Selected Consolidated Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

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.

	2019								2018
	March 31		June 30		Sep. 30		Dec. 31		March 31		June 30		Sep. 30		Dec. 31
	(in millions, except per share data)
Revenues		$987.2		$790.2		$990.2		$880.1		$916.3		$816.1		$928.6		$873.5
Operating income	176.8		149.8		290.2		160.9		165.7		151.2		256.1		121.4
Net income attributable to Alliant Energy common shareowners	125.1		94.6		226.0		111.5		120.9		100.4		205.5		85.3
Earnings per weighted average common share attributable to Alliant Energy common shareowners	0.53		0.40		0.94		0.46		0.52		0.43		0.87		0.36

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.

	2019								2018
	March 31		June 30		Sep. 30		Dec. 31		March 31		June 30		Sep. 30		Dec. 31
	(in millions)
Revenues		$555.1		$441.2		$596.5		$496.8		$525.8		$474.8		$547.6		$494.1
Operating income	73.5		74.5		173.5		81.3		75.6		77.7		143.1		54.4
Net income	55.9		47.5		143.7		47.2		49.3		54.2		129.1		41.6
Net income available for common stock	53.3		45.0		141.1		44.7		46.7		51.7		126.5		39.1

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.

	2019								2018
	March 31		June 30		Sep. 30		Dec. 31		March 31		June 30		Sep. 30		Dec. 31
	(in millions)
Revenues		$415.2		$326.1		$372.1		$362.3		$381.7		$330.8		$370.7		$369.4
Operating income	98.1		67.0		108.3		73.8		84.0		63.4		104.2		61.3
Net income	65.7		42.0		75.5		49.8		54.0		39.8		76.3		38.0