Segments Of Business

3 Months Ended

Mar. 31, 2012

Segments Of Business

(12) SEGMENTS OF BUSINESS

Alliant Energy—Certain financial information relating to Alliant Energy's business segments is as follows. As of March 31, 2012, Alliant Energy's RMT business qualified as assets and liabilities held for sale. The operating results of RMT have been separately classified and reported as discontinued operations in Alliant Energy's Condensed Consolidated Statements of Income. As a result, Alliant Energy no longer reports "Non-regulated—RMT" segment information. Intersegment revenues were not material to Alliant Energy's operations.

	Utility									Non-Regulated, Parent and  Other			Alliant  Energy Consolidated
	Electric		Gas		Other			Total
	(in millions)
Three Months Ended March 31, 2012
Operating revenues	$	572.4	$	167.1	$	13.7		$	753.2	$	12.5		$	765.7
Operating income		59.1		27.7		1.7			88.5		7.1			95.6
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax									26.4		12.9			39.3
Loss from discontinued operations, net of tax									—		(4.4	)		(4.4	)
Net income attributable to Alliant Energy common shareowners									26.4		8.5			34.9
Three Months Ended March 31, 2011
Operating revenues		620.3		229.0		16.7			866.0		11.2			877.2
Operating income (loss)		89.3		35.9		(3.3	)		121.9		5.4			127.3
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax									65.3		6.7			72.0
Income from discontinued operations, net of tax									—		1.5			1.5
Net income attributable to Alliant Energy common shareowners									65.3		8.2			73.5

IPL—Certain financial information relating to IPL's business segments is as follows. Intersegment revenues were not material to IPL's operations.

	Electric		Gas		Other		Total
	(in millions)
Three Months Ended March 31, 2012
Operating revenues	$	293.1	$	92.8	$	12.8	$	398.7
Operating income		6.7		14.2		3.0		23.9
Earnings loss for common stock								(4.7	)
Three Months Ended March 31, 2011
Operating revenues		330.2		131.9		15.4		477.5
Operating income		27.9		15.8		3.4		47.1
Earnings available for common stock								21.7

WPL—Certain financial information relating to WPL's business segments is as follows. Intersegment revenues were not material to WPL's operations.

	Electric		Gas		Other			Total
	(in millions)
Three Months Ended March 31, 2012
Operating revenues	$	279.3	$	74.3	$	0.9		$	354.5
Operating income (loss)		52.4		13.5		(1.3	)		64.6
Earnings available for common stock									31.1
Three Months Ended March 31, 2011
Operating revenues		290.1		97.1		1.3			388.5
Operating income (loss)		61.4		20.1		(6.7	)		74.8
Earnings available for common stock									43.6

IPL [Member]

Segments Of Business

(12) SEGMENTS OF BUSINESS

Alliant Energy—Certain financial information relating to Alliant Energy's business segments is as follows. As of March 31, 2012, Alliant Energy's RMT business qualified as assets and liabilities held for sale. The operating results of RMT have been separately classified and reported as discontinued operations in Alliant Energy's Condensed Consolidated Statements of Income. As a result, Alliant Energy no longer reports "Non-regulated—RMT" segment information. Intersegment revenues were not material to Alliant Energy's operations.

	Utility									Non-Regulated, Parent and  Other			Alliant  Energy Consolidated
	Electric		Gas		Other			Total
	(in millions)
Three Months Ended March 31, 2012
Operating revenues	$	572.4	$	167.1	$	13.7		$	753.2	$	12.5		$	765.7
Operating income		59.1		27.7		1.7			88.5		7.1			95.6
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax									26.4		12.9			39.3
Loss from discontinued operations, net of tax									—		(4.4	)		(4.4	)
Net income attributable to Alliant Energy common shareowners									26.4		8.5			34.9
Three Months Ended March 31, 2011
Operating revenues		620.3		229.0		16.7			866.0		11.2			877.2
Operating income (loss)		89.3		35.9		(3.3	)		121.9		5.4			127.3
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax									65.3		6.7			72.0
Income from discontinued operations, net of tax									—		1.5			1.5
Net income attributable to Alliant Energy common shareowners									65.3		8.2			73.5

IPL—Certain financial information relating to IPL's business segments is as follows. Intersegment revenues were not material to IPL's operations.

