DC Tie

PVREA Project

San Juan Basin Project

Valley Corridor Project

Big Sandy Project


High Plains Express

Nucla Sunshine Project

Wayne Child







Tri-State owns (wholly or jointly) or has maintenance responsibilities for more than 5,558 miles of transmission line across Colorado, Nebraska, New Mexico and Wyoming. Line crews and substation technicians work to ensure power delivery is safe and reliable.


Tri-State continues to invest in transmission infrastructure to ensure dependable power delivery to its 43 member cooperatives throughout its four-state service territory. The West’s vast power supply network is currently strained – improvements and expansion to the system are essential to enhancing regional power reliability.


Additional transmission facilities open the door to diverse energy resources that include renewable energy. The investments in additional lines support renewable energy projects by alleviating transmission constraints to make projects economically viable. Expanding Tri-State's transmission network facilitates the G&T's ongoing pursuit of additional renewable resources.



The majority of consumers served by Tri-State’s member systems live in rural areas. Rural communities receive many benefits from new transmission, including greater power reliability and increased opportunities for economic development.



How transmission lines deliver power


While the power plants output electricity at voltages of 13,000 to 24,000 volts, transformers step up power for overhead transmission lines to between 115,000 and 500,000 volts (or 115 to 500 kilovolts).  As voltage increases, current decreases, which more efficiently carries the power across extended distances.


The high voltages transmitted across the transmission lines cannot be used by households or businesses. Distribution networks operated by Tri-State's member cooperatives provide the gateway between power transmission and power use. The transmission grid and distribution networks converge at substations where transformers step down the voltage and deliver it to end-use consumers.


Transmission system map

Source: EDAW





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