the & dist Alliant Energy Corporation Supplemental Information – November 5, 2021 Earnings Call 1 Alliant Energy Corporation Supplemental Information – November 5, 2021 Earnings Call Forward-Looking Statements These slides contain forward-looking statements, including 2021 and 2022 earnings guidance, terms of the WPL rate review settlement, details of our IPL advance ratemaking filing, information regarding forecasted effective income tax rates and other regulatory plans. Actual results could differ materia ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Name of Registrant, State of Incorporation, Address of Principal Executive Offices, Telephone Number, Commission File Number, IRS Employer Identification Number ALLIANT ENERGY CORPORATION (a Wisconsin Corporation) 4902 N. Biltmore Lane Madison, Wisconsin 53718 Telephone (608) 458-3311 Commissi ...

Summary of Alliant Energy Corporation Q3 2021 Earnings Conference Call Company Overview - **Company**: Alliant Energy Corporation (NASDAQ:LNT) - **Date of Call**: November 6, 2021 - **Participants**: - John Larsen – Chair, President and CEO - Robert Durian – Executive Vice President and CFO - Zach Fields – Lead Investor Relations Analyst Key Financial Highlights - **2021 Earnings Guidance**: Increased to a range of $2.61 to $2.67 per share, indicating a 12th consecutive year of 5% or greater earnings growth [6] - **2022 Earnings Guidance**: Projected range of $2.65 to $2.79 per share, reflecting anticipated growth of 5% to 7% [6] - **Dividend Increase**: Board approved a 6% increase in the annual common stock dividend to $1.71 per share [7] - **Q3 2021 GAAP Earnings**: Reported at $1.02 per share, up from $0.98 per share in Q3 2020, driven by higher revenue requirements and temperature-normalized sales [14] Operational Highlights - **Temperature Normalized Sales**: Retail electric sales increased by 4.1% year-over-year, attributed to pandemic recovery and minimal storm activity [15] - **Capital Expenditures**: Planned capital expenditures of approximately $7 billion from 2021 to 2025, averaging $1.4 billion per year, focused on cleaner energy and grid reliability [16][17] - **Solar Projects**: Commitment to add 1,500 megawatts of solar energy, with several projects underway in Wisconsin and Iowa [10][18] Environmental, Social, and Governance (ESG) Initiatives - **Tree Planting Commitment**: Plan to plant over 1 million trees over the next decade to support environmental efforts [9] - **Community Support**: $4 million commitment to the Hometown Care Energy Fund to assist customers with energy bills amid rising natural gas costs [11] - **Hunger Relief**: 15th Annual Drive Out Hunger event raised over $400,000, providing over 17 million meals to families in need [12] Challenges and Strategic Focus - **Cost Management**: Focus on controlling operational and maintenance costs to keep rates affordable for customers amid rising fuel prices [21] - **Supply Chain Issues**: Acknowledgment of inflation and supply chain uncertainties impacting capital expenditures, particularly for solar projects [26][17] - **Tax Considerations**: Estimated effective tax rate of -13% for 2021 and +6% for 2022, with expectations of being exempt from minimum tax provisions [20][38] Future Outlook - **Long-term CapEx Plans**: Anticipated $7 to $9 billion in capital expenditures for the following five years, focusing on cleaner energy sources and grid reliability [41] - **Regulatory Initiatives**: Ongoing regulatory filings for solar and storage projects, with decisions expected in 2022 [23][24] Conclusion - Alliant Energy is positioned for continued growth with a strong focus on clean energy initiatives, community support, and maintaining financial stability amid market challenges. The company remains committed to delivering consistent returns to investors while enhancing its operational capabilities and environmental stewardship.

Alliant Energy Corporation (NASDAQ:LNT) Q2 2021 Earnings Conference Call August 6, 2021 10:00 AM ET Company Participants Zach Fields - Lead Investor Relations Analyst John Larsen - Chair, President and CEO Robert Durian - Executive Vice President and CFO Conference Call Participants Michael Sullivan - Wolfe Research Operator Good morning. And welcome to Alliant Energy’s Conference Call for Second Quarter 2021 Results. This call is being recorded for rebroadcast. At this time, all lines are in listen-only mo ...

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION For the transition period from to Name of Registrant, State of Incorporation, Address of Principal Executive Offices, Telephone Number, Commission File Number, IRS Employer Identifica ...

