Exhibit 99.1 Alliant Energy Corporation Corporate Headquarters 4902 North Biltmore Lane Madison, WI 53718-2148 www.alliantenergy.com News Release FOR IMMEDIATE RELEASE Media Hotline: (608) 458-4040 Investor Relations: Susan Gille (608) 458-3956 ALLIANT ENERGY ANNOUNCES 2024 RESULTS MADISON, Wis. - February 20, 2025 - Alliant Energy Corporation (NASDAQ: LNT) today announced U.S. generally accepted accounting principles (GAAP) and non-GAAP consolidated unaudited earnings per share (EPS) for 2024 and 2023 as f ...

Alliant Energy (LNT) is scheduled to release fourth-quarter 2024 results on Feb. 20, after market close. The company delivered a negative earnings surprise of 19.7% in the last reported quarter.See the Zacks Earnings Calendar to stay ahead of market-making news.Let’s discuss the factors that are likely to be reflected in the upcoming quarterly results.Key Factors That Might Have Impacted LNT's Q4 PerformanceIn September 2024, the IUC issued an order authorizing annual base rate increases of $185 million for ...

Alliant Energy Corporation (NASDAQ:LNT) Q3 2024 Earnings Conference Call November 1, 2024 10:00 AM ET Company Participants Susan Gille - IR Lisa Barton - President and CEO Robert Durian - EVP and CFO Conference Call Participants Nathan Richardson - Barclays Julian Dumoulin-Smith - Jefferies Andrew Weisel - Scotiabank Paul Fremont - Ladenburg Aditya Gandhi - Wolf Research Bill Appicelli - UBS Operator Please stand by, we're about to begin. Thank you for holding, everyone, and welcome to Alliant Energy's Thir ...

Financial Data and Key Metrics Changes - The company reported Q3 earnings of $1.15 per share, an increase from non-GAAP earnings of $1.05 per share in Q3 2023, primarily due to higher revenue requirements from capital investments and timing of income tax expense [22][23] - The 2024 earnings guidance has been narrowed to a range of $2.99 to $3.06 per share, reflecting solid earnings through September and successful offsetting of temperature impacts [26][28] Business Line Data and Key Metrics Changes - Higher sales to residential and commercial customers were noted, partially offset by lower sales to low-margin industrial customers due to reduced maintenance [25] - The company anticipates a 20% increase in peak demand over the next five years from new data center loads, with the first phase expected to add 1.1 gigawatts by the end of 2028 [10][11] Market Data and Key Metrics Changes - The company is experiencing a collaborative regulatory environment in both Iowa and Wisconsin, which supports growth and enhances reliability [17] - The recently approved individual customer rates in Iowa are expected to stabilize base rates through the end of the decade, providing predictability for customers [12] Company Strategy and Development Direction - The company is focused on economic development, leveraging a dynamic resource planning model to adapt to evolving customer needs [8][9] - A refreshed Clean Energy Blueprint is being implemented to align energy resources with growing demand, incorporating investments in renewable generation and energy storage [14][18] Management's Comments on Operating Environment and Future Outlook - Management expressed confidence in achieving long-term earnings growth targets of 5% to 7%, despite challenges from milder temperatures impacting earnings [6][28] - The company is committed to maintaining affordability while advancing its clean energy transition, with over 40% of the capital expenditure plan dedicated to renewable investments [18][32] Other Important Information - The company has increased its four-year capital expenditure plan by approximately $1.8 billion, projecting a compounded annual growth rate of 10% for rate base plus construction work in progress [35] - A $50 million grant from the U.S. Department of Energy has been secured to enhance electric grid reliability in rural Wisconsin [34] Q&A Session Summary Question: Impact of load growth on long-term EPS guidance - Management indicated that high case load growth would extend the 5% to 7% growth opportunities, with Phase 2 growth anticipated in later years [49] Question: Equity contributions and future financing - The company plans to need approximately $1 billion of new common equity through 2028, with higher levels of growth expected in the latter half of the capital expenditure plan [50][51] Question: Clarification on Phase 2 contributions - Management stated that visibility on load growth will improve as contracts are finalized, with updates to be provided as more information becomes available [55] Question: Weather impact on 2024 guidance - The company acknowledged that temperature impacts have been significant, with efforts to offset about 75% of these impacts contributing to the updated guidance [61][62] Question: Long-term EPS growth base - The revised 2024 guidance midpoint will serve as the base for long-term growth, with a commitment to a solid 6% growth rate despite a lower starting point [78][79] Question: Tax credits and financing plan insights - The company targets approximately $1.6 to $1.7 billion in tax credit monetization over the next four years, which will support financing for capital expenditures [80][81] Question: Future load growth revisions - Management indicated that revisions may occur in the first half of next year as new data center loads are aligned [83]

