Big Stone Plant has 15 groundwater monitoring wells, 15 of which have been polluted above federal advisory levels based on samples collected between September 07, 2016 and August 14, 2017. Groundwater at this site contains unsafe levels of lithium, sulfate, boron, cobalt, molybdenum, arsenic, lead and radium.Site description
Otter Tail Power's Big Stone Plant opened in 1975 and is located on the banks of the Big Stone Lake, South Dakota. It has one coal-fired generating unit that is capable of producing 456 MW of electricity. The plant has two units regulated under the CCR rule: Slag Pond Area and Ash Disposal Area. CCR is also temporarily stored on-site in the Temporary Storage Area, located right next to the Slag Pond Area. You can find the industry-reported data here. For more information on the Big Stone Plant, see EIP’s 2019 National Coal Ash Report .