Our cooperative approach to a clean grid starts now. Learn how we’re transforming with our Responsible Energy Plan.

Tri-State's mission is to provide our member systems a reliable, affordable and responsible supply of electricity in accordance with cooperative principles.

Being a cooperative is more than just our business model. It’s how we approach working together. We share knowledge, listen, collaborate and solve problems together.

Nucla Station retires from service 

The Nucla Station officially retired from service as a coal plant today, the cooperative announced. The end of generation occurred as the facility exh...
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Tri-State wholesale rate to remain unchanged for third consecutive year

For the third year in a row, Tri-State Generation and Transmission Association announced that wholesale rates for its 43 member systems will not incre...
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Three regional utilities announce decision to join Southwest Power Pool market

Basin Electric Power Cooperative, Tri-State Generation and Transmission Association, and the Western Area Power Administration (WAPA) announced Sept. ...
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1,500 EMPLOYEES

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43 MEMBERS

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5,665 MILES OF LINE

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1.3 MILLION CONSUMERS