Income Tax

3 Months Ended

Mar. 31, 2012

Disclosure Income Tax [Abstract]

Income Tax Text Block

9.        Income Tax

The effective income tax rate for the three months endedMarch 31, 2012 and 2011 varied from the combined federal and state statutory tax rates principally due to the following:

		March 31,
		2012		2011
Federal statutory tax rate		35.0	%	35.0	%
Increase (decrease):
	Current state income tax, net of federal tax benefit	4.6	%	4.6	%
	Amortization of investment and energy tax credits	(0.3)	%	(0.4)	%
	Differences required to be flowed-through by regulatory commissions	1.6	%	1.5	%
	Gains on company and trust-owned life insurance	(0.4)	%	(0.2)	%
	Other - net	0.2	%	0.1	%
Effective income tax rate		40.7	%	40.6	%

See Note 10 in our 2011 Form 10-K for more detail on income taxes and effective tax rates.