Ameren’s non-rate-regulated power plants, most of them in Illinois, will benefit from more than $2 billion to be spent over the next five years to add pollution control equipment to meet federal requirements for significantly reducing plant emissions, including mercury. For example, at AmerenEnergy Generating Company’s Coffeen Power Station, a new scrubber will remove more than 95 percent of the plant’s sulfur dioxide emissions by late 2009.