• Third quarter GAAP earnings per share was $1.02 in 2023, compared to $0.90 in 2022
• Provided 2024 earnings guidance range of $2.99 to $3.13 and 2024 common stock dividend target of $1.92
• Forecasted 2024 - 2027 capital expenditures of $9 billion in aggregate

Alliant Energy Corporation (NASDAQ: LNT) today announced U.S. generally accepted accounting principles (GAAP) and non-GAAP consolidated unaudited earnings per share (EPS) for the three months ended September 30 as follows:

“We continue to deliver solid financial and operational results while executing our customer-focused strategy,” said John Larsen, Alliant Energy Board Chair and CEO. “Our narrowed 2023 earnings guidance, introduction of our 2024 earnings guidance, and reiteration of our long-term earnings growth range of 5% to 7% reinforces the consistent performance and predicable long-term growth of our company.”

Utilities and Corporate Services - Alliant Energy’s Utilities and Alliant Energy Corporate Services, Inc. (Corporate Services) operations generated $1.11 per share of GAAP EPS in the third quarter of 2023, which was $0.12 per share higher than the third quarter of 2022. The primary drivers of higher EPS were higher revenue requirements and allowance for funds used during construction (AFUDC) from Wisconsin Power and Light Company’s (WPL’s) capital investments, and lower other operation and maintenance expenses. These items were partially offset by higher interest expense.

Non-utility and Parent - Alliant Energy’s Non-utility and Parent operations generated $(0.12) per share of GAAP EPS in the third quarter of 2023, which was a $0.01 per share earnings decrease compared to the third quarter of 2022. The lower EPS was primarily driven by higher interest expense.

Earnings Adjustments - Non-GAAP EPS for the three months ended September 30, 2023 and 2022 excludes $0.03 per share and $0.03 per share, respectively, of charges related to the Iowa state income tax rate change for Alliant Energy’s Non-utility and Parent. Non-GAAP adjustments, which relate to material charges or income that are not normally associated with ongoing operations, are provided as a supplement to results reported in accordance with GAAP.

Estimated Temperature Impacts to Non-GAAP EPS - The estimated year-to-date impact of temperatures on EPS compared to normal temperatures is a $0.02 per share loss in 2023. The midpoint of the temperature normalized non-GAAP EPS guidance for the full year 2023 is $2.89.

Details regarding GAAP EPS variances between the third quarters of 2023 and 2022 for Alliant Energy are as follows:

Revenue requirements and higher AFUDC from WPL capital investments - In December 2021, WPL received an order from the Public Service Commission of Wisconsin (PSCW) approving WPL’s proposed settlement for its retail electric and gas rate review covering the 2022/2023 Test Period. In December 2022, WPL received an order from the PSCW approving an additional annual base rate increase of $9 million for WPL’s retail gas customers covering the 2023 Test Period. WPL recognized a $0.04 per share increase in the third quarter of 2023 due to higher revenue requirements from increasing rate base, including investments in solar generation. The construction activity related to these investments also resulted in $0.04 per share higher AFUDC in the third quarter of 2023.

Iowa state income tax rate changes - Pursuant to Iowa tax reform enacted in 2022, in September 2023, the Iowa Department of Revenue announced an Iowa corporate income tax rate of 7.1%, effective January 1, 2024. The announced changes in the corporate income tax rate resulted in a non-GAAP charge of $8 million or $0.03 per share in the third quarter of 2023, compared to a non-GAAP charge of $8 million or $0.03 per share recorded in the third quarter of 2022 related to the Iowa corporate income tax rate change effective January 1, 2023. These charges were recorded to income tax expense related to the remeasurement of deferred income tax assets at the Non-utility and Parent operations. The lower tax rate also resulted in reductions in regulatory assets recorded in the third quarter of 2023 and 2022 related to the remeasurement of deferred income tax liabilities at IPL, which is expected to provide cost benefits to its Iowa customers in the future.

