Selected Consolidated Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

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.

	2017								2016
	March 31		June 30		Sep. 30		Dec. 31		March 31			June 30			Sep. 30			Dec. 31
	(in millions, except per share data)
Operating revenues		$853.9		$765.3		$906.9		$856.1		$843.8			$754.6			$924.6			$797.0
Operating income	142.9		149.3		231.5		129.7		145.9			128.6			162.6			99.9
Amounts attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax	99.0		94.3		168.8		93.8		97.6			84.4			128.8			63.0
Income (loss) from discontinued operations, net of tax	1.4		—		—		—		(1.1		)	(0.5		)	(0.4		)	(0.3		)
Net income	100.4		94.3		168.8		93.8		96.5			83.9			128.4			62.7
Earnings per weighted average common share attributable to Alliant Energy common shareowners:
Income from continuing operations, net of tax	0.43		0.41		0.73		0.41		0.43			0.37			0.57			0.28
Income from discontinued operations, net of tax	0.01		—		—		—		—			—			—			—
Net income	0.44		0.41		0.73		0.41		0.43			0.37			0.57			0.28

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.

	2017								2016
	March 31		June 30		Sep. 30		Dec. 31		March 31		June 30		Sep. 30		Dec. 31
	(in millions)
Operating revenues		$450.5		$420.2		$527.4		$472.2		$458.7		$411.0		$516.2		$434.5
Operating income	49.6		66.3		131.8		49.2		62.0		48.0		125.9		34.9
Net income	39.8		45.3		123.0		18.9		48.2		34.4		116.7		26.5
Earnings available for common stock	37.2		42.8		120.4		16.4		45.6		31.9		114.1		24.0

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.

	2017								2016
	March 31		June 30		Sep. 30		Dec. 31		March 31		June 30		Sep. 30		Dec. 31
	(in millions)
Operating revenues		$393.1		$334.8		$370.2		$374.7		$375.6		$334.3		$397.0		$352.2
Operating income	86.0		73.7		90.7		72.8		78.8		75.0		115.0		58.2
Net income	45.5		38.1		49.8		53.2		47.0		43.7		69.6		32.5
Earnings available for common stock	45.5		38.1		49.8		53.2		46.5		43.2		69.0		31.7