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Long-term debt (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Long-term debt | $ 1,340,070,000 | $ 1,364,942,000
Aggregate principal payments |  |
2012 | 65,000,000 |
2013 | 50,000,000 |
2014 | 111,000,000 |
2016 | 75,000,000 |
6.50% Junior Subordinated Deferrable Interest Debentures, Series 2004, due 2034 |  |
Long-term debt |  |
Debt instrument, stated interest rate (as a percent) | 6.50% |
Unsecured debt | 51,546,000 | 51,546,000
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Obligations to the State of Hawaii | 51,546,000 | 51,546,000
Special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Long-term debt |  |
Unsecured debt | 1,007,900,000 | 1,007,900,000
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Obligations to the State of Hawaii | 1,007,900,000 | 1,007,900,000
Less unamortized discount | (1,376,000) | (1,504,000)
Long-term debt | 1,006,524,000 | 1,006,396,000
4.75-4.95%, due 2012-2025 |  |
Long-term debt |  |
Debt instrument, stated interest rate, minimum (as a percent) | 4.75% |
Debt instrument, stated interest rate, maximum (as a percent) | 4.95% |
Unsecured debt | 118,500,000 | 118,500,000
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Obligations to the State of Hawaii | 118,500,000 | 118,500,000
5.00-5.50%, due 2014-2032 |  |
Long-term debt |  |
Debt instrument, stated interest rate, minimum (as a percent) | 5.00% |
Debt instrument, stated interest rate, maximum (as a percent) | 5.50% |
Unsecured debt | 203,400,000 | 203,400,000
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Obligations to the State of Hawaii | 203,400,000 | 203,400,000
5.65-5.75%, due 2018-2027 |  |
Long-term debt |  |
Debt instrument, stated interest rate, minimum (as a percent) | 5.65% |
Debt instrument, stated interest rate, maximum (as a percent) | 5.75% |
Unsecured debt | 216,000,000 | 216,000,000
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Obligations to the State of Hawaii | 216,000,000 | 216,000,000
6.15-6.20%, due 2020-2029 |  |
Long-term debt |  |
Debt instrument, stated interest rate, minimum (as a percent) | 6.15% |
Debt instrument, stated interest rate, maximum (as a percent) | 6.20% |
Unsecured debt | 55,000,000 | 55,000,000
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Obligations to the State of Hawaii | 55,000,000 | 55,000,000
4.60-4.65%, due 2026-2037 |  |
Long-term debt |  |
Debt instrument, stated interest rate, minimum (as a percent) | 4.60% |
Debt instrument, stated interest rate, maximum (as a percent) | 4.65% |
Unsecured debt | 265,000,000 | 265,000,000
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Obligations to the State of Hawaii | 265,000,000 | 265,000,000
6.50%, due 2039 |  |
Long-term debt |  |
Debt instrument, stated interest rate (as a percent) | 6.50% |
Unsecured debt | 150,000,000 | 150,000,000
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Obligations to the State of Hawaii | 150,000,000 | 150,000,000
HEI medium-term notes 4.23-6.141%, due 2011 |  |
Long-term debt |  |
Debt instrument, stated interest rate, minimum (as a percent) | 4.23% |
Debt instrument, stated interest rate, maximum (as a percent) | 6.141% |
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Long-term debt |  | 150,000,000
HEI medium-term note 7.13%, due 2012 |  |
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Long-term debt | 7,000,000 | 7,000,000
HEI medium-term note 5.25%, due 2013 |  |
Long-term debt |  |
Debt instrument, stated interest rate (as a percent) | 5.25% |
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Long-term debt | 50,000,000 | 50,000,000
HEI medium-term note 6.51%, due 2014 |  |
Long-term debt |  |
Debt instrument, stated interest rate (as a percent) | 6.51% |
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Long-term debt | 100,000,000 | 100,000,000
HEI senior note 4.41%, due 2016 |  |
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Long-term debt | 75,000,000 |
HEI senior note 5.67%, due 2021 |  |
Obligations to the State of Hawaii for the repayment of special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |
Long-term debt | $ 50,000,000 |

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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