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Benefit Plans | 6 Months Ended
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Jun. 30, 2022
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 six months ended June 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 |  | Six Months |  | Three Months |  | Six Months
Alliant Energy | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $2 |  | $3 |  | $4 |  | $6 |  | $1 |  | $1 |  | $2 |  | $2
Interest cost | 9 |  | 9 |  | 18 |  | 17 |  | 2 |  | 1 |  | 3 |  | 2
Expected return on plan assets | (17) |  | (17) |  | (34) |  | (34) |  | (2) |  | (1) |  | (3) |  | (2)
Amortization of actuarial loss | 8 |  | 9 |  | 16 |  | 19 |  | — |  | 1 |  | 1 |  | 2
| $2 |  | $4 |  | $4 |  | $8 |  | $1 |  | $2 |  | $3 |  | $4
| Defined Benefit Pension Plans |  | OPEB Plans
| Three Months |  | Six Months |  | Three Months |  | Six Months
IPL | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $1 |  | $2 |  | $3 |  | $4 |  | $1 |  | $1 |  | $1 |  | $1
Interest cost | 4 |  | 4 |  | 8 |  | 8 |  | — |  | — |  | 1 |  | 1
Expected return on plan assets | (8) |  | (8) |  | (16) |  | (16) |  | (1) |  | (1) |  | (2) |  | (2)
Amortization of actuarial loss | 4 |  | 4 |  | 7 |  | 8 |  | — |  | 1 |  | — |  | 1
| $1 |  | $2 |  | $2 |  | $4 |  | $— |  | $1 |  | $— |  | $1
| Defined Benefit Pension Plans |  | OPEB Plans
| Three Months |  | Six Months |  | Three Months |  | Six Months
WPL | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $1 |  | $1 |  | $2 |  | $2 |  | $— |  | $— |  | $— |  | $—
Interest cost | 4 |  | 4 |  | 8 |  | 8 |  | — |  | 1 |  | 1 |  | 1
Expected return on plan assets | (8) |  | (7) |  | (16) |  | (15) |  | — |  | — |  | — |  | —
Amortization of actuarial loss | 4 |  | 4 |  | 8 |  | 9 |  | 1 |  | — |  | 1 |  | 1
| $1 |  | $2 |  | $2 |  | $4 |  | $1 |  | $1 |  | $2 |  | $2
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 six months ended June 30 was as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| Three Months |  | Six Months |  | Three Months |  | Six Months |  | Three Months |  | Six Months
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Compensation expense | $3 |  | $2 |  | $7 |  | $5 |  | $1 |  | $2 |  | $4 |  | $3 |  | $1 |  | $1 |  | $3 |  | $2
Income tax benefits | 1 |  | 1 |  | 2 |  | 2 |  | — |  | 1 |  | 1 |  | 1 |  | — |  | 1 |  | 1 |  | 1
As of June 30, 2022, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $11 million, $6 million and $5 million, respectively, which is expected to be recognized over a weighted average period of between 1 year and 2 years. For the six months ended June 30, 2022, performance shares, performance restricted stock units and restricted stock units were granted to key employees under existing plans 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 | 73,762 |  | $54.45
Performance restricted stock units | 84,277 |  | 56.97
Restricted stock units | 76,876 |  | 56.86
As of June 30, 2022, 261,301 shares were included in the calculation of diluted EPS related to the nonvested equity awards.
IPL [Member] |
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 six months ended June 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 |  | Six Months |  | Three Months |  | Six Months
Alliant Energy | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $2 |  | $3 |  | $4 |  | $6 |  | $1 |  | $1 |  | $2 |  | $2
Interest cost | 9 |  | 9 |  | 18 |  | 17 |  | 2 |  | 1 |  | 3 |  | 2
Expected return on plan assets | (17) |  | (17) |  | (34) |  | (34) |  | (2) |  | (1) |  | (3) |  | (2)
Amortization of actuarial loss | 8 |  | 9 |  | 16 |  | 19 |  | — |  | 1 |  | 1 |  | 2
| $2 |  | $4 |  | $4 |  | $8 |  | $1 |  | $2 |  | $3 |  | $4
| Defined Benefit Pension Plans |  | OPEB Plans
| Three Months |  | Six Months |  | Three Months |  | Six Months
IPL | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $1 |  | $2 |  | $3 |  | $4 |  | $1 |  | $1 |  | $1 |  | $1
Interest cost | 4 |  | 4 |  | 8 |  | 8 |  | — |  | — |  | 1 |  | 1
Expected return on plan assets | (8) |  | (8) |  | (16) |  | (16) |  | (1) |  | (1) |  | (2) |  | (2)
Amortization of actuarial loss | 4 |  | 4 |  | 7 |  | 8 |  | — |  | 1 |  | — |  | 1
| $1 |  | $2 |  | $2 |  | $4 |  | $— |  | $1 |  | $— |  | $1
| Defined Benefit Pension Plans |  | OPEB Plans
| Three Months |  | Six Months |  | Three Months |  | Six Months
WPL | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $1 |  | $1 |  | $2 |  | $2 |  | $— |  | $— |  | $— |  | $—
Interest cost | 4 |  | 4 |  | 8 |  | 8 |  | — |  | 1 |  | 1 |  | 1
