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Income Tax

9 Months Ended

Sep. 30, 2013

8. INCOME TAX

The effective income tax rate varied from the combined federal and state statutory tax rates due to the following:



	Nine Months Ended September 30,
	2013		2012
Federal statutory tax rate	35.0	%	35.0	%
Increase (decrease):
Current state income tax, net of federal tax benefit	4.6		4.5
Amortization of investment and energy tax credits	(0.3	)	(0.3	)
Differences required to be flowed-through by regulatory commissions	2.2		1.4
Gains on company and trust-owned life insurance	(1.3	)	(1.2	)
One-time state tax adjustment, net of federal benefit	—		4.8
Other, net	0.6		0.9
Effective income tax rate	40.8	%	45.1	%

The decrease in the effective income tax rate for the nine months ended September 30, 2013 compared to the same period in 2012 was primarily due to a $2.7 million one-time tax charge taken in 2012 from an Oregon general rate case disallowance. See Note 9 in the 2012 Form 10-K for more detail on income taxes and effective tax rates.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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