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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table |
|  |  |  |  | Value of initial fixed $100 investment based on: |  |
Year | Summary Compensation Table Total for PEO(1) | Compensation Actually Paid to PEO(3) | Average Summary Compensation Table Total for non-PEO Named Executive Officers(2) | Average Compensation Actually Paid to non-PEO Named Executive Officers(3) | Alliant Total Shareholder Return(4) | Peer Group Total Shareholder Return(4) | Alliant Net Income (5) (Millions) | Alliant Adjusted EPS (6)
2024 | $6,971,735 | $8,538,292 | $3,218,133 | $3,749,025 | $126.64 | $127.32 | $690 | $3.04
2023 | $9,709,782 | $7,235,148 | $2,593,105 | $2,483,122 | $106.09 | $106.90 | $703 | $2.82
2022 | $7,286,977 | $5,361,068 | $1,558,260 | $1,132,675 | $110.24 | $117.09 | $686 | $2.80
2021 | $10,449,260 | $10,185,275 | $1,630,049 | $2,208,076 | $119.13 | $115.76 | $674 | $2.65
2020 | $11,020,134 | $5,985,432 | $1,639,294 | $1,643,446 | $97.08 | $98.84 | $624 | $2.44
Company Selected Measure Name | Adjusted EPS |  |  |  |
Named Executive Officers, Footnote | Reflects Summary Compensation Table Total compensation for Ms. Barton, our PEO for 2024 as reported in this Proxy Statement, and for Mr. Larsen, our PEO as his compensation is reported in the 2024, 2023, 2022, and 2021 Proxy Statements.Reflects Summary Compensation Table Total compensation for the following non-PEO Named Executive Officers (NEOs) reported in the Proxy Statements for each year listed below.
Name | 2024 | 2023 | 2022 | 2021 | 2020
Lisa M. Barton | N/A | X | N/A | N/A | N/A
John O. Larsen | X | N/A | N/A | N/A | N/A
Robert J. Durian | X | X | X | X | X
Raja Sundararajan | X | X | N/A | N/A | N/A
David A. de Leon | X | X | X | X | X
Terry L. Kouba | N/A | X | X | X | X
James H. Gallegos | N/A | N/A | X | X | X
Michael S. Luhrs | N/A | N/A | X | N/A | N/A
Peer Group Issuers, Footnote | Reflects the Company’s TSR and Peer Group TSR based on the EEI Stock Index for the listed year. The EEI Stock Index is used to evaluate the Company’s TSR against peers as disclosed in the Compensation Discussion and Analysis and is also set forth in the stock performance graph included in the Company’s annual report for the year ended December 31, 2024. The amounts reported assume $100 was invested, as applicable, in each of the Company and the EEI Stock Index for the period starting December 31, 2019 through the end of the listed year. |  |  |  |
PEO Total Compensation Amount | $ 6,971,735 | $ 9,709,782 | $ 7,286,977 | $ 10,449,260 | $ 11,020,134
PEO Actually Paid Compensation Amount | $ 8,538,292 | 7,235,148 | 5,361,068 | 10,185,275 | 5,985,432
Adjustment To PEO Compensation, Footnote | The following adjustments were made to Total compensation reported in the Summary Compensation Table (SCT) for 2024 below to arrive at compensation actually paid to the PEO and the non-PEO NEOs, computed in accordance SEC rules. Amounts below are based on average amounts for the non-PEO NEOs in 2024.
|  |  | 2024
|  |  | PEO ($) | Average non-PEO NEOs ($)
SCT Total | $6,971,735 |  | $3,218,133 |
Less SCT Grant Date Fair Value of Equity Awards | ($4,437,940) |  | ($1,705,472) |
Less SCT Change in Pension Value | ($24) |  | ($67,010) |
Plus Pension Plan Service Cost During Applicable Year | $— |  | $10,971 |
+/- Change in Fair Value as of Year-End for Equity Awards Granted in Prior Fiscal Years that Remain Outstanding and Unvested at Year-End | $404,616 |  | $461,324 |
- Fair Value as of Prior Year-End for Equity Awards Granted in Any Prior Year that Failed to Vest During Applicable Year | $— |  | ($214,495) |
+/- Change in Fair Value as of Vest Date for Equity Awards Granted in Any Prior Year That Vest During Applicable Year (Compared to Fair Value as of Prior Year-End) | $— |  | ($105,393) |
+ Fair Value as of Year-End for Equity Awards Granted and that Remain Outstanding and Unvested at Year-End | $5,599,905 |  | $2,150,967 |
Compensation Actually Paid | $8,538,292 |  | $3,749,025 |
Non-PEO NEO Average Total Compensation Amount | $ 3,218,133 | 2,593,105 | 1,558,260 | 1,630,049 | 1,639,294
Non-PEO NEO Average Compensation Actually Paid Amount | $ 3,749,025 | 2,483,122 | 1,132,675 | 2,208,076 | 1,643,446
Adjustment to Non-PEO NEO Compensation Footnote | The following adjustments were made to Total compensation reported in the Summary Compensation Table (SCT) for 2024 below to arrive at compensation actually paid to the PEO and the non-PEO NEOs, computed in accordance SEC rules. Amounts below are based on average amounts for the non-PEO NEOs in 2024.