Expected return on plan assets | (8) |  | (7) |  | (16) |  | (15) |  | — |  | — |  | — |  | —
Amortization of actuarial loss | 4 |  | 4 |  | 8 |  | 9 |  | 1 |  | — |  | 1 |  | 1
| $1 |  | $2 |  | $2 |  | $4 |  | $1 |  | $1 |  | $2 |  | $2
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 six months ended June 30 was as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| Three Months |  | Six Months |  | Three Months |  | Six Months |  | Three Months |  | Six Months
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Compensation expense | $3 |  | $2 |  | $7 |  | $5 |  | $1 |  | $2 |  | $4 |  | $3 |  | $1 |  | $1 |  | $3 |  | $2
Income tax benefits | 1 |  | 1 |  | 2 |  | 2 |  | — |  | 1 |  | 1 |  | 1 |  | — |  | 1 |  | 1 |  | 1
As of June 30, 2022, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $11 million, $6 million and $5 million, respectively, which is expected to be recognized over a weighted average period of between 1 year and 2 years. For the six months ended June 30, 2022, performance shares, performance restricted stock units and restricted stock units were granted to key employees under existing plans 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 | 73,762 |  | $54.45
Performance restricted stock units | 84,277 |  | 56.97
Restricted stock units | 76,876 |  | 56.86
As of June 30, 2022, 261,301 shares were included in the calculation of diluted EPS related to the nonvested equity awards.
WPL [Member] |
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 six months ended June 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 |  | Six Months |  | Three Months |  | Six Months
Alliant Energy | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $2 |  | $3 |  | $4 |  | $6 |  | $1 |  | $1 |  | $2 |  | $2
Interest cost | 9 |  | 9 |  | 18 |  | 17 |  | 2 |  | 1 |  | 3 |  | 2
Expected return on plan assets | (17) |  | (17) |  | (34) |  | (34) |  | (2) |  | (1) |  | (3) |  | (2)
Amortization of actuarial loss | 8 |  | 9 |  | 16 |  | 19 |  | — |  | 1 |  | 1 |  | 2
| $2 |  | $4 |  | $4 |  | $8 |  | $1 |  | $2 |  | $3 |  | $4
| Defined Benefit Pension Plans |  | OPEB Plans
| Three Months |  | Six Months |  | Three Months |  | Six Months
IPL | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $1 |  | $2 |  | $3 |  | $4 |  | $1 |  | $1 |  | $1 |  | $1
Interest cost | 4 |  | 4 |  | 8 |  | 8 |  | — |  | — |  | 1 |  | 1
Expected return on plan assets | (8) |  | (8) |  | (16) |  | (16) |  | (1) |  | (1) |  | (2) |  | (2)
Amortization of actuarial loss | 4 |  | 4 |  | 7 |  | 8 |  | — |  | 1 |  | — |  | 1
| $1 |  | $2 |  | $2 |  | $4 |  | $— |  | $1 |  | $— |  | $1
| Defined Benefit Pension Plans |  | OPEB Plans
| Three Months |  | Six Months |  | Three Months |  | Six Months
WPL | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $1 |  | $1 |  | $2 |  | $2 |  | $— |  | $— |  | $— |  | $—
Interest cost | 4 |  | 4 |  | 8 |  | 8 |  | — |  | 1 |  | 1 |  | 1
Expected return on plan assets | (8) |  | (7) |  | (16) |  | (15) |  | — |  | — |  | — |  | —
Amortization of actuarial loss | 4 |  | 4 |  | 8 |  | 9 |  | 1 |  | — |  | 1 |  | 1
| $1 |  | $2 |  | $2 |  | $4 |  | $1 |  | $1 |  | $2 |  | $2
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 six months ended June 30 was as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| Three Months |  | Six Months |  | Three Months |  | Six Months |  | Three Months |  | Six Months
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Compensation expense | $3 |  | $2 |  | $7 |  | $5 |  | $1 |  | $2 |  | $4 |  | $3 |  | $1 |  | $1 |  | $3 |  | $2
Income tax benefits | 1 |  | 1 |  | 2 |  | 2 |  | — |  | 1 |  | 1 |  | 1 |  | — |  | 1 |  | 1 |  | 1
As of June 30, 2022, Alliant Energy’s, IPL’s and WPL’s total unrecognized compensation cost related to share-based compensation awards was $11 million, $6 million and $5 million, respectively, which is expected to be recognized over a weighted average period of between 1 year and 2 years. For the six months ended June 30, 2022, performance shares, performance restricted stock units and restricted stock units were granted to key employees under existing plans 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 | 73,762 |  | $54.45
Performance restricted stock units | 84,277 |  | 56.97
Restricted stock units | 76,876 |  | 56.86
As of June 30, 2022, 261,301 shares were included in the calculation of diluted EPS related to the nonvested equity awards.

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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