Construction of the Big Stone South to Ellendale 345-kV Transmission Line began in 2016. It will extend 163 miles from Big Stone City, South Dakota to Ellendale, North Dakota. Otter Tail Power Company and Montana-Dakota Utilities Co. own this project that's estimated to cost $240 million to $300 million. We expect to energize the line in 2019.
Improved reliability of the regional electrical system.
Increased system capacity to address growth in regional demand.
Supports public policy by enabling renewable energy to be integrated into the system.
Boosts regional economies by creating construction jobs and supporting local businesses.
The Midcontinent Independent System Operator, Inc. (MISO), an independently governed organization tasked with ensuring transmission network reliability and efficiency in the Midwest, conducted planning studies to determine the need for upgrades and changes to the transmission grid. For more than 10 years, MISO studied and incorporated the BSSE project into planning models.
Following the identification of a preferred route, Montana-Dakota Utilites Co. and Otter Tail Power Company filed applications with the apporpriate regulatory commissions.
We began initial engineering and design early in project development. In spring 2016 we finalized engineering and design.
Land agents continue to coordinate with landowners along the final route.
In summer 2016 construction began. To prepare for construction, we finalized easement agreements with landowners and completed the line's design.
We expect the BSSE transmission line to be in service in 2019.