White Stallion Energy Center, Sunflower Electric Power Corp., Tri-State Generation and Transmission Association Inc., Power4Georgians LLC, Deseret Power Electric Cooperative, and Tenaska Trailblazer Partners LLC asked the U.S. Court of Appeals for the District of Columbia Circuit October 19 to set a deadline by which the Environmental Protection Agency must finalize a rule reconsidering the mercury and air toxics standards for new power plants. The agency reiterated October 12 that it is on schedule to issue the final rule by March 2013, but the companies contend that it should be under a court order to ensure that it does. Legal challenges are on hold during administrative reconsideration.