Selected Consolidated Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

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.

	2016												2015
	March 31			June 30			Sep. 30			Dec. 31			March 31		June 30			Sep. 30			Dec. 31
	(in millions, except per share data)
Operating revenues		$843.8			$754.6			$924.6			$797.0			$897.4		$717.2			$898.9			$740.1
Operating income	145.9			128.6			162.6			99.9			152.9		109.0			235.9			79.2
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax	97.6			84.4			128.8			63.0			96.6		68.9			180.0			35.2
Loss from discontinued operations, net of tax	(1.1		)	(0.5		)	(0.4		)	(0.3		)	—		(1.3		)	(0.1		)	(1.1		)
Net income	96.5			83.9			128.4			62.7			96.6		67.6			179.9			34.1
Earnings per weighted average common share attributable to Alliant Energy common shareowners (a):
Income from continuing operations, net of tax	0.43			0.37			0.57			0.28			0.43		0.31			0.79			0.16
Loss from discontinued operations, net of tax	—			—			—			—			—		(0.01		)	—			(0.01		)
Net income	0.43			0.37			0.57			0.28			0.43		0.30			0.79			0.15

(a) Amounts reflect the effects of a two-for-one common stock split distributed in May 2016. Refer to Note 7 for additional details.

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.

	2016								2015
	March 31		June 30		Sep. 30		Dec. 31		March 31		June 30		Sep. 30		Dec. 31
	(in millions)
Operating revenues		$458.7		$411.0		$516.2		$434.5		$489.0		$382.2		$504.6		$398.7
Operating income	62.0		48.0		125.9		34.9		65.5		33.8		117.0		25.6
Net income	48.2		34.4		116.7		26.5		50.1		19.0		119.1		8.0
Earnings available for common stock	45.6		31.9		114.1		24.0		47.5		16.5		116.5		5.5

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.

	2016								2015
	March 31		June 30		Sep. 30		Dec. 31		March 31		June 30		Sep. 30		Dec. 31
	(in millions)
Operating revenues		$375.6		$334.3		$397.0		$352.2		$397.1		$324.7		$382.6		$330.7
Operating income	78.8		75.0		115.0		58.2		80.8		68.3		110.3		49.3
Net income	47.0		43.7		69.6		32.5		45.1		39.7		68.4		24.4
Earnings available for common stock	46.5		43.2		69.0		31.7		44.9		39.2		68.0		24.2