Business Segments (Tables)

3 Months Ended

Mar. 31, 2013

Business Segments [Abstract]

Business Segments [Table Text Block]

	Consolidated			Regulated Operations			Investments and Other
Millions
For the Quarter Ended March 31, 2013
Operating Revenue		$263.8			$241.4			$22.4
Fuel and Purchased Power Expense	86.5			86.5			—
Operating and Maintenance Expense	104.7			82.2			22.5
Depreciation Expense	28.2			26.8			1.4
Operating Income (Loss)	44.4			45.9			(1.5		)
Interest Expense	(12.3		)	(10.7		)	(1.6		)
Equity Earnings in ATC	5.2			5.2			—
Other Income	2.7			1.1			1.6
Income (Loss) Before Income Taxes	40.0			41.5			(1.5		)
Income Tax Expense (Benefit)	7.5			9.4			(1.9		)
Net Income		$32.5			$32.1			$0.4
As of March 31, 2013
Total Assets		$3,251.3			$2,967.9			$283.4
Property, Plant and Equipment – Net		$2,366.7			$2,300.8			$65.9
Accumulated Depreciation		$1,179.8			$1,121.8			$58.0
Capital Additions		$43.1			$42.6			$0.5

NOTE 2.  BUSINESS SEGMENTS (Continued)

	Consolidated			Regulated Operations			Investments and Other
Millions
For the Quarter Ended March 31, 2012
Operating Revenue		$240.0			$218.6			$21.4
Fuel and Purchased Power Expense	77.1			77.1			—
Operating and Maintenance Expense	99.9			78.1			21.8
Depreciation Expense	24.6			23.2			1.4
Operating Income (Loss)	38.4			40.2			(1.8		)
Interest Expense	(11.0		)	(9.6		)	(1.4		)
Equity Earnings in ATC	4.6			4.6			—
Other Income (Expense)	0.7			0.8			(0.1		)
Income (Loss) Before Income Taxes	32.7			36.0			(3.3		)
Income Tax Expense (Benefit)	8.3			11.6			(3.3		)
Net Income		$24.4			$24.4		—
As of March 31, 2012
Total Assets		$2,906.6			$2,586.4			$320.2
Property, Plant and Equipment – Net		$2,002.8			$1,945.6			$57.2
Accumulated Depreciation		$1,099.0			$1,045.9			$53.1
Capital Additions		$39.7			$38.7			$1.0