Lamar – Missile Site Line is a 345kV overhead line with a length of 482.80km from Lamar, Colorado, US, to Missile Site, US.

The project is expected to be commissioned in 2025.


Lamar – Missile Site Line is an overhead line that will be operated by Tri-State Generation and Transmission Association. The line will carry alternating current (AC) through double circuit cable.

Approximately $900m was financed by the authorities to undertake the construction works of the project.

Lamar – Missile Site Line project development status

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The construction works on the Lamar – Missile Site Line project will be commenced in 2023 and commissioning is expected in 2025.

About Tri-State Generation and Transmission Association

Tri-State Generation and Transmission Association Inc (Tri-State) is a not-for-profit member-owned wholesale electric power generation and transmission utility. It produces using coal, natural gas, oil and renewable sources. The company owns, operates and has interests in various power plants, and is also sources power through long-term purchase contracts. Under long-term purchase power contracts with its members, Tri-State also sources renewable energy capacity. Under long term wholesale electric service contracts, it transmits electricity to its member customers.


All publicly-announced T&D Line & Substation projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects is sourced through secondary information sources such as country specific utility players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.