The approximately 160-170 mile 345-kv BSSE Transmission Line will connect a new Big Stone South Substation about three miles west of Big Stone City in Grant County, South Dakota, and a new Ellendale substation about 1.5 miles west of Ellendale in Dickey County, North Dakota. Project owners, Otter Tail Power Company and Montana-Dakota Utilities Co., anticipate the project to cost between $293 million and $370 million. The three-year construction period began in 2016.
The projects will:
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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.