SDG&E adds energy storage and microgrids to strengthen grid reliability

SAN DIEGO – Following a summer of record temperatures in California, San Diego Gas & Electric announced Oct. 12 the start of testing for the company’s new 40 MW energy storage project in Fallbrook and the start of construction on one of four energy storage and microgrid projects that will bring an additional 39 MW of battery capacity to the region.

SDG&E has been rapidly expanding its energy storage portfolio. The company has about 95 MW of utility-owned energy storage currently available, with another 200+ MW in development.

SDG&E Vice President of Energy Innovation Miguel Romero was joined by San Diego Councilmember Raul Campillo as well as local business and labor leaders to break ground on the Elliott Microgrid located at SDG&E’s existing substation in Tierrasanta.

“Innovations like storage and microgrids are vital to building a more resilient electric grid that can extend the availability of renewable energy into peak demand hours and better prepare communities to manage through emergencies,” said Romero.

During last month’s heatwave, energy storage, in addition to energy conservation efforts, helped California avoid rotating outages. California has increased investment in energy storage since 2020 and the state now has close to 4,000 MW of batteries. These batteries provided an estimated 4% of the electricity supply during peak demand to help avert rotating outages.

Within SDG&E’s service territory, utility-scale battery storage systems – utility and third party-owned – served as much as 7% of the regional load during peak hours of the heatwave.

Microgrids are small-scale grids that can operate independent of or parallel to the larger regional grid will also help keep critical community facilities powered during unexpected outages.

Construction of the Fallbrook energy storage facility has been completed, and the facility is undergoing testing to be connected to the state energy market so the California Independent System Operator can dispatch these resources as needed to balance energy supply and demand throughout the state. The Fallbrook facility will be able to store a total of 40 MW of energy or enough to energize 25,000 homes.

Battery storage works by capturing renewable resources like wind and solar when they are abundant during the day, then sending that energy back to the grid when it is needed, such as at night when the sun has set or when energy supply is tight during hot summer months.

For more information, visit SDGEnews.com

Submitted by San Diego Gas & Electric.