Business Segments (Tables)

3 Months Ended

Mar. 31, 2012

Business Segments [Abstract]

Business Segments [Table Text Block]

	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 (Loss)	0.7			0.8			(0.1		)
Income (Loss) Before Non-Controlling Interest and Income Taxes	32.7			36.0			(3.3		)
Income Tax Expense (Benefit)	8.3			11.6			(3.3		)
Net Income	24.4			24.4			—
Less: Non-Controlling Interest in Subsidiaries	—			—			—
Net Income Attributable to ALLETE	$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

	Consolidated			Regulated Operations			Investments and Other
Millions
For the Quarter Ended March 31, 2011
Operating Revenue	$242.2			$223.0			$19.2
Fuel and Purchased Power Expense	79.0			79.0			—
Operating and Maintenance Expense	90.1			71.2			18.9
Depreciation Expense	22.3			21.2			1.1
Operating Income (Loss)	50.8			51.6			(0.8		)
Interest Expense	(10.7		)	(8.6		)	(2.1		)
Equity Earnings in ATC	4.4			4.4			—
Other Income	0.8			0.6			0.2
Income (Loss) Before Non-Controlling Interest and Income Taxes	45.3			48.0			(2.7		)
Income Tax Expense (Benefit)	8.2			9.6			(1.4		)
Net Income (Loss)	37.1			38.4			(1.3		)
Less: Non-Controlling Interest in Subsidiaries	(0.1		)	—			(0.1		)
Net Income (Loss) Attributable to ALLETE	$37.2			$38.4			$(1.2)
As of March 31, 2011
Total Assets		$2,613.4			$2,381.8			$231.6
Property, Plant and Equipment – Net		$1,841.3			$1,794.6			$46.7
Accumulated Depreciation		$1,043.4			$993.1			$50.3
Capital Additions		$35.9			$33.0			$2.9