	Electric		Gas		Other		Total
	(in millions)
Three Months Ended March 31, 2012
Operating revenues	$	293.1	$	92.8	$	12.8	$	398.7
Operating income		6.7		14.2		3.0		23.9
Earnings loss for common stock								(4.7	)
Three Months Ended March 31, 2011
Operating revenues		330.2		131.9		15.4		477.5
Operating income		27.9		15.8		3.4		47.1
Earnings available for common stock								21.7

WPL—Certain financial information relating to WPL's business segments is as follows. Intersegment revenues were not material to WPL's operations.

	Electric		Gas		Other			Total
	(in millions)
Three Months Ended March 31, 2012
Operating revenues	$	279.3	$	74.3	$	0.9		$	354.5
Operating income (loss)		52.4		13.5		(1.3	)		64.6
Earnings available for common stock									31.1
Three Months Ended March 31, 2011
Operating revenues		290.1		97.1		1.3			388.5
Operating income (loss)		61.4		20.1		(6.7	)		74.8
Earnings available for common stock									43.6

WPL [Member]

Segments Of Business

(12) SEGMENTS OF BUSINESS

Alliant Energy—Certain financial information relating to Alliant Energy's business segments is as follows. As of March 31, 2012, Alliant Energy's RMT business qualified as assets and liabilities held for sale. The operating results of RMT have been separately classified and reported as discontinued operations in Alliant Energy's Condensed Consolidated Statements of Income. As a result, Alliant Energy no longer reports "Non-regulated—RMT" segment information. Intersegment revenues were not material to Alliant Energy's operations.

	Utility									Non-Regulated, Parent and  Other			Alliant  Energy Consolidated
	Electric		Gas		Other			Total
	(in millions)
Three Months Ended March 31, 2012
Operating revenues	$	572.4	$	167.1	$	13.7		$	753.2	$	12.5		$	765.7
Operating income		59.1		27.7		1.7			88.5		7.1			95.6
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax									26.4		12.9			39.3
Loss from discontinued operations, net of tax									—		(4.4	)		(4.4	)
Net income attributable to Alliant Energy common shareowners									26.4		8.5			34.9
Three Months Ended March 31, 2011
Operating revenues		620.3		229.0		16.7			866.0		11.2			877.2
Operating income (loss)		89.3		35.9		(3.3	)		121.9		5.4			127.3
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax									65.3		6.7			72.0
Income from discontinued operations, net of tax									—		1.5			1.5
Net income attributable to Alliant Energy common shareowners									65.3		8.2			73.5

IPL—Certain financial information relating to IPL's business segments is as follows. Intersegment revenues were not material to IPL's operations.

	Electric		Gas		Other		Total
	(in millions)
Three Months Ended March 31, 2012
Operating revenues	$	293.1	$	92.8	$	12.8	$	398.7
Operating income		6.7		14.2		3.0		23.9
Earnings loss for common stock								(4.7	)
Three Months Ended March 31, 2011
Operating revenues		330.2		131.9		15.4		477.5
Operating income		27.9		15.8		3.4		47.1
Earnings available for common stock								21.7

WPL—Certain financial information relating to WPL's business segments is as follows. Intersegment revenues were not material to WPL's operations.

	Electric		Gas		Other			Total
	(in millions)
Three Months Ended March 31, 2012
Operating revenues	$	279.3	$	74.3	$	0.9		$	354.5
Operating income (loss)		52.4		13.5		(1.3	)		64.6
Earnings available for common stock									31.1
Three Months Ended March 31, 2011
Operating revenues		290.1		97.1		1.3			388.5
Operating income (loss)		61.4		20.1		(6.7	)		74.8
Earnings available for common stock									43.6