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303-452-6111

  • https://www.tristategt.org/sites/tristate/files/revslider/image/TS_HomeHero_DNA_013119.jpg
    Collaboration is part of our Tri-State DNA – since 1952.
    Learn why
  • https://www.tristategt.org/sites/tristate/files/revslider/image/TS_HomeHero_Wind_020119.jpg
    Nearly a third of the electricity used by consumers comes from renewable resources.
    How we do it
  • https://www.tristategt.org/sites/tristate/files/revslider/image/Man_Woman_Sun_Hay-002.jpg
    Together, we are part of something bigger…a cooperative.
    Learn why
  • https://www.tristategt.org/sites/tristate/files/2019-02/TS_HomeHero_SpanishPeaks_013119.jpg
    We are doubling our emission-free solar generation with the 100-MW Spanish Peaks Solar Project.
    Learn more
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    With our 43 members, we power 1.3 million co-op and public power district consumers.
    What we do

Better together

Together. It’s a word that encompasses everything we do. We are an association of electric cooperatives and public power districts with a shared commitment to power the communities and lives of more than 1.3 million consumers across the rural West.

Our collaboration gives us the stability to deliver on our promise of delivering reliable, affordable and responsible electricity.  

We know that we are brighter, stronger and better when we work together.

Our culture

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.

Our service area

Our members

Working here

Annual report

Statement on Colorado PUC assertion of jurisdiction in DMEA complaint

"A private contract dispute, even between utilities, does not belong at the commission. This matter appropriately belongs in the courts."
Read more >

Tri-State and EDP Renewables announce 104 megawatt Crossing Trails Wind Farm

EDP Renewables’ Crossing Trails Wind Farm, located in eastern Colorado, is Tri-State’s fifth wind energy project investment
Read more >

Tri-State announces Duane Highley as next Chief Executive Officer

“As CEO, Duane will work with our board of directors to advance a strong vision for the association’s future,” said Rick Gordon, chairman and presiden...
Read more >

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1,556 EMPLOYEES

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43 MEMBERS

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5,500 MILES OF LINE

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1.3 MILLION CONSUMERS

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Tri-State Generation & Transmission Association
Office: 303-452-6111
1100 West 116th Avenue
Westminster, CO 80234

Mailing address:
PO Box 33695
Denver, CO 80233-0695

©2019 Tri-State Generation and Transmission Association, Inc. Power supplier to the rural west.

  • What we do
  • Financials
  • News
  • Operations
  • Work with us