Big Stone South to Brookings

The Big Stone South to Brookings project involves 70 miles of new 345-kV double-circuit line with poles capable of adding another double-circuit in the future. Along with the new 345-kV line, the project cost estimate includes a new substation near Big Stone and a 2-mile spur of 230-kV single circuit line.  The project is located in one of the best wind generation resource areas in the country, and will dramatically increase the ability to integrate new generation, according to the project partners. The project is estimated to facilitate up to 800 MW of new generation. The project was designated a multi-value project (MVP) in the Midwest ISO’s 2011 MTEP plan, and it is also part of the CapX2020 plan.

Project Sponsor Line Miles Voltage (kV) From State To State Year in Service
Otter Tail Power Co. 70 345 SD SD 2017
Estimated Costs ($M) Voltage Type Project Status Project Group Origin Point Destination Point
140 Operating MVP1 Big Stone South Substation Brookings
Interstate Build Start NERC ISO/RTO Country Project Partners
2015 MRO MISO US Xcel Energy and Otter Tail Power Company