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Unconsolidated variable interest entities (Details) - HECO (USD $) In Millions, unless otherwise specified | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2004 item | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Power purchase agreement |  |  |  |
Number of power purchase agreements (PPAs) |  | 6 |  |
Maximum capacity of small power production facilities (in kilowatts) |  | 100 |  |
Power purchase capacity excluding agreements with smaller IPPs (in megawatts) |  | 548 |  |
HECO Capital Trust III |  |  |  |
Unconsolidated variable interest entities |  |  |  |
Investment in 2004 Debentures |  | $ 51.5 |  | $ 51.5
Interest income |  | 1.7 | 1.7 |
HECO Capital Trust III | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Unconsolidated variable interest entities |  |  |  |
Principal amount of 2004 Debentures | 31.5 |  |  |
HECO Capital Trust III | Hawaiian Electric Company, Inc. and Subsidiaries | 2004 Trust Preferred Securities |  |  |  |
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 | 50.0 |  |  |
Balance of Trust Securities |  | 50.0 |  | 50.0
Dividend distributions on Trust Preferred Securities |  | 1.6 | 1.6 |
HECO Capital Trust III | Hawaiian Electric Company, Inc. and Subsidiaries | Trust Common Securities |  |  |  |
Unconsolidated variable interest entities |  |  |  |
Aggregate Liquidation preference | 1.5 |  |  |
Balance of Trust Securities |  | 1.5 |  | 1.5
Common dividend |  | 0.1 | 0.1 |
HECO Capital Trust III | Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |
Unconsolidated variable interest entities |  |  |  |
Principal amount of 2004 Debentures | 10.0 |  |  |
HECO Capital Trust III | Maui Electric Company, Limited (MECO) |  |  |  |
Unconsolidated variable interest entities |  |  |  |
Principal amount of 2004 Debentures | $ 10.0 |  |  |

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- Definition Represents the entity's aggregate capacity utilized under power purchase agreements (PPAs) excluding power purchase agreements with smaller independent power producers and schedule Q providers. + References No definition available. + Details
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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 Adjustment to net income reflecting the dividends paid to the holders of Trust Common Securities. + References No definition available. + Details
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- Definition Maximum capacity of small power production facilities. + References No definition available. + Details
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- Definition Represents the number of firm power purchase agreements entered into, by the company. + References No definition available. + Details
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- 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 percentage rate used to calculate dividend payments on Trust Preferred Securities. + References No definition available. + Details
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- Definition Total number of Trust Preferred Securities issued during the period. + References No definition available. + Details
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- Definition The amount of interest incurred to a trust which has issued trust-preferred securities. In order to issue trust preferred securities, a sponsor forms a trust by investing a nominal amount of cash to purchase all of the voting common stock of the trust. The trust issues nonvoting, mandatorily redeemable preferred securities to outside investors in exchange for cash. The proceeds received from the issuance of the preferred securities, together with the cash received for issuing the common stock to the sponsor, is then loaned to the sponsor in exchange for a note which has the same terms as the trust preferred securities. Trust preferred securities possesses characteristics of both equity and debt issues and are generally issued by bank holding companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 55 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6924035&loc=d3e22274-110880 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 150 -Paragraph A4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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