S.2643: A bill to amend the Clean Air Act to require the Administrator of the Environmental Protection Agency to promulgate regulations to control hazardous air pollutant emissions from electric utility steam generating units.

Mercury Emissions Control Act - Amends the Clean Air Act to require the Administrator of the Environmental Protection Agency (EPA) to propose regulations to: (1) control the emission of hazardous air pollutants, including mercury pollutants, from electric utility steam generating units; and (2) require a reduction of not less than 90% in such mercury emissions.