More clean energy. Fewer emissions.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.

Tri-State announces retirement of all coal generation in Colorado and New Mexico

Today Tri-State announced the retirement of its remaining New Mexico coal-fired power plant and its remaining Colorado coal plants and coal mine.
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Tri-State announces transformative Responsible Energy Plan actions to advance cooperative clean energy

“We’re not just changing direction, we’re emerging as the leader of the energy transition,” said Duane Highley, Tri-State’s chief executive officer.
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Tri-State seeks dismissal of Colorado Public Utilities Commission complaint

Several Colorado members of not-for-profit cooperative power supplier Tri-State Generation and Transmission Association expressed support today.
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46 Members

5,665 Miles of Line

1.3 Million Consumers