SDG&E Unveils Four Advanced Microgrids to Boost Grid Resilience

San Diego Gas & Electric unveiled four new microgrids featuring advanced remote operation capabilities and state-of-the-art safety technologies to help enhance grid reliability and bolster resiliency for the surrounding communities.

The four microgrid and energy storage sites are located in:

• Clairemont, California
• Tierra Santa, California
• Paradise, California
• Boulevard, California

SDG&E said these additional microgrids will help address surging energy demands in the San Diego region, especially during hot summer days and the peak evening hours when solar power generation typically diminishes and there is a significant strain on the grid.

"Storage and microgrids are key to helping build a more resilient electric grid that can extend the availability of cleaner energy and help our communities better manage through grid emergencies like the extreme heat experienced in recent summers," said Caroline Winn, SDG&E's CEO. "These microgrids will actively dispatch clean energy to the grid when needed and help improve energy resiliency for critical facilities like fire stations, schools, and cooling centers in San Diego."

Remote Operation and Monitoring of Microgrids

The utility company said the ability to remotely operate microgrids offers real-time monitoring, faster response to grid events, more efficient energy storage management, and enhanced grid resilience designed to help, optimize overall performance, reliability, and sustainability. These systems utilize lithium iron phosphate (LFP) battery cells and have advanced safety and fire prevention features.

In December 2021, the California Public Utilities Commission granted the green light to SDG&E to move forward with these innovative projects. The four microgrids will operate independently or in tandem with the larger regional grid and offer a combined storage capacity of approximately 39 megawatts (MW) and 180 megawatt-hours (MWh) across four SDG&E substations.

"For communities like mine that often experience outages during power emergencies, we welcome infrastructure that will help keep our lights on and our refrigerators running during difficult times," Nora Vargas, San Diego County board supervisor. "Enhancing our power grid is an important first step in making sure all communities have access to basic resources during a crisis, especially for our local schools, fire stations, and medical centers."

Assisting the Energy Balance Across the State

In December 2021, the California Public Utilities Commission granted the green light to SDG&E to move forward with these projects. The four microgrids will operate independently or in tandem with the larger regional grid and offer a combined storage capacity of approximately 39 megawatts (MW) and 180 megawatt-hours (MWh) across four SDG&E substations.

These projects were set into motion in response to Gov. Gavin Newsom's state emergency proclamation in the summer of 2021. These facilities will be connected to the state energy market, allowing the California Independent System Operator (CAISO) to dispatch these resources as needed to help maintain a balanced supply and demand of energy throughout the state.

Clairmont Microgrid

The Clairemont Microgrid serves the Balboa Branch Library/Cool Zone, Fire Station 36, and local schools such as Lafayette Elementary, Sequoia Elementary, Innovation and CPMA Middle Schools, and Madison High School.

Elliott Microgrid

The Elliott Microgrid will generate 10MW and can power Fire Station 39, the Tierrasanta Public Library/Cool Zone, Tierrasanta Medical Center, Jean Farb Middle School, Canyon Hills High School, and Tierrasanta and Kumeyaay Elementary Schools.

Paradise Microgrid

The Paradise Microgrid can power Fire Stations 51 and 32, the Southeast Division Police Department, and Bell Middle School, as well as Freese, Boone, and Fulton Elementary

Boulevard Microgrid

The Boulevard Microgrid serves the San Diego County Sheriff's Department, Fire Station 47, Campo Reservation Fire Station, Cal Fire White Star Station, Campo Tribal Office, Campo Kumeyaay Nation Medical Center, Southern Indian Health Council Campo Clinic, the Boulevard Border Patrol Station, and the Boulevard Post Office.

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