Minnesota Power’s 224-mile, 500 kV Great Northern Transmission Line crossed protected wetlands, remote areas, and peat bogs up to 40 feet deep. Excavation was prohibited across approximately 80% of the route, creating significant foundation and access challenges.
More than 2,000 MAGNUM® Helical Piles and MUG grillages supported approximately 800 transmission tower foundations. The all-steel system eliminated excavation and concrete curing while allowing pile capacity to be verified during installation.
Crews continued installation through winter conditions and environmentally sensitive wetlands. The transmission line was energized approximately six months ahead of schedule. The project demonstrates how helical pile foundations can support large-scale transmission construction in remote and challenging terrain.
