AKRON, Ohio, July 9, 2013 /PRNewswire/ -- FirstEnergy Corp. (NYSE: FE) announced today that it expects to deactivate two coal-fired power plants located in Pennsylvania by October 9, 2013. The decision is based on the cost of compliance with current and future environmental regulations in conjunction with the continued low market price for electricity. The plants scheduled to be deactivated are Hatfield's Ferry Power Station in Masontown, Pa., and Mitchell Power Station in Courtney, Pa. The total capacity of these plants is 2,080 megawatts, representing approximately 10 percent of the company's total generating capacity, but about 30 percent of the estimated $925 million cost to comply with the Environmental Protection Agency's Mercury and Air Toxics Standards (MATS). In total, about 380 plant employees and generation related positions are expected to be affected. Eligible employees will receive severance benefits through the FirstEnergy plan or as provided by their collective bargaining agreement. Following the deactivation of the Hatfield's Ferry and Mitchell power stations, FirstEnergy will continue to operate one of the nation's largest, cleanest and most diversified electric generating fleets. The company's fleet after the deactivations will be comprised of 56 percent coal, 22 percent nuclear, 13 percent renewables and 9 percent gas/oil, and will have a generating capacity of more than 18,000 megawatts. With the deactivation of these two plants, in addition to the nine plants the company announced for deactivation last year, nearly 100 percent of the power generated by FirstEnergy will come from resources that are either non- or low-emitting, including nuclear, hydro, pumped-storage hydro, natural gas and scrubbed coal units. The company expects to invest approximately $650 million in MATS-related control technology to enhance or modify existing air quality equipment or install new equipment on its remaining facilities. Following these upgrades, FirstEnergy expects to reduce emissions of nitrogen oxides by 84 percent, sulfur dioxide by 95 percent and mercury by 91 percent below 1990 levels. In addition, the company expects to reduce carbon dioxide emissions 20 to 30 percent below 1990 levels by 2020. The plant deactivations are subject to review for reliability impacts, if any, by PJM Interconnection, the regional transmission operator that controls the area where they are located.