Common Equity

3 Months Ended

Mar. 31, 2019

COMMON EQUITY

Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:



Shares outstanding, January 1, 2019	236,063,279
Equity forward agreements	1,090,300
Shareowner Direct Plan issuances	142,090
Equity-based compensation plans	101,478
Other	(2,738	)
Shares outstanding, March 31, 2019	237,394,409

Equity Forward Agreements - In December 2018, Alliant Energy entered into forward sale agreements with various counterparties in connection with a public offering of 8,358,973 shares of Alliant Energy common stock. The initial forward sale price of $44.33 per share is subject to daily adjustment based on a floating interest rate factor, and will decrease by other fixed amounts specified in the forward sale agreements. In the first quarter of 2019, Alliant Energy settled $48 million under the forward sale agreements by delivering 1,090,300 shares of newly issued Alliant Energy common stock at a forward sale price of $44.13 per share. Alliant Energy used the net proceeds from the settlement for general corporate purposes. As of March 31, 2019, 96,261 shares were included in the calculation of diluted EPS related to the remaining securities under the forward sale agreements.

Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):



Alliant Energy	Total Alliant Energy Common Equity
									Accumulated			Shares in			Cumulative
			Additional						Other			Deferred			Preferred
	Common		Paid-In			Retained			Comprehensive			Compensation			Stock		Total
	Stock		Capital			Earnings			Income (Loss)			Trust			of IPL		Equity
Three Months Ended March 31, 2019
Beginning balance, January 1		$2.4		$2,045.5			$2,545.9			$1.7			($9.8	)		$200.0		$4,785.7
Net income attributable to Alliant Energy common shareowners						125.1											125.1
Common stock dividends ($0.355 per share)						(83.7		)									(83.7		)
Equity forward settlements and Shareowner Direct Plan issuances			54.6														54.6
Equity-based compensation plans and other			(0.1		)							0.1					—
Other comprehensive income, net of tax									0.7								0.7
Ending balance, March 31		$2.4		$2,100.0			$2,587.3			$2.4			($9.7	)		$200.0		$4,882.4
Three Months Ended March 31, 2018
Beginning balance, January 1		$2.3		$1,845.5			$2,346.0			($0.5	)		($11.1	)		$200.0		$4,382.2
Net income attributable to Alliant Energy common shareowners						120.9											120.9
Common stock dividends ($0.335 per share)						(77.5		)									(77.5		)
Shareowner Direct Plan issuances			6.3														6.3
Equity-based compensation plans			(0.4		)												(0.4		)
Ending balance, March 31		$2.3		$1,851.4			$2,389.4			($0.5	)		($11.1	)		$200.0		$4,431.5



IPL	Total IPL Common Equity
			Additional					Cumulative
	Common		Paid-In		Retained			Preferred		Total
	Stock		Capital		Earnings			Stock		Equity
Three Months Ended March 31, 2019
Beginning balance, January 1		$33.4		$2,222.8		$774.5			$200.0		$3,230.7
Earnings available for common stock					53.3					53.3
Common stock dividends					(42.0		)			(42.0		)
Capital contribution from parent			100.0							100.0
Ending balance, March 31		$33.4		$2,322.8		$785.8			$200.0		$3,342.0
Three Months Ended March 31, 2018
Beginning balance, January 1		$33.4		$1,797.8		$678.5			$200.0		$2,709.7
Earnings available for common stock					46.7					46.7
Common stock dividends					(41.9		)			(41.9		)
Ending balance, March 31		$33.4		$1,797.8		$683.3			$200.0		$2,714.5



WPL			Additional					Total
	Common		Paid-In		Retained			Common
	Stock		Capital		Earnings			Equity
Three Months Ended March 31, 2019
Beginning balance, January 1		$66.2		$1,309.0		$774.3			$2,149.5
Earnings available for common stock					65.7			65.7
Common stock dividends					(36.0		)	(36.0		)
Ending balance, March 31		$66.2		$1,309.0		$804.0			$2,179.2
Three Months Ended March 31, 2018
Beginning balance, January 1		$66.2		$1,109.0		$706.3			$1,881.5
Earnings available for common stock					54.0			54.0
Common stock dividends					(35.0		)	(35.0		)
Ending balance, March 31		$66.2		$1,109.0		$725.3			$1,900.5

