Project quick facts

345 kV line – about 70 miles
In-service – September 8, 2017
Fact sheet
Route map (overview – PDF)
Route map (overview – JPG)
Detailed route maps (aerial photos)


Big Stone South-Brookings County 345 kV project

The Big Stone South-Brookings County project was energized September 8, 2017.  The project is a 70-mile, 345 kV transmission line built between a new Big Stone South Substation near Big Stone City, S.D., and the Brookings County Substation near Brookings, S.D.

The project is one of 16 multi-value projects (MVP)approved by the Midwest Independent Transmission System Operator (MISO) in December 2011. The MVPs will help expand and enhance the region’s transmission system, reduce congestion, provide access to affordable energy sources and meet public policy requirements, including renewable energy mandates.

  • Xcel Energy and Otter Tail Power Company are joint owners of the project.