Nov. 1 was the official retirement date of Hennepin Power Plant, according to Vistra Energy, which has operated the facility. Employees are currently wrapping up some of the final activities now that the plant has ceased operation. After that, a small number of employees will remain onsite to perform decommissioning activities for the plant. Initial decommissioning tasks are to close the plant safely, ensure environmental and regulatory rules are met, and inventory equipment to determine what to keep or sell to third parties. The Hennepin Power Plant was one of four coal plants Vistra Energy announced would be closed in Illinois.