2023 Earnings Guidance

Alliant Energy is narrowing its EPS guidance as follows.

Drivers for Alliant Energy’s 2023 EPS guidance include, but are not limited to:

• Ability of IPL and WPL to earn their authorized rates of return
• Stable economy and resulting implications on utility sales
• Normal temperatures in its utility service territories
• Execution of cost controls
• Execution of capital expenditure and financing plans
• Consolidated effective tax rate of 2%

The 2023 earnings guidance does not include the impacts of any material non-cash valuation adjustments, regulatory-related charges or credits, reorganizations or restructurings, future changes in laws including corporate tax reform in Iowa, regulations or regulatory policies, adjustments made to deferred tax assets and liabilities from valuation allowances, changes in credit loss liabilities related to guarantees, pending lawsuits and disputes, settlement charges related to pension and other postretirement benefit plans, federal and state income tax audits and other Internal Revenue Service proceedings, impacts from changes to the authorized return on equity for the American Transmission Company, or changes in GAAP and tax methods of accounting that may impact the reported results of Alliant Energy.

2024 Earnings Guidance

Alliant Energy is issuing EPS guidance for 2024 of $2.99 - $3.13. Drivers for Alliant Energy’s 2024 EPS guidance include, but are not limited to:

• Ability of IPL and WPL to earn their authorized rates of return
• Normal temperatures in its utility service territories
• Constructive regulatory outcomes from regulatory proceedings
• Stable economy and resulting implications on utility sales
• Execution of capital expenditure and financing plans
• Execution of cost controls
• Consolidated effective tax rate of (8%)

The 2024 earnings guidance does not include the impacts of any material non-cash valuation adjustments, regulatory-related charges or credits, reorganizations or restructurings, future changes in laws including corporate tax reform in Iowa, regulations or regulatory policies, adjustments made to deferred tax assets and liabilities from valuation allowances, changes in credit loss liabilities related to guarantees, pending lawsuits and disputes, settlement charges related to pension and other postretirement benefit plans, federal and state income tax audits and other Internal Revenue Service proceedings, impacts from changes to the authorized return on equity for the American Transmission Company, or changes in GAAP and tax methods of accounting that may impact the reported results of Alliant Energy.

“As we complete our historic solar expansion in 2024, our customers and communities will experience the benefits of additional low cost, cleaner energy. Our consistent track record of 5% to 7% long-term growth continues with our 2024 earnings guidance of $2.99 - $3.13 per share,” said Larsen.

2024 Annual Common Stock Dividend Target

Alliant Energy has increased its 2024 expected annual common stock dividend target to $1.92 per share from the current annual common stock dividend target of $1.81 per share, a 6% increase. Payment of the 2024 quarterly dividend is subject to the actual dividend declaration by the Board of Directors each quarter, which is expected in January 2024 for the first quarter dividend.

Projected Capital Expenditures

Alliant Energy has updated its projected capital expenditures for 2023 through 2027 (in millions). The projected capital expenditures exclude AFUDC and capitalized interest, if applicable. Cost estimates represent Alliant Energy’s estimated portion of total construction expenditures.

Earnings Conference Call

A conference call to review the third quarter 2023 results is scheduled for Friday, November 3, 2023 at 9 a.m. central time. Alliant Energy Board Chair and Chief Executive Officer John Larsen, President and Chief Operating Officer Lisa Barton, and Executive Vice President and Chief Financial Officer Robert Durian will host the call. The conference call is open to the public and can be accessed in two ways. Interested parties may listen to the call by dialing 888-259-6580 (Toll-Free - North America) or 416-764-8624 (Local), passcode 99382583. Interested parties may also listen to a webcast at www.alliantenergy.com/investors. In conjunction with the information in this earnings announcement and the conference call, Alliant Energy posted supplemental materials on its website. An archive of the webcast will be available on the Company’s website at www.alliantenergy.com/investors for 12 months.

