Mayhew Lake Energy Storage System

The Applicant proposes to construct and operate a battery energy storage system with a nominal power rating of up to 100 MW alternating current with approximately 400 megawatt-hours of energy capacity on a site consisting of approximately 37 acres adjacent to the Northern States Power Mayhew Lake Substation in Sauk Rapids Township, Benton County, Minnesota. In addition to battery energy storage enclosures, the facility will also include a project substation, power conversion facilities (inverters and transformers), underground collection cables, an operations and maintenance (O&M) building, and other associated facilities, such as fencing, access roads, and stormwater basins. The project will connect to the existing Northern States Power Mayhew Lake Substation via an approximately 250-foot, 115 kilovolt (kV) transmission line.