Contact Us


Members Directory




We'd like to hear from you

As a member of an electric cooperative, you have a voice. Please let us know what's important to you.
Stay informed on future energy initiatives that affect you and your community.


1100 West 116th Avenue

Westminster, CO 80234


General Mailing Address:

P.O. Box 33695

Denver, CO 80233


FedEx and UPS deliveries:

3761 Eureka Way

Frederick, CO 80516



(303) 452-6111


If you have questions for a specific department at Tri-State, please direct your e-mail inquiries to the following contacts:


E-mail Addresses:


Corporate Communications

Development Projects


Information Technology

Investor Relations

Research and Development

System Operations

Transmission East

Transmission West






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