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Cash flows (Details) - HECO (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Supplemental disclosures of cash flow information
Income taxes paid			$ (21,000,000)	$ 44,000,000
Supplemental disclosures of noncash activities
Allowance for equity funds used during construction	1,317,000	1,847,000	2,561,000	3,620,000
Hawaiian Electric Company, Inc. and Subsidiaries
Supplemental disclosures of cash flow information
Interest paid			29,000,000	28,000,000
Income taxes paid			(27,000,000)	37,000,000
Supplemental disclosures of noncash activities
Allowance for equity funds used during construction	1,317,000	1,847,000	2,561,000	3,620,000
Noncash capital expenditures			$ 10,000,000	$ 7,000,000

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The amount of cash paid for interest during the period.

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The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets.

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