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Court Orders Ameren to Install Controls at Two Plants

On September 30, 2019, the U.S. District Court for the Eastern District of Missouri entered judgment in the long-awaited remedy phase of United States v. Ameren Missouri. In a 157-page opinion, the court ordered Ameren to (1) apply for a PSD permit, including wet flue gas desulfurization (wet FGD) for SO2 control within 90 days for its Rush Island plant; (2) begin achieving an SO2 emission rate from Rush Island Units 1 and 2 “no less stringent than 0.05 lb SO2/mmBtu on a 30-day rolling average within four and one-half years; and (3) install emission controls on the Labadie plant units “as least as effective as dry sorbent injection” within three years and to operate such emission controls “until Ameren has achieved emissions reductions totaling the same amount as the excess emissions from Rush Island.” Ameren has said it will appeal.

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