BENEFIT PLANS

NOTE 10(a) Pension and OPEB Plans -

Net Periodic Benefit Costs - The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included below (in millions). For IPL and WPL, amounts are for their plan participants covered under plans they sponsor, as well as amounts directly assigned to them related to certain participants in the Alliant Energy and Corporate Services sponsored plans.


	Defined Benefit Pension Plans				OPEB Plans
	Three Months		Nine Months		Three Months		Nine Months
Alliant Energy	2021	2020	2021	2020	2021	2020	2021	2020
Service cost	$2	$3	$8	$8	$1	$1	$3	$3
Interest cost	9	10	26	32	1	2	3	5
Expected return on plan assets	(17)	(17)	(51)	(52)	(1)	(1)	(3)	(4)
Amortization of prior service credit	(1)	—	(1)	—	—	—	—	—
Amortization of actuarial loss	10	9	29	26	1	—	3	2

Settlement losses (a)	—	—	—	4	—	—	—	—
	$3	$5	$11	$18	$2	$2	$6	$6


	Defined Benefit Pension Plans				OPEB Plans
	Three Months		Nine Months		Three Months		Nine Months
IPL	2021	2020	2021	2020	2021	2020	2021	2020
Service cost	$1	$2	$5	$5	$—	$—	$1	$1
Interest cost	4	5	12	15	1	1	2	2
Expected return on plan assets	(8)	(8)	(24)	(24)	(1)	(1)	(3)	(3)

Amortization of actuarial loss	5	4	13	11	—	—	1	1
	$2	$3	$6	$7	$—	$—	$1	$1


	Defined Benefit Pension Plans				OPEB Plans
	Three Months		Nine Months		Three Months		Nine Months
WPL	2021	2020	2021	2020	2021	2020	2021	2020
Service cost	$1	$1	$3	$3	$1	$—	$1	$1
Interest cost	3	5	11	14	—	1	1	2
Expected return on plan assets	(8)	(8)	(23)	(23)	—	(1)	—	(1)

Amortization of actuarial loss	5	4	14	12	1	1	2	2

	$1	$2	$5	$6	$2	$1	$4	$4

(a)Settlement losses related to payments made to retired executives of Alliant Energy.

NOTE 10(b) Equity-based Compensation Plans - A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions):


	Alliant Energy				IPL				WPL
	Three Months		Nine Months		Three Months		Nine Months		Three Months		Nine Months
	2021	2020	2021	2020	2021	2020	2021	2020	2021	2020	2021	2020
Compensation expense	$4	$5	$9	$10	$2	$3	$5	$6	$2	$2	$4	$4
Income tax benefits	1	1	3	3	—	1	1	2	—	—	1	1

As of September 30, 2021, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $7 million, $4 million and $3 million, respectively, which is expected to be recognized over a weighted average period of between 1 year and 2 years.

For the nine months ended September 30, 2021, performance shares, performance restricted stock units and restricted stock units were granted to key employees as follows. These shares and units will be paid out in shares of common stock, and are therefore accounted for as equity awards.


		Weighted Average
	Grants	Grant Date Fair Value
Performance shares	73,112	$46.19
Performance restricted stock units	73,112	48.66
Restricted stock units	80,152	48.65

As of September 30, 2021, 491,406 shares were included in the calculation of diluted EPS related to the nonvested equity awards.

Benefit Plans

BENEFIT PLANS

NOTE 10(a) Pension and OPEB Plans -

Net Periodic Benefit Costs - The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included below (in millions). For IPL and WPL, amounts are for their plan participants covered under plans they sponsor, as well as amounts directly assigned to them related to certain participants in the Alliant Energy and Corporate Services sponsored plans.


	Defined Benefit Pension Plans				OPEB Plans
	Three Months		Nine Months		Three Months		Nine Months
Alliant Energy	2021	2020	2021	2020	2021	2020	2021	2020
Service cost	$2	$3	$8	$8	$1	$1	$3	$3
Interest cost	9	10	26	32	1	2	3	5
Expected return on plan assets	(17)	(17)	(51)	(52)	(1)	(1)	(3)	(4)
Amortization of prior service credit	(1)	—	(1)	—	—	—	—	—
Amortization of actuarial loss	10	9	29	26	1	—	3	2

Settlement losses (a)	—	—	—	4	—	—	—	—
	$3	$5	$11	$18	$2	$2	$6	$6


	Defined Benefit Pension Plans				OPEB Plans
	Three Months		Nine Months		Three Months		Nine Months
IPL	2021	2020	2021	2020	2021	2020	2021	2020
Service cost	$1	$2	$5	$5	$—	$—	$1	$1
Interest cost	4	5	12	15	1	1	2	2
Expected return on plan assets	(8)	(8)	(24)	(24)	(1)	(1)	(3)	(3)

Amortization of actuarial loss	5	4	13	11	—	—	1	1
	$2	$3	$6	$7	$—	$—	$1	$1


	Defined Benefit Pension Plans				OPEB Plans
	Three Months		Nine Months		Three Months		Nine Months
WPL	2021	2020	2021	2020	2021	2020	2021	2020
Service cost	$1	$1	$3	$3	$1	$—	$1	$1
Interest cost	3	5	11	14	—	1	1	2
Expected return on plan assets	(8)	(8)	(23)	(23)	—	(1)	—	(1)

Amortization of actuarial loss	5	4	14	12	1	1	2	2

	$1	$2	$5	$6	$2	$1	$4	$4

(a)Settlement losses related to payments made to retired executives of Alliant Energy.