Alliant Energy Corporation Supplemental Information – May 7, 2021 Earnings Call Alliant Energy Corporation Supplemental Information -- May 7, 2021 Earnings Call Forward-Looking Statements These slides contain forward-looking statements, including 2021 earnings guidance, terms of the WPL rate review settlement, information regarding forecasted effective income tax rates and regulatory plans. Actual results could differ materially, because the realization of those results is subject to many uncertainties incl ...

Alliant Energy Corporation (NASDAQ:LNT) Q1 2021 Earnings Conference Call May 7, 2021 10:00 AM ET Company Participants Susan Gille - Manager of IR John Larsen - Chairman, CEO & President Robert Durian - Executive VP & CFO Conference Call Participants Julien Dumoulin-Smith - Bank of America Andrew Weisel - Scotiabank Michael Sullivan - Wolfe Research Andrew Levi - Hite Hedge Operator Good morning, and welcome to Alliant Energy's Conference Call for First Quarter 2021 Results. This call is being recorded for ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Name of Registrant, State of Incorporation, Address of Principal Executive Offices, Telephone Number, Commission File Number, IRS Employer Identific ...

Financial Data and Key Metrics Changes - Alliant Energy reported 2020 GAAP earnings of $2.47 per share, an increase from $2.33 per share in 2019, reflecting a year-over-year growth of more than 7% when excluding non-GAAP adjustments and temperature impacts [24] - The company achieved a consolidated earnings per share of $2.47, finishing near the top of its original earnings guidance range [9][24] - Non-GAAP temperature normalized earnings grew more than 7% over 2019, marking the 10th consecutive year of achieving a 5% to 7% growth objective [9] Business Line Data and Key Metrics Changes - Temperature-normalized retail electric sales declined by 2% in 2020 compared to 2019, primarily due to the impacts of the COVID-19 pandemic and the derecho storm [26] - The sales recovery in the second half of 2020 was attributed to the strength and resiliency of the economies in the states served [26] Market Data and Key Metrics Changes - Wisconsin's unemployment rate is 1% lower than the U.S. average, with population growth observed as residents from neighboring states move to Wisconsin [27] - Iowa's economy is recovering faster, with the state having the second-lowest unemployment rate in the country and strengthening grain prices due to increased foreign demand [27] Company Strategy and Development Direction - Alliant Energy aims to achieve a 50% reduction in carbon emissions by 2030, having already reduced emissions by 42% compared to 2005 levels [12][99] - The company plans to add approximately 400 megawatts of new solar energy by 2023, following a successful 1 gigawatt wind energy expansion in Iowa [14][15] - The clean energy blueprint includes plans for at least 1,000 megawatts of new solar power in Wisconsin, with ongoing projects to support community solar initiatives [17][19] Management's Comments on Operating Environment and Future Outlook - Management expressed confidence in delivering solid returns for shareholders, with an expected 5% to 7% annual EPS growth rate through at least 2024 [28] - The company anticipates a solid path to achieving its earnings guidance for 2021, driven by investments in its core utility business [28] - Management acknowledged the challenges faced in 2020 but highlighted the company's resilience and operational success [9][22] Other Important Information - Alliant Energy's strategy includes a focus on advancing a clean energy future and improving grid resiliency through investments in technology and infrastructure [20][21] - The company has joined the Low-Carbon Resource Initiative to develop technologies for a low-carbon future [13] Q&A Session Summary Question: Can you repeat that stat about Iowa's renewable generation? - Management confirmed that Iowa is expected to achieve 50% of its generation from renewables by 2030, with a split of approximately 70% owned and 30% purchased [47][48] Question: What is the outlook for O&M expenses in 2021? - Management targets sustainable O&M reductions of approximately 3% to 5% annually, with a mix of sustainable and temporary savings identified in 2020 [49][53] Question: What are the potential rate filing outcomes in Wisconsin? - Management indicated that they are well-positioned for a rate filing and are evaluating whether it will cover one, two, or three years, with a focus on stabilizing rates [54][56] Question: Can you discuss the Columbia announcement and securitization prospects? - Management noted that they are considering the flexibility in their CapEx plan and the potential for securitization as a tool for balancing investor outcomes and customer costs [61][64] Question: How much of the carbon emissions reduction was due to the pandemic? - Management stated that while the pandemic contributed to fluctuations, the overall trajectory towards their 2030 goal remains on track [99][101]

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Name of Registrant, State of Incorporation, Address of Principal Executive Offices, Telephone Number, Commission File Number, IRS Employer Identification ...