Part I. Financial Information [Item 1. Condensed Consolidated Financial Statements (Unaudited)](index=6&type=section&id=Item%201.%20Condensed%20Consolidated%20Financial%20Statements%20(Unaudited)) This section presents the unaudited Q3 2024 condensed consolidated financial statements for Alliant Energy and its subsidiaries [Alliant Energy Corporation Financial Statements](index=6&type=section&id=Alliant%20Energy%20Corporation) Alliant Energy Q3 & YTD 2024 Financial Performance (in millions, except EPS) | Metric | Q3 2024 | Q3 2023 | YTD 2024 | YTD 2023 | | :--- | :--- | :--- | :--- | :--- | | **Total Revenues** | $1,081 | $1,077 | $3,005 | $3,066 | | **Operating Income** | $313 | $322 | $665 | $760 | | **Net Income** | $295 | $259 | $540 | $582 | | **Diluted EPS** | $1.15 | $1.02 | $2.10 | $2.31 | Alliant Energy Balance Sheet Summary (in millions) | Account | Sep 30, 2024 | Dec 31, 2023 | | :--- | :--- | :--- | | **Total Assets** | $22,829 | $21,237 | | Property, Plant & Equipment, net | $17,936 | $17,157 | | **Total Liabilities** | $15,861 | $14,460 | | Long-term Debt, net | $9,245 | $8,225 | | **Total Equity** | $6,968 | $6,777 | Alliant Energy YTD 2024 Cash Flow Summary (in millions) | Cash Flow Category | YTD 2024 | YTD 2023 | | :--- | :--- | :--- | | **Net Cash from Operating Activities** | $913 | $622 | | **Net Cash used for Investing Activities** | ($940) | ($952) | | **Net Cash from Financing Activities** | $794 | $515 | | **Net Increase in Cash** | $767 | $185 | [Interstate Power and Light Company (IPL) Financial Statements](index=9&type=section&id=Interstate%20Power%20and%20Light%20Company) IPL Q3 & YTD 2024 Financial Performance (in millions) | Metric | Q3 2024 | Q3 2023 | YTD 2024 | YTD 2023 | | :--- | :--- | :--- | :--- | :--- | | **Total Revenues** | $561 | $594 | $1,527 | $1,630 | | **Operating Income** | $149 | $173 | $250 | $379 | | **Net Income** | $190 | $170 | $272 | $331 | - IPL's YTD operating income decreased significantly, partly due to a **$60 million asset valuation charge** for the Lansing Generating Station[16](index=16&type=chunk) IPL YTD 2024 Cash Flow Summary (in millions) | Cash Flow Category | YTD 2024 | YTD 2023 | | :--- | :--- | :--- | | **Net Cash from Operating Activities** | $231 | $191 | | **Net Cash used for Investing Activities** | ($332) | ($177) | | **Net Cash from Financing Activities** | $804 | $159 | | **Net Increase in Cash** | $703 | $173 | [Wisconsin Power and Light Company (WPL) Financial Statements](index=12&type=section&id=Wisconsin%20Power%20and%20Light%20Company) WPL Q3 & YTD 2024 Financial Performance (in millions) | Metric | Q3 2024 | Q3 2023 | YTD 2024 | YTD 2023 | | :--- | :--- | :--- | :--- | :--- | | **Total Revenues** | $499 | $461 | $1,410 | $1,370 | | **Operating Income** | $156 | $142 | $387 | $363 | | **Net Income** | $114 | $107 | $270 | $267 | WPL YTD 2024 Cash Flow Summary (in millions) | Cash Flow Category | YTD 2024 | YTD 2023 | | :--- | :--- | :--- | | **Net Cash from Operating Activities** | $651 | $437 | | **Net Cash used for Investing Activities** | ($464) | ($680) | | **Net Cash from (used for) Financing Activities** | ($125) | $254 | | **Net Increase in Cash** | $62 | $11 | [Combined Notes to Condensed Consolidated Financial Statements](index=15&type=section&id=Combined%20Notes%20to%20Condensed%20Consolidated%20Financial%20Statements) - In September 2024, the IUC approved IPL's retail electric rate review, authorizing a **$185 million annual base rate increase** effective October 1, 2024[40](index=40&type=chunk) - A pre-tax non-cash charge of **$60 million** was recorded for IPL's Lansing Generating Station as a settlement agreement disallowed a return on the retired asset[37](index=37&type=chunk) - WPL expects construction costs for its 1,100 MW of new solar generation to exceed approved estimates by approximately **$195 million**[41](index=41&type=chunk) - Due to the enactment of the revised CCR Rule, the company recorded significant additional Asset Retirement Obligations, increasing the balance from **$246 million to $608 million** for Alliant Energy[68](index=68&type=chunk) [Management's Discussion and Analysis of Financial Condition and Results of Operations (MD&A)](index=31&type=section&id=Item%202.