Harris News Service: A federal district court judge in Washington, D.C., will hear environmentalists argue Friday against a motion to dismiss their case challenging Sunflower Electric’s plans for new power plants. The Sierra Club and EarthJustice want the court to reverse the federal Rural Utilities Service’s approval of Sunflower’s two proposed coal-fired power plants near Holcomb. The groups say RUS accepted the plans without considering environmental damage and possible alternatives, which …