Ameren plans to spend billions of dollars to install additional pollution control equipment on its fleet of power plants. Improving environmental performance allows the company to keep generating power while meeting mandates to lower emissions. This helps Ameren Missouri meet its commitment to provide its customers with a reliable supply of power.
  
Ameren Missouri is installing scrubbers to comply, in advance, with the federal Clean Air Interstate Rule (CAIR). CAIR requires a major reduction in sulfur dioxide (SO2) and nitrogen oxide (NOx) emissions on a regional scale by 2015 to help areas in the eastern U.S. achieve healthier air quality.
  
The Sioux scrubbers will be capable of removing approximately 95% of the SO2 from the boiler flue gas while burning either low-sulfur or high-sulfur coals.
  
In addition, Ameren and its subsidiaries are exploring renewable energy options, including opportunities to convert waste, wind and sunlight into electricity.