AES Energy Storage, a unit of AES Corp., unveiled two Advancion battery-based energy storage sites, totaling 37.5 megawatts (MW), in partnership with San Diego Gas & Electric.

One of the sites, located at an SDG&E substation in Escondido, Calif., hosts a 30 MW, four-hour duration energy storage project. The second is at a substation in El Cajon, Calif.

Both SDG&E sites join more than 200 MW of installed Advancion battery storage capacity deployed around the world.

In July 2016, SDG&E fast-tracked energy storage projects to enhance regional grid reliability and selected Advancion 4, AES' fourth-generation battery-based energy storage platform. SDG&E says it accelerated the deployment of battery-based energy storage to improve reliability and allow integration of greater amounts of renewable energy moving forward.

Located at SDG&E substations in Escondido and El Cajon, the Advancion energy storage arrays will provide 37.5 MW of power and serve as a 75 MW flexible resource to the grid. Combined, the arrays will provide enough capacity to power approximately 25,000 homes for four hours. Both arrays incorporate batteries by Samsung SDI and power conversion systems by Parker Hannifin.