Investment in ATC (Tables)

9 Months Ended

Sep. 30, 2013

Investment in ATC [Abstract]

ALLETE's Investment in ATC [Table Text Block]

ALLETE’s Investment in ATC
Millions
Equity Investment Balance as of December 31, 2012		$107.3
Cash Investments	2.3
Equity in ATC Earnings	15.1
Distributed ATC Earnings	(12.0		)
Equity Investment Balance as of September 30, 2013		$112.7

ATC Summarized Financial Data [Table Text Block]

ATC’s summarized financial data for the quarters and nine months ended September 30, 2013 and 2012, is as follows:

	Quarter Ended			Nine Months Ended
ATC Summarized Financial Data	September 30,			September 30,
Income Statement Data	2013		2012	2013		2012
Millions
Revenue		$160.5	$150.3		$464.3		$450.1
Operating Expense	77.6		68.8	217.2		210.1
Other Expense	20.2		21.0	62.6		62.1
Net Income		$62.7	$60.5		$184.5		$177.9
ALLETE’s Equity in Net Income		$4.9	$4.9		$15.1		$14.3