Investments (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Investments [Line Items]

Unconsolidated Equity Investments

Equity (income) loss from Alliant Energy’s and WPL’s unconsolidated investments accounted for under the equity method of accounting for the three months ended March 31 was as follows (in millions):

	Alliant Energy						WPL
	2013			2012			2013			2012
American Transmission Company LLC (ATC)		($10.3	)		($9.9	)		($10.3	)		($9.9	)
Other	(0.4		)	0.5			(0.5		)	(0.2		)
		($10.7	)		($9.4	)		($10.8	)		($10.1	)

Summary Financial Information

Summary financial information from the unaudited financial statements of ATC for the three months ended March 31 was as follows (in millions):

	2013	2012
Operating revenues	$151.7	$147.7
Operating income	82.0	78.1
Net income	60.5	58.1

WPL [Member]

Schedule of Investments [Line Items]

Unconsolidated Equity Investments

Equity (income) loss from Alliant Energy’s and WPL’s unconsolidated investments accounted for under the equity method of accounting for the three months ended March 31 was as follows (in millions):

	Alliant Energy						WPL
	2013			2012			2013			2012
American Transmission Company LLC (ATC)		($10.3	)		($9.9	)		($10.3	)		($9.9	)
Other	(0.4		)	0.5			(0.5		)	(0.2		)
		($10.7	)		($9.4	)		($10.8	)		($10.1	)

Summary Financial Information

Summary financial information from the unaudited financial statements of ATC for the three months ended March 31 was as follows (in millions):

	2013	2012
Operating revenues	$151.7	$147.7
Operating income	82.0	78.1
Net income	60.5	58.1