Comprehensive Income - For the three months ended March 31, 2019 and 2018, Alliant Energy’s other comprehensive income was not material; therefore, its comprehensive income was substantially equal to its net income and its comprehensive income attributable to Alliant Energy common shareowners was substantially equal to its net income attributable to Alliant Energy common shareowners for such periods. For the three months ended March 31, 2019 and 2018, IPL and WPL had no other comprehensive income; therefore, their comprehensive income was equal to their net income and their comprehensive income available for common stock was equal to their earnings available for common stock for such periods.

IPL [Member]

Common Equity [Line Items]

Common Equity

COMMON EQUITY

Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:



Shares outstanding, January 1, 2019	236,063,279
Equity forward agreements	1,090,300
Shareowner Direct Plan issuances	142,090
Equity-based compensation plans	101,478
Other	(2,738	)
Shares outstanding, March 31, 2019	237,394,409

Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):



Alliant Energy	Total Alliant Energy Common Equity
									Accumulated			Shares in			Cumulative
			Additional						Other			Deferred			Preferred
	Common		Paid-In			Retained			Comprehensive			Compensation			Stock		Total
	Stock		Capital			Earnings			Income (Loss)			Trust			of IPL		Equity
Three Months Ended March 31, 2019
Beginning balance, January 1		$2.4		$2,045.5			$2,545.9			$1.7			($9.8	)		$200.0		$4,785.7
Net income attributable to Alliant Energy common shareowners						125.1											125.1
Common stock dividends ($0.355 per share)						(83.7		)									(83.7		)
Equity forward settlements and Shareowner Direct Plan issuances			54.6														54.6
Equity-based compensation plans and other			(0.1		)							0.1					—
Other comprehensive income, net of tax									0.7								0.7
Ending balance, March 31		$2.4		$2,100.0			$2,587.3			$2.4			($9.7	)		$200.0		$4,882.4
Three Months Ended March 31, 2018
Beginning balance, January 1		$2.3		$1,845.5			$2,346.0			($0.5	)		($11.1	)		$200.0		$4,382.2
Net income attributable to Alliant Energy common shareowners						120.9											120.9
Common stock dividends ($0.335 per share)						(77.5		)									(77.5		)
Shareowner Direct Plan issuances			6.3														6.3
Equity-based compensation plans			(0.4		)												(0.4		)
Ending balance, March 31		$2.3		$1,851.4			$2,389.4			($0.5	)		($11.1	)		$200.0		$4,431.5



IPL	Total IPL Common Equity
			Additional					Cumulative
	Common		Paid-In		Retained			Preferred		Total
	Stock		Capital		Earnings			Stock		Equity
Three Months Ended March 31, 2019
Beginning balance, January 1		$33.4		$2,222.8		$774.5			$200.0		$3,230.7
Earnings available for common stock					53.3					53.3
Common stock dividends					(42.0		)			(42.0		)
Capital contribution from parent			100.0							100.0
Ending balance, March 31		$33.4		$2,322.8		$785.8			$200.0		$3,342.0
Three Months Ended March 31, 2018
Beginning balance, January 1		$33.4		$1,797.8		$678.5			$200.0		$2,709.7
Earnings available for common stock					46.7					46.7
Common stock dividends					(41.9		)			(41.9		)
Ending balance, March 31		$33.4		$1,797.8		$683.3			$200.0		$2,714.5



WPL			Additional					Total
	Common		Paid-In		Retained			Common
	Stock		Capital		Earnings			Equity
Three Months Ended March 31, 2019
Beginning balance, January 1		$66.2		$1,309.0		$774.3			$2,149.5
Earnings available for common stock					65.7			65.7
Common stock dividends					(36.0		)	(36.0		)
Ending balance, March 31		$66.2		$1,309.0		$804.0			$2,179.2
Three Months Ended March 31, 2018
Beginning balance, January 1		$66.2		$1,109.0		$706.3			$1,881.5
Earnings available for common stock					54.0			54.0
Common stock dividends					(35.0		)	(35.0		)
Ending balance, March 31		$66.2		$1,109.0		$725.3			$1,900.5

