Alliant Energy Corporation · NASDAQ:LNT
Alliant Energy — Corporate Update (May 2026)
20 slides from Alliant Energy's corporate update, May 2026
Slide 1: Columbia Wind Hampden Township Presentation
Columbia Wind Hampden Township Presentation May 2026
Slide 2: Agenda
Agenda 01 About Us 02 Project Background 03 Project Timeline 04 Common Questions 05 Conclude 2
Slide 3: About us
About us Serving customers with Balanced energy mix safe, reliable and resilient energy 440 communities served 500,000 electric customers 200,000 natural gas customers 1,300+ employees 3 *% based on MWs
Slide 4: Why Columbia County?
Why Columbia County? • Long-term landowner relationships • Established, successful community relationships/partnerships • Wind fits well with ag • Strong wind resources • Cost-effective grid connection 4
Slide 5: Columbia Wind Project Overview
Columbia Wind Project Overview Thoughtful siting to minimize disturbance • Less than 2 acres per turbine • ~98% of land in project boundary undisturbed by construction • Continuing to engage with landowners and to refine construction planning and minimize disturbance Project goals • 47 turbines • 27
Slide 6: Columbia Wind Community Benefits
Columbia Wind Community Benefits Annual Shared Revenue • New tax revenue • Landowner Townships payments $600,817 • Jobs $785,683 43% • Commitment to 57% County community 6
Slide 7: Turbine Technology
Turbine Technology Tip/Total Height Hub Height Swept Area >1,400 feet 7
Slide 8: Projected Timeline
Projected Timeline Past 2025 2026 2027 2028 Landowner and Community Outreach Env. and Tech. Studies Permitting & Reg. Operating Agreements Equipment Procurement Engineering Construction 8 *Preliminary, subject to change
Slide 9: Common Questions
COMMON QUESTIONS Alliant Energy.
Slide 10: Sound and Shadow
Sound and Shadow Sound • Code*: “wind energy system does not exceed 50 dBA during daytime hours and 45 dBA during nighttime hours.” Plus, post-monitoring and complaint process. • Our commitment: 45 dBA or less at all times Shadow • Code*: no more than 30 hours…mitigation down to 20 hours • Our commi
Slide 11: Notices and Outreach
Notices and Outreach • Code*: 90 days before filing an application and within 1 mile of a wind turbine • Our Commitment: ‒ Letter notifications within 1 mile of the project boundary. Regularly updating the distribution mail list as we learn of mis-receipt or changes of address. Email notifications a
Slide 12: Decommissioning / End of Project-life
Decommissioning / End of Project-life • We are following the state process • Our Commitment: Restoration standards plus goal of full recyclability of wind turbines and equipment, including blades 12
Slide 13: Environmental Development Studies
Environmental Development* Studies • We are following the state process Critical Issues Analysis Eagle Surveys • Our commitment: Small Bird/Avian Use 1) Using a variety of means and methods, Surveys we will avoid, minimize, and monitor Endangered and (before and after construction) Threatene
Slide 14: Aircraft Detection Lighting System (ADLS)
Aircraft Detection Lighting System (ADLS) What is it? 14
Slide 15: Aircraft Detection Lighting System (ADLS)
Aircraft Detection Lighting System (ADLS) How does it work? 15
Slide 16: Contact Us
Contact Us Open office hours • Wednesday mornings at our local office • 125 East James Street, Columbus Project Phone# • (608) 716-9823 Email • CommunityAffairs@alliantenergy.com Website • www.alliantenergy.com/ColumbiaWind
Slide 17: Thank You
THANK YOU Alliant Energy.
Slide 18: Sound (visual aid)
Sound (visual aid) Columbia Wind “…measurements shall be made as near as possible to the outside wall nearest to the closest wind turbine…” -PSC128 18
Slide 19: Shadow (visual aid)
Shadow (visual aid) 19
Slide 20: Environmental (visual aid)
Environmental (visual aid) 20 20