Agencies such as the California Air Resources Board (CARB) are providing funding to transform California's school bus fleet to Zero Emissions Vehicles. You can track the progress of another State of California program, the California Energy Commission School Bus Replacement Program, at this website: CEC Funded School Buses.
To see the total number of electric buses to-date from all programs, the California Energy Commission's Medium- and Heavy-Duty Zero Emissions Vehicles dashboard can be filtered to display the number of electric buses in San Diego County.