Bringing Research and Business Together for Colorado
Tri-State Generation and Transmission Associates (Tri-State)
1100 W. 116th Avenue
Westminister, CO 80234
303.452.6111 (phone)

Tri-State Generation and Transmission Associates

The Cooperative Spirit Builds Communities and a Better World

Tri-State and our 44 member electric co-ops are consumer-owned, democratically governed utilities firmly anchored in the seven cooperative principles – providing power and value to communities across the West through the strength of the cooperative business model.

Tri-State Generation and Transmission Association is a wholesale electric power supplier owned by the 44 electric cooperatives that it serves. Tri-State generates and transmits electricity to its member systems throughout a 200,000 square-mile service territory across Colorado, Nebraska, New Mexico and Wyoming.

Serving approximately 1.5 million consumers, Tri-State was founded in 1952 by its member systems to provide a reliable, cost-based supply of electricity. Headquartered in Westminster, Colo., nearly 1,200 people are employed by Tri-State throughout its four-state service area.

Tri-State’s power is generated through a combination of owned baseload and peaking power plants that use coal and natural gas as their primary fuels, supplemented by purchased power, federal hydroelectricity allocations and renewable resource technologies.

Tri-State's mission is to provide our member owners a reliable, cost-based supply of electricity while maintaining a sound financial position through effective utilization of human, capital and physical resources in accordance with cooperative principles.