Tri-State Generation & Transmission Association, Inc.

P.O. Box 33695
Denver, CO 80233

Phone: (303) 452-6111


Tri-State G&T is a wholesale electric power supplier owned by the 43 electric cooperatives and public power districts that it serves. The association generates and transports electricity to its member systems in Colorado, Nebraska, New Mexico and Wyoming. Based in the Denver-metro area, Tri-State is Colorado’s second largest electric utility.