%20Management's%20Discussion%20and%20Analysis%20of%20Financial%20Condition%20and%20Results%20of%20Operations) Management analyzes 2024 financial performance, operational highlights, liquidity, and capital resource allocation - Alliant Energy's consolidated EPS for Q3 2024 was **$1.15**, up from **$1.02** in Q3 2023, driven by WPL's capital investments and favorable tax timing[112](index=112&type=chunk) - Key 2024 activities include completing solar facilities, planning a coal-to-gas plant conversion, and securing a **$185 million rate increase** for IPL[103](index=103&type=chunk)[104](index=104&type=chunk) - The company is pursuing significant customer growth, having entered into electric service agreements with **two new data center customers** in Iowa[106](index=106&type=chunk) - In Q4 2024, Alliant Energy expects to record pre-tax restructuring charges of **$25 million to $30 million** related to a voluntary separation package[127](index=127&type=chunk) [Results of Operations](index=34&type=section&id=Results%20of%20Operations) Change in Net Income (YTD 2024 vs YTD 2023, in millions) | Entity | Change in Net Income | | :--- | :--- | | **Alliant Energy** | ($42) | | **IPL** | ($59) | | **WPL** | $3 | - IPL's YTD net income decreased by **$59 million**, driven by a **$60 million asset valuation charge** for the Lansing Generating Station[116](index=116&type=chunk) - WPL's electric utility revenues increased by **$69 million YTD**, primarily due to higher revenue requirements from capital investments[116](index=116&type=chunk)[121](index=121&type=chunk) - Future results will be impacted by a growing rate base, a lower effective tax rate from renewable tax credits, and cost savings from restructuring[127](index=127&type=chunk) [Liquidity and Capital Resources](index=39&type=section&id=Liquidity%20and%20Capital%20Resources) - As of September 30, 2024, Alliant Energy had a strong liquidity position with **$827 million in cash** and **$670 million of available credit**[129](index=129&type=chunk) Projected Construction and Acquisition Expenditures (2024-2028, in millions) | Entity | 2024 | 2025 | 2026 | 2027 | 2028 | | :--- | :--- | :--- | :--- | :--- | :--- | | **Alliant Energy** | $2,025 | $2,205 | $2,680 | $3,020 | $2,960 | | **IPL** | $1,190 | $1,055 | $1,135 | $1,365 | $1,300 | | **WPL** | $690 | $955 | $1,370 | $1,530 | $1,490 | - Expenditures are focused on transitioning to cleaner energy, adding generation capacity, and strengthening grid resiliency[133](index=133&type=chunk) - In March 2024, Standard & Poor's changed Alliant Energy's and IPL's outlooks from **stable to negative**, though this is not expected to materially impact liquidity[137](index=137&type=chunk) [Quantitative and Qualitative Disclosures About Market Risk](index=43&type=section&id=Item%203.%20Quantitative%20and%20Qualitative%20Disclosures%20About%20Market%20Risk) The company reports no material changes to its market risk disclosures from the 2023 Form 10-K - The disclosures regarding market risk as reported in the 2023 Form 10-K have not materially changed[145](index=145&type=chunk) [Controls and Procedures](index=44&type=section&id=Item%204.%20Controls%20and%20Procedures) Management concluded that disclosure controls and internal controls over financial reporting were effective as of the quarter's end - Management concluded that the disclosure controls and procedures for Alliant Energy, IPL, and WPL were **effective** as of September 30, 2024[146](index=146&type=chunk) - There were **no material changes** in internal control over financial reporting during the quarter[147](index=147&type=chunk) Part II. Other Information [Legal Proceedings](index=44&type=section&id=Item%201.%20Legal%20Proceedings) The company reports no new material legal or environmental proceedings for the period - There are **no legal proceedings** to report for the period[148](index=148&type=chunk) [Risk Factors](index=44&type=section&id=Item%201A.%20Risk%20Factors) There have been no material changes to the risk factors previously disclosed in the 2023 Form 10-K - The risk factors described in the 2023 Form 10-K have **not changed materially**[149](index=149&type=chunk) [Unregistered Sales of Equity Securities and Use of Proceeds](index=44&type=section&id=Item%202.%20Unregistered%20Sales%20of%20Equity%20Securities%20and%20Use%20of%20Proceeds) The company details the repurchase of its common stock during the third quarter of 2024 Alliant Energy Common Stock Repurchases (Q3 2024) | Metric | Value | | :--- | :--- | | **Total Shares Purchased** | 10,300 | | **Average Price Paid Per Share** | $54.81 | - All repurchased shares were acquired on the open market and are held in a rabbi trust for the company's Deferred Compensation Plan[150](index=150&type=chunk) [Exhibits](index=45&type=section&id=Item%206.%20Exhibits) This section lists all exhibits filed with the Form 10-Q, including certifications and debt issuance documents - The exhibits include CEO and CFO certifications and documents related to IPL's September 2024 issuance of **Senior Debentures due 2034 and 2054**[153](index=153&type=chunk)

