Selected Consolidated Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Components Of Selected Consolidated Quarterly Financial Data

Alliant Energy - All “per share” references refer to earnings per diluted share. Summation of the individual quarters may not equal annual totals due to rounding. Refer to Note 17 for additional information on discontinued operations.

	2012										2011
	March 31			June 30		Sep. 30		Dec. 31			March 31		June 30		Sep. 30			Dec. 31
	(in millions, except per share data)
Operating revenues		$765.7			$690.3		$887.6		$750.9			$877.2		$712.5		$870.9			$760.8
Operating income	95.6			108.8		213.7		101.6			127.3		70.6		209.4			106.0
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax	39.3			65.5		149.0		71.1			72.0		50.3		136.9			63.9
Income (loss) from discontinued operations, net of tax	(4.4		)	0.4		1.7		(2.8		)	1.5		0.8		(14.9		)	(6.9		)
Net income	34.9			65.9		150.7		68.3			73.5		51.1		122.0			57.0
Earnings per weighted average common share attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax	0.36			0.60		1.34		0.64			0.65		0.45		1.23			0.58
Income (loss) from discontinued operations, net of tax	(0.04		)	—		0.02		(0.02		)	0.01		0.01		(0.13		)	(0.07		)
Net income	0.32			0.60		1.36		0.62			0.66		0.46		1.10			0.51

IPL [Member]

Components Of Selected Consolidated Quarterly Financial Data

IPL - Earnings per share data is not disclosed for IPL given Alliant Energy is the sole shareowner of all shares of IPL’s common stock outstanding during the periods presented.

	2012									2011
	March 31			June 30		Sep. 30		Dec. 31		March 31		June 30			Sep. 30		Dec. 31
	(in millions)
Operating revenues		$398.7			$360.7		$497.7		$393.2		$477.5		$374.1			$484.5		$404.0
Operating income	23.9			35.4		112.0		29.0		47.1		18.5			116.5		26.3
Net income (loss)	(1.5		)	19.6		106.5		25.6		27.1		1.0			101.4		9.8
Earnings available (loss) for common stock	(4.7		)	16.6		103.3		22.4		21.7		(2.3		)	98.3		6.6

WPL [Member]

Components Of Selected Consolidated Quarterly Financial Data

WPL - Earnings per share data is not disclosed for WPL given Alliant Energy is the sole shareowner of all shares of WPL’s common stock outstanding during the periods presented.

	2012								2011
	March 31		June 30		Sep. 30		Dec. 31		March 31		June 30		Sep. 30		Dec. 31
	(in millions)
Operating revenues		$354.5		$315.7		$376.6		$345.2		$388.5		$326.8		$374.6		$344.5
Operating income	64.6		61.5		93.4		65.3		74.8		45.5		86.9		73.2
Net income	31.9		36.1		56.7		41.0		44.4		25.0		51.4		42.7
Earnings available for common stock	31.1		35.2		55.9		40.2		43.6		24.1		50.6		41.9