Big Stone South – Brookings Line is a 345kV overhead line with a length of 104.6km from Big Stone County, Minnesota, US, to Brookings County, South Dakota, US.

Construction works on the Big Stone South – Brookings Line started in 2016 and the project was commissioned in 2017.


The Big Stone South – Brookings Line, which is an overhead line, is being operated by Otter Tail Power. The Big Stone South – Brookings Line is an upgrade line. The line carries alternating current (AC) through double circuit cable.

Approximately $225m was financed by the authorities to undertake the construction works of the project.

Big Stone South – Brookings Line project development status

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The development of the Big Stone South – Brookings Line project was approved by Minnesota Public Utilities Commission in 2016 and the project works were completed in 2017.

Contractors involved

Xcel Energy was appointed by Otter Tail Power to supply the cables for executing the 345kV Big Stone South – Brookings Line.

About Otter Tail Power

Otter Tail Power Company (Otter Tail) a subsidiary of Otter Tail Corporation is an electric utility that generates, transmits and distributes electricity. The utility’s products comprise electric plenum heaters, electric boilers, thermal-storage systems, radiant-heat systems and heat pumps. It owns and maintains electric transmission lines in Minnesota, North Dakota, and South Dakota. Otter Tail’s transmission system transmits electricity from generation plants. The utility offers rate options, rebates, and demand-response and conservation programs. It also offers off-peak programs. Otter Tail is headquartered in Fergus Falls, Minnesota, the US.


All publicly-announced T&D Line & Substation projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects is sourced through secondary information sources such as country specific utility players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.