric utility segment - Unconsolidated variable interest entities (Details) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Aug. 31, 2012 MW | Oct. 31, 2004 MW | Mar. 31, 2004 USD ($) security | Oct. 31, 1988 MW | Mar. 31, 1988 MW | Mar. 31, 2017 USD ($) agreement entity | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Power purchase agreement |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  |  | $ 127,000,000 | $ 116,000,000 |
Termination period (in days) |  |  |  |  |  | 60 days |  |
Minimum power volume required (in megawatts) | MW | 186 |  |  |  | 180 |  |  |
Accounts payable |  |  |  |  |  | $ 160,819,000 |  | $ 143,279,000
Hawaiian Electric Company |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |
Number of power purchase agreements (PPAs) (in agreements) | agreement |  |  |  |  |  | 5 |  |
Number of entities currently not required to be consolidated as VIEs (in entities) | entity |  |  |  |  |  | 0 |  |
Purchases from IPPs |  |  |  |  |  | $ 100,147,000 | 91,917,000 |
Number of firm capacity producers declining to provide financial information to determine primary beneficiary status (in entities) | entity |  |  |  |  |  | 2 |  |
Minimum potential number of IPP entities consolidated into company in the future (in entities) | entity |  |  |  |  |  | 1 |  |
Hawaiian Electric Company | Kalaeloa Partners, L.P. (Kalaeloa) |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  |  | $ 40,000,000 | 29,000,000 |
Power purchase capacity that Increases from initial capacity (in megawatts) | MW |  |  |  | 180 |  |  |  |
Number of years entity entered under power purchase agreement (in years) |  |  |  | 25 years |  |  |  |
Power purchase capacity that Increases from initial capacity (in megawatts) | MW |  | 208 |  |  |  |  |  |
Accounts payable |  |  |  |  |  | 11,000,000 |  |
Hawaiian Electric Company | AES Hawaii, Inc. (AES Hawaii) |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  |  | 29,000,000 | 38,000,000 |
Number of years entity entered under power purchase agreement (in years) |  |  |  |  | 30 years |  |  |
Accounts payable |  |  |  |  |  | 13,000,000 |  |
Hawaiian Electric Company | HPOWER |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  |  | 17,000,000 | 16,000,000 |
Hawaiian Electric Company | Puna Geothermal Venture |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  |  | 8,000,000 | 7,000,000 |
Hawaiian Electric Company | Hamakua Energy Partners, L.P. (HEP) |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  |  | 7,000,000 | 11,000,000 |
Hawaiian Electric Company | Other IPPs |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  |  | 26,000,000 | 15,000,000 |
Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  |  | 18,589,000 | 16,797,000 |
Maui Electric |  |  |  |  |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |
Purchases from IPPs |  |  |  |  |  | 8,388,000 | $ 7,145,000 |
HECO Capital Trust III |  |  |  |  |  |  |  |
Unconsolidated variable interest entities |  |  |  |  |  |  |  |
Investment in 2004 Debentures |  |  |  |  |  | 51,500,000 |  | 51,500,000
Interest income |  |  |  |  |  | $ 800,000 |  |
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 (as a percent) |  |  |  |  |  | 100.00% |  |
HECO Capital Trust III | Hawaiian Electric Company | 2004 Trust Preferred Securities |  |  |  |  |  |  |  |
Unconsolidated variable interest entities |  |  |  |  |  |  |  |
Number of 2004 Trust Preferred Securities issued (in securities) | 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
Dividend distributions on Trust Preferred Securities |  |  |  |  |  | 800,000 |  |
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
Common dividend |  |  |  |  |  | $ 25,000 |  |
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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- 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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