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Income Taxes
6 Months Ended
Jun. 30, 2011
Income Taxes [Abstract]  
Income Tax Disclosure [Text Block]
(8)
Income Taxes


The effective tax rate was 29% for the three-month period ended June 30, 2011 compared to 26% for 2010. The increase in PacifiCorp's effective tax rate for the three-month period ended June 30, 2011 was primarily due to the impact of lower allowance for equity funds in the current period, partially offset by the impact of production tax credits associated with PacifiCorp's wind-powered generating facilities.


The effective tax rate was 31% for the six-month period ended June 30, 2011 compared to 27% for 2010. The increase in PacifiCorp's effective tax rate for the six-month period ended June 30, 2011 was primarily due to the impact of lower allowance for equity funds in the current period and certain other effects of ratemaking in the first quarter of 2011, partially offset by the impact of production tax credits associated with PacifiCorp's wind-powered generating facilities.