DC Tie

PVREA Project

San Juan Basin Project

Valley Corridor Project

Big Sandy Project


High Plains Express

Nucla Sunshine Project

Wayne Child





Frequently Asked Questions


Tri-State has gathered background information about a few key topics as they pertain to transmission line construction and operations. 




Understanding the siting, environmental and permitting process


Tri-State uses an open and comprehensive siting process that considers electric system planning, economic, environmental, public involvement, regulatory, land rights and engineering considerations. 





Rights of way for power lines and access roads


Once a route is selected and the necessary land use permits have been obtained, Tri-State works directly with affected landowners and other statekholders to acquire the necessary power line and access easements for projects.





Information about undergrounding high-voltage transmission lines


High-voltage overhead transmission lines are a reliable, low cost, easily maintained, and an established method to transport bulk electricity across long distances. An underground line is expected to be 4 to 10 times the cost of an overhead line due to time, materials, process and the use of specialized labor. If a landowner or jurisdictional body wishes to bury a line, a formal request must be submitted to Tri-State.





Environmental Health


Electromagnetic fields (EMFs) are invisible lines of force associated with the production, transmission, and use of electric power such as those associated with high-voltage transmission lines, secondary power lines, and home wiring and lighting.  Many studies of EMF have been conducted but none have identified a mechanism where EMF can cause disease.  Tri-State encourages people to investigate the topic further.




Updated: September 30, 2009






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