Income Tax (tables)

9 Months Ended

Sep. 30, 2011

Income Tax Expense Benefit Abstract

Effective Tax Rate Reconciliation

		September 30,
		2011		2010
Federal statutory tax rate		35.0	%	35.0	%
Increase (decrease):
	Current state income tax, net of federal tax benefit	4.5	%	4.8	%
	Amortization of investment and energy tax credits	(0.4)	%	(0.4)	%
	Differences required to be flowed-through by regulatory commissions	1.5	%	1.2	%
	Gains on company and trust-owned life insurance	(0.9)	%	(0.8)	%
	Other - net	0.7	%	0.5	%
Effective income tax rate		40.4	%	40.3	%