Ameren’s 2,400-megawatt plant near Labadie, Missouri, ranks 2nd highest in mercury emissions nationwide, according to a Nov. 2011 report by the advocacy group Environment Missouri.
Updated at 5:50 p.m. to add comments from Senator Roy Blunt.
The U.S. Senate has rejected a bill that would have done away with new federal limits on mercury and other toxic air pollutants from power plants.
The resolution introduced by Republican Senator James Inhofe would have eliminated the Mercury and Air Toxics Standards finalized by the Environmental Protection Agency in December.