The Environmental Protection Agency's acting regional administrator sent a letter Wednesday to Kansas Health and Environment Secretary Rod Bremby.
Hays-based Sunflower Electric Power Corp. wants to build its coal-fired plant in Finney County. Sunflower had wanted to build two plants, but Bremby rejected an air-quality permit for the project in October 2007.
Sunflower's new proposal arises from a deal it struck in May with Gov. Mark Parkinson. The company filed a revised application for an air-quality permit with KDHE last month.
EPA spokesman David Bryan said the federal agency wants to make sure that KDHE has public hearings on the Sunflower proposal.
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