Solar in Castro Valley, CA
With PG&E's electricity at about 40.5¢ per kWh and 1,601 kWh of sun per kW, solar is worth it for a typical Castro Valley home today: about a 10.3-year payback.
- Payback, typical home
- 10.3 yrsCalifornia: 10.9 yrs
- 25-year net
- $24,257after paying $10,700
- Sun
- 1,601kWh per kW per year
- Electricity
- 40.5¢125% above U.S. average
A typical Castro Valley home, by the numbers
| Utility | PG&E |
|---|---|
| Electricity use | 405 kWh a month |
| Best-value system | 3 kW, about 7 panels, 4,803 kWh a year (99% of use) |
| Cost | $10,700 |
| First-year savings | $959 |
| Payback | 10.3 years |
| Exported power | 3.9¢/kWh (PG&E) |
Cash purchase, no federal credit, 4.0% yearly rate increases. Run it with your own numbers.
Homes in Castro Valley
- Owner-occupied homes
- 73%
- Single-family detached
- 73%
- Median home value
- $1.1M
- Median year built
- 1966
- Population
- 65,001
- Solar installs, last 3 years*
- 1,167
- Roofs suitable for solar†
- 97%
Census ACS 2020–2024. *Installations in public records for this area's ZIP codes. †Share of 17,884 buildings Google Project Sunroof rated technically suitable (2019 snapshot).
Older housing stock. Many homes here were built before 1975. Have the roof and electrical panel checked before signing; a roof or panel upgrade can add thousands. Roof first?
Installers working in Castro Valley
Companies with the most installations in Castro Valley's ZIP codes over the last 3 years, from public records. We don't take payment for placement.
- Sunrun 227 installs
- Tesla Energy 119 installs
- SunPower 88 installs
- Synergy Power 68 installs
- Bright OPS 49 installs
- Better Earth Electric 37 installs
- Semper Solaris 34 installs
- Solar Optimum Design & Electrical 34 installs
- Your Energy Solutions 28 installs
- Kota Construction 26 installs
Always verify the license and get at least three quotes. Compare quotes side by side.
Questions about solar in Castro Valley
Is solar worth it in Castro Valley, CA?
For a typical home in Castro Valley, solar is worth it at 2026 prices: a 3 kW system costs about $10,700 after state incentives, saves about $959 in year one and pays back in about 10.3 years. Enter your address for an estimate based on your roof and bill.
How much solar power does a system produce in Castro Valley?
About 1,601 kWh per year for each kW of panels on a south-facing roof, based on PVWatts and local weather. That's 3% less than the California average. East- or west-facing roofs produce roughly 10–20% less.
Who is the electric utility in Castro Valley?
Most homes in Castro Valley are served by PG&E, at about 40.5¢ per kWh on average.
How much do solar panels cost in Castro Valley?
A fair cash price is around $2.90 per watt before incentives, so about $10,700 for a 3 kW system. There's no federal tax credit for homeowners who buy in 2026.
Nearby
- San Lorenzo 10.2 yrs
- San Leandro 10.3 yrs
- Hayward 10.2 yrs
- Union City 10.2 yrs
- San Ramon 10.2 yrs
- Danville 10.1 yrs
- Dublin 10.1 yrs
- Oakland 10.3 yrs
- All of California
Data: PVWatts (National Laboratory of the Rockies), EIA-861 2025 adjusted to 2026, U.S. Census ACS, LBNL Tracking the Sun, state policy research as of October 2026.