Alliant Energy (LNT) came out with quarterly earnings of $1.15 per share, beating the Zacks Consensus Estimate of $1.11 per share. This compares to earnings of $1.05 per share a year ago. These figures are adjusted for non-recurring items.This quarterly report represents an earnings surprise of 3.60%. A quarter ago, it was expected that this electric and gas utility parent company would post earnings of $0.71 per share when it actually produced earnings of $0.57, delivering a surprise of -19.72%.Over the la ...

Alliant Energy (LNT) is expected to deliver a year-over-year increase in earnings on higher revenues when it reports results for the quarter ended September 2024. This widely-known consensus outlook gives a good sense of the company's earnings picture, but how the actual results compare to these estimates is a powerful factor that could impact its near-term stock price.The earnings report, which is expected to be released on October 31, 2024, might help the stock move higher if these key numbers are better ...

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Core Viewpoint - Alliant Energy Corporation reported disappointing second-quarter 2024 results, with operating earnings and revenues falling short of expectations and declining year-over-year Financial Performance - Operating earnings for Q2 2024 were 57 cents per share, missing the Zacks Consensus Estimate of 71 cents by 19.7% and down 10.9% from 64 cents per share in the same quarter last year [1] - Revenues totaled $0.89 billion, missing the Zacks Consensus Estimate of $1.09 billion by 18.08% and decreased 1.9% from $0.91 billion in the year-ago quarter [2] Operational Highlights - Total operating expenses increased to $764 million, up 9.9% from $695 million in the prior year, driven by higher electric transmission service expenses and increased depreciation and amortization [3] - Operating income fell to $130 million, down 40% from the previous year's figure [3] - Interest expenses rose to $108 million, a 12.5% increase compared to the prior-year period [3] Customer and Sales Metrics - Retail electric customers increased by 0.8% and retail gas customers by 0.6% year-over-year [4] - Total utility electric sales were 7,702 thousand megawatt-hours (MWh), down 0.9% from the previous year [4] - Total utility gas sold and transported was 34,832 thousand dekatherms, up 8.6% year-over-year [4] Financial Update - Cash and cash equivalents stood at $92 million as of June 30, 2024, compared to $62 million as of December 31, 2023 [5] - Long-term debt (excluding the current portion) increased to $8.9 billion as of June 30, 2024, from $8.2 billion at the end of 2023 [5] - Cash flow from operating activities for the first half of 2024 was $562 million, compared to $311 million in the same period last year [5] 2024 Guidance - Alliant Energy reaffirmed its 2024 earnings guidance in the range of $2.99-$3.13 per share, considering average temperature, cost controls, and a consolidated effective tax rate of 10% [6] - The Zacks Consensus Estimate for earnings is $3.08 per share, which is higher than the midpoint of the company's guided range [6] Zacks Rank - Alliant Energy currently holds a Zacks Rank 2 (Buy) [7]

Alliant Energy (LNT) came out with quarterly earnings of $0.57 per share, missing the Zacks Consensus Estimate of $0.71 per share. This compares to earnings of $0.64 per share a year ago. These figures are adjusted for non-recurring items. This quarterly report represents an earnings surprise of -19.72%. A quarter ago, it was expected that this electric and gas utility parent company would post earnings of $0.66 per share when it actually produced earnings of $0.62, delivering a surprise of -6.06%. Over the ...