Sioux Energy Center has 29 groundwater monitoring wells, 18 of which have been polluted above federal advisory levels based on samples collected between March 16, 2016 and November 15, 2019. Groundwater at this site contains unsafe levels of boron, molybdenum, sulfate, lithium and cobalt.
Site descriptionAmeren Energy Company’s Sioux Energy Center is in West Alton, Missouri along the banks of the Mississippi River in St. Charles County. Sioux began operations in 1967 and has a generating capacity of 972-MW with two coal-fired units. Sioux had been scheduled to be retired by 2028, until 2022 when Ameren announced the company had pushed back this retirement date to 2030. Plant Sioux’s surface impoundments, SCPB, SCPC, SCPA and SCL4A, are all regulated under the CCR rule.
You can find the industry-reported data here. For more information about the Sioux ENergy Center, see EIP's 2019 National Coal Ash Report.