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 Jamestown 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 serve as starting point for potential needs in Futures 2 and 3 Under Future 1, MISO estimates ~$30 billion of transmission investment is needed; under Future 3 ~$100 billion is needed Agreement reached on cost allocation to sub-region benefiting from projects; pending FERC approval MISO Tranche 1 projects identified Projects totaling $10 billion Includes certain projects crossing Missouri and Illinois Expect MISO approval of Tranche 1 projects in late July 2022 First Quarter 2022 Earnings | May 6, 2022 Ellendale Iron Range Alexandria Benton Big Stone South Cassie's Crossing Jump River Eau Claire, Rocky Run Wilmarth Tremval North Rochester Columbia Nelson Road Oneida Duck Lake Webster Franklin Beverly Marshalltown Morgan Hiple Madisono Orient Sub 92 Burr Oak Skunk River Maple Leesburg Ottumwa Zachary Ipava Brokaw Meredosia Morrison Ridge Tazewell Gilman Reynolds Paxton Fairport Sidney Maywood Thomas Tranche 1 (345kV) Existing Transmission Projects as of 03/07/2022 Source: MISO 10

View entire presentation