Chicago utility ComEd orders two 19.8MW energy storage systems
Renewable Energy Systems Americas (RES) has received a contract from Chicago utility Commonwealth Edison (ComEd) for two 19.8MW energy storage systems.
The battery storage sytems will be connected to the local ComEd electric grid to provide real-time frequency regulation service to the PJM ancillary services market. Each unit will store 7.8MWh.