NOTE 10(b) Equity-based Compensation Plans - A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions):


	Alliant Energy				IPL				WPL
	Three Months		Nine Months		Three Months		Nine Months		Three Months		Nine Months
	2021	2020	2021	2020	2021	2020	2021	2020	2021	2020	2021	2020
Compensation expense	$4	$5	$9	$10	$2	$3	$5	$6	$2	$2	$4	$4
Income tax benefits	1	1	3	3	—	1	1	2	—	—	1	1

As of September 30, 2021, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $7 million, $4 million and $3 million, respectively, which is expected to be recognized over a weighted average period of between 1 year and 2 years.

For the nine months ended September 30, 2021, performance shares, performance restricted stock units and restricted stock units were granted to key employees as follows. These shares and units will be paid out in shares of common stock, and are therefore accounted for as equity awards.


		Weighted Average
	Grants	Grant Date Fair Value
Performance shares	73,112	$46.19
Performance restricted stock units	73,112	48.66
Restricted stock units	80,152	48.65

As of September 30, 2021, 491,406 shares were included in the calculation of diluted EPS related to the nonvested equity awards.

Benefit Plans

BENEFIT PLANS

NOTE 10(a) Pension and OPEB Plans -

Net Periodic Benefit Costs - The components of net periodic benefit costs for sponsored defined benefit pension and OPEB plans for the three and nine months ended September 30 are included below (in millions). For IPL and WPL, amounts are for their plan participants covered under plans they sponsor, as well as amounts directly assigned to them related to certain participants in the Alliant Energy and Corporate Services sponsored plans.


	Defined Benefit Pension Plans				OPEB Plans
	Three Months		Nine Months		Three Months		Nine Months
Alliant Energy	2021	2020	2021	2020	2021	2020	2021	2020
Service cost	$2	$3	$8	$8	$1	$1	$3	$3
Interest cost	9	10	26	32	1	2	3	5
Expected return on plan assets	(17)	(17)	(51)	(52)	(1)	(1)	(3)	(4)
Amortization of prior service credit	(1)	—	(1)	—	—	—	—	—
Amortization of actuarial loss	10	9	29	26	1	—	3	2

Settlement losses (a)	—	—	—	4	—	—	—	—
	$3	$5	$11	$18	$2	$2	$6	$6


	Defined Benefit Pension Plans				OPEB Plans
	Three Months		Nine Months		Three Months		Nine Months
IPL	2021	2020	2021	2020	2021	2020	2021	2020
Service cost	$1	$2	$5	$5	$—	$—	$1	$1
Interest cost	4	5	12	15	1	1	2	2
Expected return on plan assets	(8)	(8)	(24)	(24)	(1)	(1)	(3)	(3)

Amortization of actuarial loss	5	4	13	11	—	—	1	1
	$2	$3	$6	$7	$—	$—	$1	$1


	Defined Benefit Pension Plans				OPEB Plans
	Three Months		Nine Months		Three Months		Nine Months
WPL	2021	2020	2021	2020	2021	2020	2021	2020
Service cost	$1	$1	$3	$3	$1	$—	$1	$1
Interest cost	3	5	11	14	—	1	1	2
Expected return on plan assets	(8)	(8)	(23)	(23)	—	(1)	—	(1)

Amortization of actuarial loss	5	4	14	12	1	1	2	2

	$1	$2	$5	$6	$2	$1	$4	$4

(a)Settlement losses related to payments made to retired executives of Alliant Energy.

NOTE 10(b) Equity-based Compensation Plans - A summary of compensation expense, including amounts allocated to IPL and WPL, and the related income tax benefits recognized for share-based compensation awards for the three and nine months ended September 30 was as follows (in millions):


	Alliant Energy				IPL				WPL
	Three Months		Nine Months		Three Months		Nine Months		Three Months		Nine Months
	2021	2020	2021	2020	2021	2020	2021	2020	2021	2020	2021	2020
Compensation expense	$4	$5	$9	$10	$2	$3	$5	$6	$2	$2	$4	$4
Income tax benefits	1	1	3	3	—	1	1	2	—	—	1	1

As of September 30, 2021, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $7 million, $4 million and $3 million, respectively, which is expected to be recognized over a weighted average period of between 1 year and 2 years.

For the nine months ended September 30, 2021, performance shares, performance restricted stock units and restricted stock units were granted to key employees as follows. These shares and units will be paid out in shares of common stock, and are therefore accounted for as equity awards.


		Weighted Average
	Grants	Grant Date Fair Value
Performance shares	73,112	$46.19
Performance restricted stock units	73,112	48.66
Restricted stock units	80,152	48.65

As of September 30, 2021, 491,406 shares were included in the calculation of diluted EPS related to the nonvested equity awards.