Project quick facts

345 kV line – about 70 miles
Targeted in-service – 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 is an approximately 70-mile, 345 kV transmission line being 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), as 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. Xcel Energy is the development manager. Construction began in November, 2015 and is expected to be complete in 2017.

South Dakota permitting

The South Dakota Public Utilities Commission must issue a Facility Permit before transmission line construction.