About Alliant Energy Corporation

Alliant Energy is the parent company of two public utility companies - Interstate Power and Light Company and Wisconsin Power and Light Company - and of Alliant Energy Finance, LLC, the parent company of Alliant Energy’s non-utility operations. Alliant Energy, whose core purpose is to serve customers and build stronger communities, is an energy-services provider with utility subsidiaries serving approximately 995,000 electric and 425,000 natural gas customers. Providing its customers in the Midwest with regulated electricity and natural gas service is the Company’s primary focus. Alliant Energy, headquartered in Madison, Wisconsin, is a component of the S&P 500 and is traded on the Nasdaq Global Select Market under the symbol LNT. For more information, visit the Company’s website at www.alliantenergy.com.

Forward-Looking Statements

This press release includes forward-looking statements. These forward-looking statements can be identified by words such as “forecast,” “expect,” “guidance,” or other words of similar import. Similarly, statements that describe future financial performance or plans or strategies are forward-looking statements. Such forward looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those expressed in, or implied by, such statements. Actual results could be materially affected by the following factors, among others:

• the direct or indirect effects resulting from cybersecurity incidents or attacks on Alliant Energy, IPL, WPL, or their suppliers, contractors and partners, or responses to such incidents or attacks;
• the impact of customer- and third party-owned generation, including alternative electric suppliers, in IPL’s and WPL’s service territories on system reliability, operating expenses and customers’ demand for electricity;
• the impact of energy efficiency, franchise retention and customer disconnects on sales volumes and margins;
• the impact that price changes may have on IPL’s and WPL’s customers’ demand for electric, gas and steam services and their ability to pay their bills;
• inflation and higher interest rates;
• changes in the price of delivered natural gas, transmission, purchased electricity and delivered coal, particularly during elevated market prices, and any resulting changes to counterparty credit risk, due to shifts in supply and demand caused by market conditions, regulations and Midcontinent Independent System Operator, Inc.’s (MISO’s) seasonal resource adequacy process;
• IPL’s and WPL’s ability to obtain adequate and timely rate relief to allow for, among other things, the recovery of and/or the return on costs, including fuel costs, operating costs, transmission costs, capacity costs, deferred expenditures, deferred tax assets, tax expense, interest expense, capital expenditures, and remaining costs related to electric generating units (EGUs) that may be permanently closed and certain other retired assets, decreases in sales volumes, earning their authorized rates of return, and the payments to their parent of expected levels of dividends;
• the ability to obtain regulatory approval for construction projects with acceptable conditions;
• the ability to complete construction of renewable generation and storage projects by planned in-service dates and within the cost targets set by regulators due to cost increases of and access to materials, equipment and commodities, which could result from tariffs, duties or other assessments, such as any additional tariffs resulting from U.S. Department of Commerce investigations into and any decisions made regarding the sourcing of solar project materials and equipment from certain countries, labor issues or supply shortages, the ability to successfully resolve warranty issues or contract disputes, the ability to achieve the expected level of tax benefits based on tax guidelines, project costs and the level of electricity output generated by qualifying generating facilities, and the ability to efficiently utilize the renewable generation and storage project tax benefits for the benefit of customers;
• the ability to utilize tax credits generated to date, and those that may be generated in the future, before they expire, as well as the ability to transfer tax credits that may be generated in the future at adequate pricing;
• disruptions to ongoing operations and the supply of materials, services, equipment and commodities needed to construct solar generation, battery storage and electric and gas distribution projects, which may result from geopolitical issues, supplier manufacturing constraints, labor issues or transportation issues, and thus affect the ability to meet capacity requirements and result in increased capacity expense;
• the future development of technologies related to electrification, and the ability to reliably store and manage electricity;
• federal and state regulatory or governmental actions, including the impact of legislation, and regulatory agency orders;
• the impacts of changes in the tax code, including tax rates, minimum tax rates, adjustments made to deferred tax assets and liabilities, and changes impacting the availability of renewable tax credits;
• employee workforce factors, including the ability to hire and retain employees with specialized skills, impacts from employee retirements, changes in key executives, ability to create desired corporate culture, collective bargaining agreements and negotiations, work stoppages or restructurings;
• disruptions in the supply and delivery of natural gas, purchased electricity and coal;
