PG&E Service Area
Solar + Battery Storage in San Mateo County, CA
VoltSol gives 5 cities across San Mateo County a way to energy independence: residential solar paired with EG4 battery storage, from $8,700. Make your own power, store it, and keep the lights on through blackouts and PSPS shutoffs — instead of exporting it back to the grid for a fraction of what you paid under NEM 3.0.
County Snapshot — San Mateo County
Utility Rate
PG&E: Estimated $0.44/kWh residential rate. PG&E residential blended rate (E-TOU-C tier, 2025-2026 range). High rates make solar economics strong despite marine layer influence common on the Peninsula.
Permit Office
San Mateo County Planning and Building Department / Individual City Building Departments (San Mateo County / individual cities). Typical turnaround: 2-4 weeks; some cities adopting SolarAPP+. Redwood City, San Mateo, Daly City, and other cities have their own building departments. Unincorporated areas fall under San Mateo County Planning and Building. Several jurisdictions are adopting SolarAPP+ for expedited approval.
Climate Zone
Zone 3: Mild marine climate throughout the Peninsula. Coastal areas experience frequent marine layer, while inland areas (Redwood City, Menlo Park) see more sun. Moderate temperatures year-round with low cooling demand but reliable solar production.
County Context
San Mateo County encompasses the San Francisco Peninsula from the bay shoreline to the Pacific coast. Marine layer influence is common, especially along the coast and bay. Inland areas along Highway 101 (Redwood City, Menlo Park, San Mateo) experience less marine layer and better solar production. High PG&E rates throughout the county make solar economics strong despite lower cooling demand.
Tax credit, exemption, and incentive information is general and subject to change. Consult a licensed tax professional and your county appraisal district (or equivalent local authority) for guidance specific to your situation.
Why Solar + Battery Storage in San Mateo County?
Homeowners in San Mateo County are served by PG&E, which has seen significant residential rate increases in recent years. Residential solar + battery storage offers a way to lock in energy costs at installation prices and protect against future rate hikes.
Our systems combine rooftop solar panels, EG4 battery storage, and inverters to power your home's most energy-intensive loads — like heating, cooling, and major appliances — while maximizing the power you keep and use yourself. That means no utility buyback complexity under NEM 3.0, and backup power during PSPS shutoffs or outages.
Under California's current net-billing rules (NEM 3.0), the credit homeowners receive for solar energy they export is typically only a small fraction of the retail price they pay to buy electricity back. The smart economics in San Mateo County shifted to storing and using your own power instead of selling it back. The federal 30% residential solar tax credit ended for systems placed in service after Dec 31, 2025, but California programs like SGIP battery rebates may still apply. Consult a tax professional to confirm your eligibility.