Boreas Intertie

The Boreas Intertie project is being developed to provide an outlet for new renewable energy generation, and improve power system operation, in Montana and the northern Rocky Mountain region.

The first leg will 325 mile, 500 kV AC line running from Colstrip, MT to the Medicine Bow, WY area, connecting to the northern terminus of the TransWest Express Transmission Project.

The second leg will consist of a new 230 kV interconnection and transmission system between Ft. Peck, MT and the Colstrip, MT Area. This new line will begin as a single-circuit 230 kV line running 110 miles from Ft. Peck, MT to Circle, MT and then continue south as a double-circuit 230 kV line terminating at Colstrip, MT.

The third leg will consist of a new 425-mile 500 kV HVDC transmission line running from Colstrip, MT to Bismarck, ND. Once built this transmission line will connect the Western Electricity Coordinating Council (WECC) and the Midcontinent Independent System Operator (MISO).

The Boreas line will link these two large and important regional energy markets, facilitate energy transmission between the northern tier states, and add reliability and opportunity for new energy generation in Montana and the northern Rocky Mountain region.

The project route will follow existing transmission line corridors in order to minimize impacts on the environment and communities of Montana and Wyoming.

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