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Common Equity
12 Months Ended
Dec. 31, 2019
Schedule of Common Equity [Line Items]  
Common Equity COMMON EQUITY
Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:
 
2019
 
2018
 
2017
Shares outstanding, January 1
236,063,279

 
231,348,646

 
227,673,654

Equity forward agreements
8,358,973

 

 

At-the-market offering programs

 
4,171,013

 
3,074,931

Shareowner Direct Plan
501,808

 
576,965

 
640,723

Equity-based compensation plans
101,478

 
5,078

 
5,185

Other
(2,738
)
 
(38,423
)
 
(45,847
)
Shares outstanding, December 31
245,022,800

 
236,063,279

 
231,348,646



At December 31, 2019, Alliant Energy had a total of 12.1 million shares available for issuance in the aggregate, pursuant to its Amended and Restated OIP, Shareowner Direct Plan and 401(k) Savings Plan.

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. In 2019, Alliant Energy settled $366 million under the forward sale agreements by delivering 8,358,973 shares of newly issued Alliant Energy common stock at a weighted average forward sale price of $43.75 per share. Alliant Energy used the net proceeds from the settlements for general corporate purposes.

In November 2019, Alliant Energy entered into forward sale agreements with a counterparty in connection with a public offering of 4,275,127 shares of Alliant Energy common stock. In the forward sale transaction, the counterparty, or its affiliates, borrowed an aggregate of 4,275,127 shares of Alliant Energy common stock from third parties and sold such shares to the related underwriter. Alliant Energy has not yet received any proceeds from this offering and no amounts have been or will be recorded in equity on Alliant Energy’s balance sheets until the forward sale agreements settle. Alliant Energy expects to settle the forward sale agreements prior to December 31, 2020 through physical delivery of shares of common stock in exchange for cash proceeds at the then-applicable forward sale price; however, Alliant Energy may elect cash settlement or net share settlement for all or a portion of the obligations under the forward sale agreements. The initial forward sale price of $52.235 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 agreement.

Alliant Energy has concluded that the forward sale agreements meet the derivative scope exception for certain contracts involving an entity’s own equity. Until settlement of the forward sale agreements, Alliant Energy’s EPS dilution resulting from the agreements, if any, is determined using the treasury stock method. Share dilution occurs when the average market price of Alliant Energy stock during the reporting period is higher than the forward sale price as of the end of the reporting period. As of December 31, 2019, 67,689 incremental shares were included in the calculation of diluted EPS related to the securities under the forward sale agreements.

At-the-Market Offering Programs - In 2018 and 2017, Alliant Energy filed prospectus supplements under which it could sell up to $175 million and $125 million of its common stock, respectively, through at-the-market offering programs. In 2018, Alliant Energy issued 4,171,013 shares of common stock through this program and received cash proceeds of $173 million, net of $2 million in commissions and fees. In 2017, Alliant Energy issued 3,074,931 shares of common stock through this program and received cash proceeds of $124 million, net of $1 million in commissions and fees. The 2017 and 2018 at-the-market offering programs have expired.

Shareowner Direct Plan - Alliant Energy satisfies its requirements under the Shareowner Direct Plan (dividend reinvestment and stock purchase plan) by acquiring Alliant Energy common stock through original issue, rather than on the open market.

Comprehensive Income (Loss) - In 2019, 2018 and 2017, Alliant Energy’s other comprehensive income (loss) was ($0.4) million, $2.2 million and ($0.1) million, respectively; 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. In 2019, 2018 and 2017, IPL and WPL had no other comprehensive income; therefore their comprehensive income was equal to their net income, and IPL’s comprehensive income available for common stock was equal to its net income available for common stock, for such periods.
IPL [Member]  
Schedule of Common Equity [Line Items]  
Common Equity COMMON EQUITY
Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:
 
2019
 
2018
 
2017
Shares outstanding, January 1
236,063,279

 
231,348,646

 
227,673,654

Equity forward agreements
8,358,973

 

 

At-the-market offering programs

 
4,171,013

 
3,074,931

Shareowner Direct Plan
501,808

 
576,965

 
640,723

Equity-based compensation plans
101,478

 
5,078

 
5,185

Other
(2,738
)
 
(38,423
)
 
(45,847
)
Shares outstanding, December 31
245,022,800

 
236,063,279

 
231,348,646



At December 31, 2019, Alliant Energy had a total of 12.1 million shares available for issuance in the aggregate, pursuant to its Amended and Restated OIP, Shareowner Direct Plan and 401(k) Savings Plan.

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. In 2019, Alliant Energy settled $366 million under the forward sale agreements by delivering 8,358,973 shares of newly issued Alliant Energy common stock at a weighted average forward sale price of $43.75 per share. Alliant Energy used the net proceeds from the settlements for general corporate purposes.

In November 2019, Alliant Energy entered into forward sale agreements with a counterparty in connection with a public offering of 4,275,127 shares of Alliant Energy common stock. In the forward sale transaction, the counterparty, or its affiliates, borrowed an aggregate of 4,275,127 shares of Alliant Energy common stock from third parties and sold such shares to the related underwriter. Alliant Energy has not yet received any proceeds from this offering and no amounts have been or will be recorded in equity on Alliant Energy’s balance sheets until the forward sale agreements settle. Alliant Energy expects to settle the forward sale agreements prior to December 31, 2020 through physical delivery of shares of common stock in exchange for cash proceeds at the then-applicable forward sale price; however, Alliant Energy may elect cash settlement or net share settlement for all or a portion of the obligations under the forward sale agreements. The initial forward sale price of $52.235 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 agreement.

