California Energy Storage Showcase

Integrating multiple renewable energy technologies with energy storage to support power grid reliability.

Borrego Springs, California is an inland desert town of less than 3,000 electric customers with four golf courses and no stoplights, and is served by a single electric transmission line. San Diego Gas & Electric (SDG&E) installed a 1.5 MWh solar photovoltaic system integrated with a battery storage system at their Borrego Springs substation as part of a broader distributed energy storage plan. The objective is that the 6 MW of substation-connected battery energy storage system and the nearly 5 MW of customer-owned battery energy storage connected to date will improve local power grid reliability for the town in normal conditions and outage events. If successful, the larger microgrid demonstration will prove the effectiveness of integrating multiple renewable energy technologies, energy storage, feeder automation system technologies, and outage management systems with advanced controls and communication systems to improve power grid reliability.

See more information about SDG&E's Project.

solar battery storage system solar battery storage system solar battery storage system

Photos courtesy of SDG&E.



Demonstrating the value of energy storage to provide:

  • Reliability
  • Renewable integration
  • Ancillary services
  • Better customer utility service

Type of Technology

Lithium-Ion battery - An energy-storage chemistry that is common in consumer electronics. Lithium-Ion batteries are also growing in popularity in electric vehicles and grid storage applications.

Quick Facts

  • Power Capacity Ratings: One 500 kW substation and three 25 kW community energy storage units.
  • Energy Capacity Ratings: 1500 kWh substation and 50 kWh community energy storage units.
  • Type of Energy Storage: Lithium-ion batteries.
  • Key Applications: Peak load shifting, energy arbitrage, renewable smoothing and intermittent resource integration.

Key Developers and Partners

  • SDG&E
  • U.S. Department of Energy
  • California Energy Commission
  • Horizon Energy Group
  • Lockheed Martin
  • Pacific Northwest National Laboratory
  • University of San Diego
  • Alpha Ten
  • Xanthus Consulting International

Energy Commission Funding

$2.8 million


Completed and operational.


Location of Integrated Solar Photovoltaic Energy Storage project in California