Johnson Junction Substation is a 345kV substation located in Johnson, Big Stone County, Minnesota, US.
The Johnson Junction Substation project’s construction is expected to begin in 2024. The works are expected to be commissioned in 2025.
Description
Johnson Junction Substation project, which is an upgrade substation, will be operated by Otter Tail Power.
The designed voltage level of the substation is 345/230kV and the operating voltage level is 345/230kV.
The step-in voltage of the project is 345kV and the step-out voltage is 230kV. Upon completion, the substation will have a capacity of 336MVA.

US Tariffs are shifting - will you react or anticipate?
Don’t let policy changes catch you off guard. Stay proactive with real-time data and expert analysis.
By GlobalDataJohnson Junction Substation project development status
The project is expected to be commissioned in 2025.
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.
Methodology
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.