|  |  | 2024
|  |  | PEO ($) | Average non-PEO NEOs ($)
SCT Total | $6,971,735 |  | $3,218,133 |
Less SCT Grant Date Fair Value of Equity Awards | ($4,437,940) |  | ($1,705,472) |
Less SCT Change in Pension Value | ($24) |  | ($67,010) |
Plus Pension Plan Service Cost During Applicable Year | $— |  | $10,971 |
+/- Change in Fair Value as of Year-End for Equity Awards Granted in Prior Fiscal Years that Remain Outstanding and Unvested at Year-End | $404,616 |  | $461,324 |
- Fair Value as of Prior Year-End for Equity Awards Granted in Any Prior Year that Failed to Vest During Applicable Year | $— |  | ($214,495) |
+/- Change in Fair Value as of Vest Date for Equity Awards Granted in Any Prior Year That Vest During Applicable Year (Compared to Fair Value as of Prior Year-End) | $— |  | ($105,393) |
+ Fair Value as of Year-End for Equity Awards Granted and that Remain Outstanding and Unvested at Year-End | $5,599,905 |  | $2,150,967 |
Compensation Actually Paid | $8,538,292 |  | $3,749,025 |
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |  |
Compensation Actually Paid vs. Net Income |  |  |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |  |
Tabular List, Table | The most important financial performance metrics used by the Compensation and Personnel Committee for linking compensation actually paid to our PEO and our other NEOs to Company performance for 2024 are set forth below.
Financial Metric
Total Shareholder Return (TSR)
Net Income
Earnings Per Share (EPS)
Total Shareholder Return Amount | $ 126.64 | 106.09 | 110.24 | 119.13 | 97.08
Peer Group Total Shareholder Return Amount | 127.32 | 106.90 | 117.09 | 115.76 | 98.84
Net Income (Loss) | $ 690,000,000 | $ 703,000,000 | $ 686,000,000 | $ 674,000,000 | $ 624,000,000
Company Selected Measure Amount | 3.04 | 2.82 | 2.80 | 2.65 | 2.44
PEO Name | Ms. Barton | Mr. Larsen | Mr. Larsen | Mr. Larsen | Mr. Larsen
Additional 402(v) Disclosure | We believe our compensation philosophy and approach creates a strong link between executive compensation and Company performance. As described more fully in our Compensation Discussion and Analysis, our executive compensation program is guided by our purpose and values and is designed to promote our strategy. In accordance with SEC rules, the table below shows (i) the compensation reported in the Summary Compensation Table and the Compensation Actually Paid (calculated in accordance with SEC rules) for the Principal Executive Officer (PEO) for each year below and (ii) the average compensation reported in the Summary Compensation Table for the non-PEO named executive officers and the average Compensation Actually Paid (calculated in accordance with SEC rules) for the non-PEO named executive officers for each year below. It also includes the total shareholder return (TSR) for Alliant Energy and our defined peer group, our net income and adjusted EPS for each year.The Company’s Net Income as reported in its GAAP audited financial statements for the listed year.The Company’s Adjusted EPS as reported for the listed year in its proxy statements. Adjustments to GAAP EPS for 2022, 2023 and 2024 are shown on page 24 in the Compensation Discussion and Analysis. Adjusted EPS in 2021 excludes a loss of $0.02 per share for the non-cash charge related to the redemption of IPL preferred stock. Adjusted EPS in 2020 excludes a gain of $0.02 per share related to credit loss adjustments on a guarantee for an affiliate of Whiting Petroleum Corporation, a gain of $0.02 per share related to a tax valuation allowance adjustment, and a loss of $0.01 per share resulting from a settlement loss for the IPL retirement plan.Our compensation programs are designed to link executive pay to the financial performance of the Company. As shown below, our executive compensation has a strong link to TSR, EPS and Net Income performance. This strong link is created by our long-term incentive compensation being heavily weighted to TSR, EPS and Net Income and our annual incentive compensation being heavily weighted to EPS. Our incentive compensation plan design is discussed further in the Compensation Discussion and Analysis. The following graphs further illustrate the relationship between the pay and performance figures that are included in the pay versus performance tabular disclosure above. |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Total Shareholder Return (TSR) |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Net Income |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Earnings Per Share (EPS) |  |  |  |
PEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (24) |  |  |  |
PEO | Aggregate Pension Adjustments Service Cost |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 |  |  |  |
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (4,437,940) |  |  |  |
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 5,599,905 |  |  |  |
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 404,616 |  |  |  |
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 |  |  |  |
PEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 0 |  |  |  |
Non-PEO NEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (67,010) |  |  |  |
Non-PEO NEO | Aggregate Pension Adjustments Service Cost |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 10,971 |  |  |  |
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (1,705,472) |  |  |  |
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 2,150,967 |  |  |  |
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 461,324 |  |  |  |
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (105,393) |  |  |  |
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (214,495) |  |  |  |

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