By Ehren Goossens & Christopher Martin -2013-02-01T00:01:00ZFirst Solar Inc. (FSLR), the world’s largest thin-film solar manufacturer, may receive the lowest rates ever for selling U.S. solar power, less than electricity from new coal plants, for a project it purchased in New Mexico, according to a regulatory filing. First Solar bought the 50-megawatt Macho Springs project from Element Power Solar, according to a statement yesterday. El Paso Electric Co. (EE) agreed to buy the power for 5.79 cents a kilowatt-hour, according to a Jan. 22 procedural