2023 Tri-State Investor Presentation
OUR TRANSMISSION LINES SPAN THE WEST
Reliable electricity hinges on our multi-state transmission network. It carries electricity from our generation
resources to our members' distribution systems or to energy markets for sale. Our transmission network
includes lines, substations, telecommunications, maintenance centers and field offices.
Keeping the lights on for our members' consumers means our transmission system must be maintained
and invested in regularly. Because we own most of our transmission network, we can more quickly add
facilities and delivery points to serve our members' growing energy loads.
Tri-State eastern interconnection member load has been in the SPP RTO since 2014, with Tri-State
signing the SPP Membership Agreement in 2015. Regarding Tri-State's system in the western
interconnection, Tri-State joined SPP's Western Energy Imbalance Service (WEIS) Market on
February 1, 2021. In addition, Tri-State also expanded its participation in the CAISO Western Energy
Imbalance Market (WEIM) real-time energy market into New Mexico on April 1, 2021. With other balancing
authorities joining the WEIS in early spring 2023, all of Tri-State's remaining load and generation entered
organized markets. 100% of Tri-State's generation and member load is currently in organized markets.
RESILIENCE
422
BULK SUBSTATIONS
5,849
MILES OF LINE
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