Alliant Energy — Corporate Update (December 2025)

4 slides from Alliant Energy's corporate update, Dec 17, 2025

Slide 1: Iowa Advance Ratemaking Settlement
Alliant Energy Corporation Iowa Advance Ratemaking Settlement December 17, 2025
Slide 2: Cautionary Statements
Cautionary Statements Forward-looking Statements The information on slides 3 and 4 contains forward-looking statements, including terms of the non- unanimous wind advance ratemaking settlement agreement. Actual results could differ materially because the realization of those results is subject to ma
Slide 3: Iowa Advance Ratemaking Settlement
Iowa Advance Ratemaking Settlement Powering today while building a sustainable energy future – for our customers and communities Providing customer base rate stability while enabling growth ✓ Reflects priorities of stakeholder organizations and our commitment to advancing economic development growth
Slide 4: Iowa Advance Ratemaking Settlement – Docket RPU-2025-0003
Iowa Advance Ratemaking Settlement Docket RPU-2025-0003 Additional details of non-unanimous wind advance ratemaking settlement agreement Cost cap Any actual capital costs above the cost cap will be included in the ESM at IPL’s non-advance ratemaking ROE until a prudency determination as part of the