Pennsylvania’s largest coal-fired power plant will soon be closing its doors. Homer City Generation announced Monday it will retire its units in Indiana County over the next three months. The facility will have “tiered layoffs” until then, gradually releasing the remaining 129 employees. Company leaders say they would take the facility off line by June 2nd, citing competing pressures from cheap natural gas and complying with environmental regulations. The massive power plant, which was built in the late 1960s, generated enough power to provide energy for two-million homes.