EPA has signed a proposed rule that would impose a federal implementation plan (FIP) under the Clean Air Act to improve air quality around three Oklahoma coal-fired power plants by requiring the facilities to install control technology or switch to cleaner burning natural gas to reduce sulfur dioxide emissions. According to EPA, the proposed FIP is projected to result in a reduction of approximately 61,000 tons of sulfur dioxide annually. The Oklahoma Gas & Electric (OG&E) plant near Muskogee, the OG&E Sooner plant in north central Oklahoma and the American Electric Power/Public Service Co. of Oklahoma plant northeast of Tulsa will have three years to add sulfur dioxide scrubbers, switch to natural gas or use a combination of these two approaches to reduce emissions if the proposed rule becomes final. EPA will accept comments on the proposed rule for 60 days after it is published in the Federal Register.