Alliant Energy has concluded that the forward sale agreements meet the derivative scope exception for certain contracts involving an entity’s own equity. Until settlement of the forward sale agreements, Alliant Energy’s EPS dilution resulting from the agreements, if any, is determined using the treasury stock method. Share dilution occurs when the average market price of Alliant Energy stock during the reporting period is higher than the forward sale price as of the end of the reporting period. As of December 31, 2019, 67,689 incremental shares were included in the calculation of diluted EPS related to the securities under the forward sale agreements.

At-the-Market Offering Programs - In 2018 and 2017, Alliant Energy filed prospectus supplements under which it could sell up to $175 million and $125 million of its common stock, respectively, through at-the-market offering programs. In 2018, Alliant Energy issued 4,171,013 shares of common stock through this program and received cash proceeds of $173 million, net of $2 million in commissions and fees. In 2017, Alliant Energy issued 3,074,931 shares of common stock through this program and received cash proceeds of $124 million, net of $1 million in commissions and fees. The 2017 and 2018 at-the-market offering programs have expired.

Shareowner Direct Plan - Alliant Energy satisfies its requirements under the Shareowner Direct Plan (dividend reinvestment and stock purchase plan) by acquiring Alliant Energy common stock through original issue, rather than on the open market.

Comprehensive Income (Loss) - In 2019, 2018 and 2017, Alliant Energy’s other comprehensive income (loss) was ($0.4) million, $2.2 million and ($0.1) million, respectively; 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. In 2019, 2018 and 2017, IPL and WPL had no other comprehensive income; therefore their comprehensive income was equal to their net income, and IPL’s comprehensive income available for common stock was equal to its net income available for common stock, for such periods.
WPL [Member]  
Schedule of Common Equity [Line Items]  
Common Equity COMMON EQUITY
Common Share Activity - A summary of Alliant Energy’s common stock activity was as follows:
 
2019
 
2018
 
2017
Shares outstanding, January 1
236,063,279

 
231,348,646

 
227,673,654

Equity forward agreements
8,358,973

 

 

At-the-market offering programs

 
4,171,013

 
3,074,931

Shareowner Direct Plan
501,808

 
576,965

 
640,723

Equity-based compensation plans
101,478

 
5,078

 
5,185

Other
(2,738
)
 
(38,423
)
 
(45,847
)
Shares outstanding, December 31
245,022,800

 
236,063,279

 
231,348,646



At December 31, 2019, Alliant Energy had a total of 12.1 million shares available for issuance in the aggregate, pursuant to its Amended and Restated OIP, Shareowner Direct Plan and 401(k) Savings Plan.

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. In 2019, Alliant Energy settled $366 million under the forward sale agreements by delivering 8,358,973 shares of newly issued Alliant Energy common stock at a weighted average forward sale price of $43.75 per share. Alliant Energy used the net proceeds from the settlements for general corporate purposes.

In November 2019, Alliant Energy entered into forward sale agreements with a counterparty in connection with a public offering of 4,275,127 shares of Alliant Energy common stock. In the forward sale transaction, the counterparty, or its affiliates, borrowed an aggregate of 4,275,127 shares of Alliant Energy common stock from third parties and sold such shares to the related underwriter. Alliant Energy has not yet received any proceeds from this offering and no amounts have been or will be recorded in equity on Alliant Energy’s balance sheets until the forward sale agreements settle. Alliant Energy expects to settle the forward sale agreements prior to December 31, 2020 through physical delivery of shares of common stock in exchange for cash proceeds at the then-applicable forward sale price; however, Alliant Energy may elect cash settlement or net share settlement for all or a portion of the obligations under the forward sale agreements. The initial forward sale price of $52.235 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 agreement.

Alliant Energy has concluded that the forward sale agreements meet the derivative scope exception for certain contracts involving an entity’s own equity. Until settlement of the forward sale agreements, Alliant Energy’s EPS dilution resulting from the agreements, if any, is determined using the treasury stock method. Share dilution occurs when the average market price of Alliant Energy stock during the reporting period is higher than the forward sale price as of the end of the reporting period. As of December 31, 2019, 67,689 incremental shares were included in the calculation of diluted EPS related to the securities under the forward sale agreements.

At-the-Market Offering Programs - In 2018 and 2017, Alliant Energy filed prospectus supplements under which it could sell up to $175 million and $125 million of its common stock, respectively, through at-the-market offering programs. In 2018, Alliant Energy issued 4,171,013 shares of common stock through this program and received cash proceeds of $173 million, net of $2 million in commissions and fees. In 2017, Alliant Energy issued 3,074,931 shares of common stock through this program and received cash proceeds of $124 million, net of $1 million in commissions and fees. The 2017 and 2018 at-the-market offering programs have expired.

Shareowner Direct Plan - Alliant Energy satisfies its requirements under the Shareowner Direct Plan (dividend reinvestment and stock purchase plan) by acquiring Alliant Energy common stock through original issue, rather than on the open market.

Comprehensive Income (Loss) - In 2019, 2018 and 2017, Alliant Energy’s other comprehensive income (loss) was ($0.4) million, $2.2 million and ($0.1) million, respectively; 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. In 2019, 2018 and 2017, IPL and WPL had no other comprehensive income; therefore their comprehensive income was equal to their net income, and IPL’s comprehensive income available for common stock was equal to its net income available for common stock, for such periods.