Business Segments (Tables)

9 Months Ended

Sep. 30, 2012

Business Segments [Abstract]

Business Segments [Table Text Block]

	Consolidated			Regulated Operations			Investments and Other
Millions
For the Quarter Ended September 30, 2012
Operating Revenue		$248.8			$226.4			$22.4
Fuel and Purchased Power Expense	79.5			79.5			—
Operating and Maintenance Expense	98.7			76.4			22.3
Depreciation Expense	25.0			23.5			1.5
Operating Income (Loss)	45.6			47.0			(1.4		)
Interest Expense	(12.3		)	(10.2		)	(2.1		)
Equity Earnings in ATC	4.9			4.9			—
Other Income	1.5			1.5			—
Income (Loss) Before Non-Controlling Interest and Income Taxes	39.7			43.2			(3.5		)
Income Tax Expense (Benefit)	10.3			13.9			(3.6		)
Net Income	29.4			29.3			0.1
Less: Non-Controlling Interest in Subsidiaries	—			—			—
Net Income Attributable to ALLETE		$29.4			$29.3			$0.1

	Consolidated			Regulated Operations			Investments and Other
Millions
For the Quarter Ended September 30, 2011
Operating Revenue		$226.9			$207.4			$19.5
Fuel and Purchased Power Expense	74.8			74.8			—
Operating and Maintenance Expense	90.5			70.4			20.1
Depreciation Expense	22.7			21.4			1.3
Operating Income (Loss)	38.9			40.8			(1.9		)
Interest Expense	(10.9		)	(9.2		)	(1.7		)
Equity Earnings in ATC	4.7			4.7			—
Other Income (Expense)	0.5			0.6			(0.1		)
Income (Loss) Before Non-Controlling Interest and Income Taxes	33.2			36.9			(3.7		)
Income Tax Expense (Benefit)	12.7			13.1			(0.4		)
Net Income (Loss)	20.5			23.8			(3.3		)
Less: Non-Controlling Interest in Subsidiaries	—			—			—
Net Income (Loss) Attributable to ALLETE		$20.5			$23.8		$(3.3)

	Consolidated			Regulated Operations			Investments and Other
Millions
For the Nine Months Ended September 30, 2012
Operating Revenue		$705.2			$642.0			$63.2
Fuel and Purchased Power Expense	228.7			228.7			—
Operating and Maintenance Expense	294.8			230.6			64.2
Depreciation Expense	74.4			70.1			4.3
Operating Income (Loss)	107.3			112.6			(5.3		)
Interest Expense	(33.4		)	(29.7		)	(3.7		)
Equity Earnings in ATC	14.3			14.3			—
Other Income (Expense)	3.4			3.5			(0.1		)
Income (Loss) Before Non-Controlling Interest and Income Taxes	91.6			100.7			(9.1		)
Income Tax Expense (Benefit)	23.4			32.6			(9.2		)
Net Income	68.2			68.1			0.1
Less: Non-Controlling Interest in Subsidiaries	—			—			—
Net Income Attributable to ALLETE		$68.2			$68.1			$0.1
As of September 30, 2012
Total Assets		$3,138.1			$2,830.9			$307.2
Property, Plant and Equipment – Net		$2,239.9			$2,180.8			$59.1
Accumulated Depreciation		$1,146.7			$1,091.5			$55.2
Capital Additions		$318.3			$312.6			$5.7

	Consolidated			Regulated Operations			Investments and Other
Millions
For the Nine Months Ended September 30, 2011
Operating Revenue		$689.0			$632.2			$56.8
Fuel and Purchased Power Expense	229.8			229.8			—
Operating and Maintenance Expense	276.3			218.8			57.5
Depreciation Expense	67.1			63.5			3.6
Operating Income (Loss)	115.8			120.1			(4.3		)
Interest Expense	(32.6		)	(26.9		)	(5.7		)
Equity Earnings in ATC	13.7			13.7			—
Other Income	2.3			1.8			0.5
Income (Loss) Before Non-Controlling Interest and Income Taxes	99.2			108.7			(9.5		)
Income Tax Expense (Benefit)	24.7			28.2			(3.5		)
Net Income (Loss)	74.5			80.5			(6.0		)
Less: Non-Controlling Interest in Subsidiaries	(0.2		)	—			(0.2		)
Net Income (Loss) Attributable to ALLETE		$74.7			$80.5		$(5.8)
As of September 30, 2011
Total Assets		$2,754.4			$2,436.0			$318.4
Property, Plant and Equipment – Net		$1,902.1			$1,847.1			$55.0
Accumulated Depreciation		$1,079.0			$1,028.6			$50.4
Capital Additions		$143.5			$128.4			$15.1