Investor Presentaiton

Multi-year growth expected from ALLETE Clean Energy ALLETE clean energy. SMART. POWERFUL. AHEAD. 1,050 MW 750 MW 550 MW 2018 1,300 MW w/Caddo 2024 ⚫Glen Ullin contributing full year in 2020 •South Peak contributing three quarters year in 2020 •Refurbishment project contributing full potential in 2021 •Diamond Spring contributing full year earnings in 2021 •Caddo built by end of 2021 •Deployment of remaining 100%, 80% and 60% PTC turbines •Additional renewable platform opportunities creates more upside (solar, storage solutions, fleet optimization, renewable services) 14 ALLETE

View entire presentation