This article comes from SNL and is authored by Marcy Crane FERC on April 9 signed off on an agreement among Tres Amigas LLC, the Southwestern Public Service Co. and the Southwest Power Pool Inc. that will let the Tres Amigas “superstation” interconnect with Southwestern’s transmission system. The commission’s acceptance of the interconnection agreement (ER13-912) is the latest milestone reached by Tres Amigas…