PSC Public Hearing for Proposed Battery Energy Storage Project

BISMARCK, N.D. (PSC) The North Dakota Public Service Commission (PSC) will hold a public hearing on Friday, October 23, regarding a proposal to construct a battery energy storage system in Cass County, North Dakota. Harmony Storage, LLC (a subsidiary of Geronimo Power, LLC) is requesting a siting permit for a 200-megawatt battery energy storage system with a four-hour duration to store excess power. The project also includes associated inverters, transformers, underground cables and other ancillary facilities such as fencing, roads, storm water facilities and a Battery Management System. The project will connect to the Harmony Solar collector substation via underground collection lines. The estimated cost of the project is $249 million. The Project will be capable of storing surplus power from the Harmony Solar collector substation and the existing electric grid when production exceeds system demand (oversupply). If the grid has excess energy (e.g., during periods of low demand), thi