Transforming For Our Future

Rush Island Energy Center Ameren Missouri • • . In Aug. 2021, U.S. Court of Appeals affirmed the U.S. District Court's Sep. 2019 order to install a flue gas desulfurization system at the Rush Island Energy Center Reversed the District Court's order to install a dry sorbent injection system at the Labadie Energy Center - In Nov. 2021 Court of Appeals issued order denying Ameren Missouri's rehearing request In Dec. 2021, Ameren Missouri announced its intention to retire the energy center in lieu of installing a scrubber; requested a modification from the District Court to facilitate the accelerated retirement and address any reliability issues In Jan. 2022, MISO issued preliminary assessment of reliability impacts due to the accelerated retirement - Identified transmission upgrades and additional voltage support needed on the transmission system to ensure reliability Preliminary assessment presented to District Court in Feb. 2022 On Feb. 28, 2022, filed MISO Attachment Y notice; expect MISO's draft report in May District Court is under no deadline to issue final order MoPSC Staff reviewing Ameren Missouri's plans to retire Rush Island; under no deadline to issue a final report Expect to file an update to the 2020 Integrated Resource Plan with MoPSC in June 2022 First Quarter 2022 Earnings | May 6, 2022 Ameren 9

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