Minnesota Power is proposing to build the Great Northern Transmission Line to bring clean, emission-free energy into Minnesota, meet growing energy demands and increase system reliability. The Great Northern Transmission Line, which will deliver hydropower generated by Manitoba Hydro to customers in the United States, will consist of a 500 kV transmission line from the Minnesota-Manitoba border to the Blackberry 500 kV Substation near Grand Rapids, Minnesota, as well as associated substation facilities and transmission system modifications at the Blackberry 500 kV Substation site.
At the beginning of Project planning, Minnesota Power anticipated development of two transmission lines and associated facilities - the Project and a separate 345 kV transmission line. The 345 kV transmission line, as previously described, would have run between the Blackberry Substation and the Arrowhead Substation near Hermantown, Minnesota. However, Minnesota Power determined that there was not sufficient transmission service requests to support the 345 kV transmission line. Therefore, Minnesota Power is not pursuing the 345 kV transmission line at this time.
Several priorities are driving the need for the Great Northern Transmission Line including: