Federal emission standards for mercury will be effective in 2015. DTE Energy, which has the biggest coal-fired power plant in the Midwest (4th biggest in the nation and 2nd largest producer of mercury emissions among 144 plants in the Great Lakes region) in Monroe, has stated it will be in compliance with the new standards by the deadline. The project to reduce mercury emissions by 85-95 percent is already half done, with two of the four units retrofitted already. Similar projects are slated for DTE’s plants at Belle River and St. Clair.