Selected Consolidated Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Components Of Selected Consolidated Quarterly Financial Data

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 19 for additional information on discontinued operations.

	2015											2014
	March 31		June 30			Sep. 30			Dec. 31			March 31		June 30			Sep. 30			Dec. 31
	(in millions, except per share data)
Operating revenues		$897.4		$717.2			$898.9			$740.1			$952.8		$750.3			$843.1			$804.1
Operating income	152.9		109.0			235.9			79.2			154.2		103.3			194.8			91.3
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax	96.6		68.9			180.0			35.2			108.0		62.1			155.2			60.2
Loss from discontinued operations, net of tax	—		(1.3		)	(0.1		)	(1.1		)	—		(0.3		)	(1.9		)	(0.2		)
Net income	96.6		67.6			179.9			34.1			108.0		61.8			153.3			60.0
Earnings per weighted average common share attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax	0.87		0.61			1.59			0.31			0.97		0.56			1.40			0.54
Loss from discontinued operations, net of tax	—		(0.01		)	—			(0.01		)	—		—			(0.02		)	—
Net income	0.87		0.60			1.59			0.30			0.97		0.56			1.38			0.54

IPL [Member]

Components Of Selected Consolidated Quarterly Financial Data

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. Refer to Note 1(q) for discussion of IPL’s previously reported Selected Consolidated Quarterly Financial Data (Unaudited), which was impacted as a result of a change to IPL’s method of recording income taxes retrospectively adopted in the fourth quarter of 2015.

	2015								2014
	March 31		June 30		Sep. 30		Dec. 31		March 31		June 30		Sep. 30		Dec. 31
	(in millions)
Operating revenues		$489.0		$382.2		$504.6		$398.7		$528.9		$411.9		$476.2		$431.1
Operating income	65.5		33.8		117.0		25.6		57.5		34.0		93.9		23.8
Net income	50.1		19.0		119.1		8.0		45.3		20.5		104.6		21.4
Earnings available for common stock	47.5		16.5		116.5		5.5		42.7		18.0		102.0		18.9

WPL [Member]

Components Of Selected Consolidated Quarterly Financial Data

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. Refer to Note 1(q) for discussion of WPL’s previously reported Selected Consolidated Quarterly Financial Data (Unaudited), which was impacted as a result of a change to WPL’s method of recording income taxes retrospectively adopted in the fourth quarter of 2015.

	2015								2014
	March 31		June 30		Sep. 30		Dec. 31		March 31		June 30		Sep. 30		Dec. 31
	(in millions)
Operating revenues		$397.1		$324.7		$382.6		$330.7		$410.4		$324.5		$354.4		$359.8
Operating income	80.8		68.3		110.3		49.3		87.7		60.0		93.9		59.4
Net income	45.1		39.7		68.4		24.4		55.2		34.7		57.9		33.3
Earnings available for common stock	44.9		39.2		68.0		24.2		55.2		34.7		57.9		32.6