The proposed Tres Amigas transmission project to be located in New Mexico, which would link three of the nation’s three power grids to share wind power across the United States, has attracted both eager allies and some determined foes. The Tres Amigas project would operate three power switching hubs connected by several miles of superconducting direct-current lines, on a 22.5-square-mile section near Clovis, N.M., adjoining Texas and Oklahoma. The hubs would direct power flows in and out of the three regions, whose electrical systems are not synchronized, creating bridges for electric power to flow across the entire country, wherever transmission capacity permitted. Read more about Tres Amigas.