WPL [Member]

Common Equity [Line Items]

Common Equity

COMMON EQUITY

Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:



Shares outstanding, January 1, 2019	236,063,279
Equity forward agreements	1,090,300
Shareowner Direct Plan issuances	142,090
Equity-based compensation plans	101,478
Other	(2,738	)
Shares outstanding, March 31, 2019	237,394,409

Changes in Shareowners’ Equity - A summary of changes in shareowners’ equity was as follows (in millions):



Alliant Energy	Total Alliant Energy Common Equity
									Accumulated			Shares in			Cumulative
			Additional						Other			Deferred			Preferred
	Common		Paid-In			Retained			Comprehensive			Compensation			Stock		Total
	Stock		Capital			Earnings			Income (Loss)			Trust			of IPL		Equity
Three Months Ended March 31, 2019
Beginning balance, January 1		$2.4		$2,045.5			$2,545.9			$1.7			($9.8	)		$200.0		$4,785.7
Net income attributable to Alliant Energy common shareowners						125.1											125.1
Common stock dividends ($0.355 per share)						(83.7		)									(83.7		)
Equity forward settlements and Shareowner Direct Plan issuances			54.6														54.6
Equity-based compensation plans and other			(0.1		)							0.1					—
Other comprehensive income, net of tax									0.7								0.7
Ending balance, March 31		$2.4		$2,100.0			$2,587.3			$2.4			($9.7	)		$200.0		$4,882.4
Three Months Ended March 31, 2018
Beginning balance, January 1		$2.3		$1,845.5			$2,346.0			($0.5	)		($11.1	)		$200.0		$4,382.2
Net income attributable to Alliant Energy common shareowners						120.9											120.9
Common stock dividends ($0.335 per share)						(77.5		)									(77.5		)
Shareowner Direct Plan issuances			6.3														6.3
Equity-based compensation plans			(0.4		)												(0.4		)
Ending balance, March 31		$2.3		$1,851.4			$2,389.4			($0.5	)		($11.1	)		$200.0		$4,431.5



IPL	Total IPL Common Equity
			Additional					Cumulative
	Common		Paid-In		Retained			Preferred		Total
	Stock		Capital		Earnings			Stock		Equity
Three Months Ended March 31, 2019
Beginning balance, January 1		$33.4		$2,222.8		$774.5			$200.0		$3,230.7
Earnings available for common stock					53.3					53.3
Common stock dividends					(42.0		)			(42.0		)
Capital contribution from parent			100.0							100.0
Ending balance, March 31		$33.4		$2,322.8		$785.8			$200.0		$3,342.0
Three Months Ended March 31, 2018
Beginning balance, January 1		$33.4		$1,797.8		$678.5			$200.0		$2,709.7
Earnings available for common stock					46.7					46.7
Common stock dividends					(41.9		)			(41.9		)
Ending balance, March 31		$33.4		$1,797.8		$683.3			$200.0		$2,714.5



WPL			Additional					Total
	Common		Paid-In		Retained			Common
	Stock		Capital		Earnings			Equity
Three Months Ended March 31, 2019
Beginning balance, January 1		$66.2		$1,309.0		$774.3			$2,149.5
Earnings available for common stock					65.7			65.7
Common stock dividends					(36.0		)	(36.0		)
Ending balance, March 31		$66.2		$1,309.0		$804.0			$2,179.2
Three Months Ended March 31, 2018
Beginning balance, January 1		$66.2		$1,109.0		$706.3			$1,881.5
Earnings available for common stock					54.0			54.0
Common stock dividends					(35.0		)	(35.0		)
Ending balance, March 31		$66.2		$1,109.0		$725.3			$1,900.5