Castro Valley, CA 94552 solar market data
Updated March 15, 2026 By The SolarDNA Data Team
Castro Valley 94552 has 1,477 solar installations at a median installed cost of $4.54/W, installations down 3.8% over the trailing twelve months, and a Market Score of 43 — higher than 58% of U.S. zip markets.
Versus California
How 94552 compares with the state
Installed cost
$0.27/W above
state median $4.26/W
Market score
43 vs 53
California scores 53
Share of state installs
0.07%
of 2.3M tracked statewide
Battery attach
14.6%
state 12.7%
Statewide momentum
▲ 1.1%
residential solar added in California, 12 months through Jul 2026
Statewide market
2.3M systems
30.9% of homes · utility-reported through Jul 2026
Next-12-month outlook: 68–83 installs (midpoint 75)
Trailing-12-month installs carried forward at half the observed growth rate (capped at ±30%), with a ±10% band. Not a forecast of permits or policy.
Growth & pricing
94552 by year
76 installs in the trailing twelve months vs 79 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 94552
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | TESLA | 336 | 16 | 6.56 | $5.10 |
| 2 | SUNRUN | 215 | 10 | 5.73 | $4.56 |
| 3 | SUNPOWER | 95 | 0 | 6.1 | $4.35 |
| 4 | SEMPER SOLARIS | 52 | 4 | 6.29 | $4.16 |
| 5 | SYNERGY POWER CA | 47 | 0 | 7.38 | $3.63 |
| 6 | YOUR ENERGY SOLUTIONS | 40 | 2 | 5.93 | $3.76 |
| 7 | THE SOLAR COMPANY | 27 | 0 | 5.51 | $6.69 |
| 8 | PETERSENDEAN | 25 | 0 | 5.94 | $3.62 |
| 9 | INFINITY ENERGY | 19 | 0 | 6.29 | $4.63 |
| 10 | SUNGEVITY | 19 | 0 | 5.14 | $3.79 |
| 11 | HIGH DEFINITION SOLAR | 18 | 0 | 2.41 | $6.92 |
| 12 | FREEDOM FOREVER | 17 | 1 | 6.22 | $4.83 |
Neighboring zips
The nearest zip markets
By distance between zip centroids
| Zip | Distance | Installs | $/W | Score |
|---|---|---|---|---|
| 94546 Castro Valley | 3.8 km | 2,887 | $4.54 | 56 |
| 94542 Hayward | 6.1 km | 1,520 | $4.38 | 42 |
| 94541 Hayward | 6.3 km | 1,929 | $4.64 | 47 |
| 94578 San Leandro | 7.6 km | 914 | $4.91 | 49 |
| 94544 Hayward | 8.8 km | 3,341 | $4.25 | 46 |
| 94580 San Lorenzo | 8.9 km | 929 | $4.73 | 36 |
Same city
Other zips in Castro Valley
Equipment
What gets installed in 94552
Share of systems with a recorded brand
Modules
SUNPOWER14.8%
QCELLS NORTH AMERICA12.6%
LG ELECTRONICS6.5%
CSI SOLAR6.2%
REC SOLAR5.4%
Inverters
ENPHASE ENERGY30.1%
SOLAREDGE21.9%
SUNPOWER12.1%
TESLA10.6%
SMA AMERICA7.1%
Frequently asked
Quick answers about 94552
How many solar installations are there in 94552?
SolarDNA counts 1,477 active solar installations in Castro Valley 94552, 1,444 of them residential, with data through March 15, 2026.
How much does solar cost in 94552?
The median residential system in 94552 cost $4.54 per watt over the trailing twelve months, $0.27/W above the California median.
Is solar growing in 94552?
Installations in 94552 are down 3.8%: 76 in the trailing twelve months versus 79 before.
Who installs solar in 94552?
TESLA, SUNRUN, SUNPOWER lead the 212 installers with systems in 94552. The full comp set is above.
Is 94552 a good market for solar sales?
94552 scores 43 out of 100 (Good, higher than 58% of U.S. zip markets).