• changes to the creditworthiness of, or performance of obligations by, counterparties with which Alliant Energy, IPL and WPL have contractual arrangements, including participants in the energy markets and fuel suppliers and transporters;
• the impact of penalties or third-party claims related to, or in connection with, a failure to maintain the security of personally identifiable information, including associated costs to notify affected persons and to mitigate their information security concerns;
• impacts that terrorist attacks may have on Alliant Energy’s, IPL’s and WPL’s operations and recovery of costs associated with restoration activities, or on the operations of Alliant Energy’s investments;
• any material post-closing payments related to any past asset divestitures, including the sale of Whiting Petroleum, which could result from, among other things, indemnification agreements, warranties, guarantees or litigation;
• weather effects on results of utility operations;
• continued access to the capital markets on competitive terms and rates, and the actions of credit rating agencies;
• changes to MISO’s resource adequacy process establishing capacity planning reserve margin and capacity accreditation requirements that may impact how and when new and existing generating facilities, including IPL’s and WPL’s additional solar generation, may be accredited with energy capacity, and may require IPL and WPL to adjust their current resource plans, to add resources to meet the requirements of MISO’s process, or procure capacity in the market whereby such costs might not be recovered in rates;
• issues associated with environmental remediation and environmental compliance, including compliance with all environmental and emissions permits and future changes in environmental laws and regulations, including changes to the Coal Combustion Residuals Rule, Cross-State Air Pollution Rule and federal, state or local regulations for greenhouse gases emissions reductions from new and existing fossil-fueled EGUs under the Clean Air Act, and litigation associated with environmental requirements;
• increased pressure from customers, investors and other stakeholders to more rapidly reduce greenhouse gases emissions;
• the ability to defend against environmental claims brought by state and federal agencies, such as the U.S. Environmental Protection Agency and state natural resources agencies, or third parties, such as the Sierra Club, and the impact on operating expenses of defending and resolving such claims;
• the direct or indirect effects resulting from breakdown or failure of equipment in the operation of electric and gas distribution systems, such as mechanical problems and explosions or fires, and compliance with electric and gas transmission and distribution safety regulations, including regulations promulgated by the Pipeline and Hazardous Materials Safety Administration;
• issues related to the availability and operations of EGUs, including start-up risks, breakdown or failure of equipment, availability of warranty coverage and successful resolution of warranty issues or contract disputes for equipment breakdowns or failures, performance below expected or contracted levels of output or efficiency, operator error, employee safety, transmission constraints, compliance with mandatory reliability standards and risks related to recovery of resulting incremental operating, fuel-related and capital costs through rates;
• impacts that excessive heat, excessive cold, storms, wildfires, or natural disasters may have on Alliant Energy’s, IPL’s and WPL’s operations and construction activities, and recovery of costs associated with restoration activities, or on the operations of Alliant Energy’s investments;
• the direct or indirect effects resulting from the ongoing novel coronavirus (COVID-19) pandemic and the spread of variant strains;
• Alliant Energy’s ability to sustain its dividend payout ratio goal;
• changes to costs of providing benefits and related funding requirements of pension and other postretirement benefits plans due to the market value of the assets that fund the plans, economic conditions, financial market performance, interest rates, timing and form of benefits payments, life expectancies and demographics;
• material changes in employee-related benefit and compensation costs, including settlement losses related to pension plans;
• risks associated with operation and ownership of non-utility holdings;
• changes in technology that alter the channels through which customers buy or utilize Alliant Energy’s, IPL’s or WPL’s products and services;
• impacts on equity income from unconsolidated investments from changes in valuations of the assets held, as well as potential changes to ATC LLC’s authorized return on equity;
• impacts of IPL’s future tax benefits from Iowa rate-making practices, including deductions for repairs expenditures, allocation of mixed service costs and state depreciation, and recoverability of the associated regulatory assets from customers, when the differences reverse in future periods;
• current or future litigation, regulatory investigations, proceedings or inquiries;
• reputational damage from negative publicity, protests, fines, penalties and other negative consequences resulting in regulatory and/or legal actions;
• the effect of accounting standards issued periodically by standard-setting bodies;
• the ability to successfully complete tax audits and changes in tax accounting methods with no material impact on earnings and cash flows; and
• other factors listed in the “2023 Earnings Guidance” and “2024 Earnings Guidance” sections of this press release.

