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Commitments and contingencies (Tables) - HECO (Hawaiian Electric Company, Inc. and Subsidiaries) | 6 Months Ended
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Jun. 30, 2013
Hawaiian Electric Company, Inc. and Subsidiaries |
Regulatory projects and legal obligations |
Schedule of reductions from the interim D&O |
(in millions) |  |  |
Lower ROACE |  | $ | 4.0 |
Customer Information System expenses |  | 0.3 |
Pension and OPEB expense based on 3-year average |  | 1.5 |
Integrated resource planning expenses |  | 0.9 |
Operational and Renewable Energy Integration study costs |  | 1.1 |
Total adjustment |  | $ | 7.8 |
Schedule of changes in asset retirement obligation |
|  | Six months ended June 30 |
(in thousands) |  | 2013 |  | 2012 |
Balance, beginning of period |  | $ | 48,431 |  | $ | 50,871 |
Accretion expense |  | 363 |  | 862 |
Liabilities incurred |  | — |  | — |
Liabilities settled |  | (1,506 | ) | (2,217 | )
Revisions in estimated cash flows |  | (916 | ) | — |
Balance, end of period |  | $ | 46,372 |  | $ | 49,516 |

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- Definition Tabular disclosure of reductions from the interim decision and order. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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