Transforming For Our Future

MISO Long-Range Transmission Planning Roadmap Ameren Creating and capitalizing on opportunities for investment for the benefit of our customers, shareholders and the environment Ameren Transmission • • In Apr. 2021, MISO issued report outlining preliminary long- range transmission planning roadmap through 2039 Generation resources in MISO states are rapidly evolving Significant additions of renewable generation are expected Significant transmission investments needed to meet additional reliability needs and enable clean energy transition Projected transmission needs reflected in Future 1 roadmap serve as starting point for potential needs in Futures 2 and 3 Future 1 in line with 100% of then-current utility IRPS and 85% of utility announcements, state mandates or goals Under Future 1, MISO estimates -$30 billion of transmission investment is needed; under Future 3 -$100 billion is needed Indicative maps represent potential transmission needs vs. final proposals Process to assess specific transmission projects has commenced Agreement reached on cost allocation to sub-region benefiting from projects; pending FERC approval Expect MISO approval of certain projects in Future 1 roadmap in late July 2022 First Quarter 2022 Earnings | May 6, 2022 Voltage Level (kV) 345 500 765 Future 1 Future 1, 2, 3 DC Line Source: MISO 30

View entire presentation