For more information about potential factors that could affect Alliant Energy’s business and financial results, refer to Alliant Energy’s most recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (“SEC”), including the sections therein titled “Risk Factors,” and its other filings with the SEC.

Without limitation, the expectations with respect to 2023 and 2024 earnings guidance, 2024 annual common stock dividend target, and 2023-2027 capital expenditures guidance in this press release are forward-looking statements and are based in part on certain assumptions made by Alliant Energy, some of which are referred to in the forward-looking statements. Alliant Energy cannot provide any assurance that the assumptions referred to in the forward-looking statements or otherwise are accurate or will prove to be correct. Any assumptions that are inaccurate or do not prove to be correct could have a material adverse effect on Alliant Energy’s ability to achieve the estimates or other targets included in the forward-looking statements. The forward-looking statements included herein are made as of the date hereof and, except as required by law, Alliant Energy undertakes no obligation to update publicly such statements to reflect subsequent events or circumstances.

Use of Non-GAAP Financial Measures

To provide investors with additional information regarding Alliant Energy’s financial results, this press release includes reference to certain non-GAAP financial measures. These measures include income and EPS for the three and nine months ended September 30, 2023 and 2022 excluding charges related to the Iowa state income tax rate changes. Alliant Energy believes this non-GAAP financial measure is useful to investors because it provides an alternate measure to better understand and compare across periods the operating performance of Alliant Energy without the distortion of items that management believes are not normally associated with ongoing operations, and also provides additional information about Alliant Energy’s operations on a basis consistent with the measures that management uses to manage its operations and evaluate its performance. Alliant Energy’s management also uses income, as adjusted, to determine performance-based compensation.

In addition, Alliant Energy included in this press release IPL; WPL; Corporate Services; Utilities and Corporate Services; ATC Holdings; and Non-utility and Parent EPS for the three and nine months ended September 30, 2023 and 2022. Alliant Energy believes these non-GAAP financial measures are useful to investors because they facilitate an understanding of segment performance and trends, and provide additional information about Alliant Energy’s operations on a basis consistent with the measures that management uses to manage its operations and evaluate its performance.

This press release references year-over-year variances in utility electric margins and utility gas margins. Utility electric margins and utility gas margins are non-GAAP financial measures that will be reported and reconciled to the most directly comparable GAAP measure, operating income, in our third quarter 2023 Form 10-Q.

This press release also includes temperature-normalized non-GAAP EPS guidance for the year ended December 31, 2023. Alliant Energy believes this non-GAAP measure is useful to investors because the measure facilitates period-to-period comparison of Alliant Energy’s operating performance and provides investors with information on a basis consistent with measures that management uses to assess Alliant Energy’s earnings growth rate.

Reconciliations of the non-GAAP financial measures included in this press release to the most directly comparable GAAP financial measures are included in the earnings summaries that follow and in the case of temperature normalized non-GAAP EPS guidance, in the press release above.

Note: Unless otherwise noted, all “per share” references in this release refer to earnings per diluted share.

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