Castro Valley, CA 94546 solar market data
Updated April 21, 2026 By The SolarDNA Data Team
Castro Valley 94546 has 2,887 solar installations at a median installed cost of $4.54/W, installations up 37.5% over the trailing twelve months, and a Market Score of 56 — higher than 98% of U.S. zip markets.
Zip Market Score
Excellent · higher than 98% of zips
Versus California
How 94546 compares with the state
Installed cost
$0.28/W above
state median $4.26/W
Market score
56 vs 53
California scores 53
Share of state installs
0.13%
of 2.3M tracked statewide
Battery attach
13.5%
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: 226–306 installs (midpoint 266)
Trailing-12-month installs carried forward at half the observed growth rate (capped at ±30%), with a ±15% band. Not a forecast of permits or policy.
Growth & pricing
94546 by year
231 installs in the trailing twelve months vs 168 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 94546
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 574 | 77 | 5.4 | $4.55 |
| 2 | TESLA | 413 | 12 | 5.63 | $5.12 |
| 3 | SUNPOWER | 152 | 0 | 7.57 | $4.65 |
| 4 | SEMPER SOLARIS | 104 | 3 | 5.44 | $4.27 |
| 5 | SYNERGY POWER CA | 96 | 0 | 5.92 | $3.77 |
| 6 | PETERSENDEAN | 66 | 0 | 5.03 | $3.91 |
| 7 | THE SOLAR COMPANY | 60 | 0 | 4.63 | $6.06 |
| 8 | YOUR ENERGY SOLUTIONS | 59 | 5 | 6.29 | $3.86 |
| 9 | BRIGHT OPS | 58 | 27 | 4.79 | $7.12 |
| 10 | BETTER EARTH | 58 | 0 | 6.79 | $4.60 |
| 11 | HIGH DEFINITION SOLAR | 53 | 0 | 2.81 | $7.86 |
| 12 | KOTA CONSTRUCTION | 44 | 0 | 5.53 | $5.61 |
Neighboring zips
The nearest zip markets
By distance between zip centroids
| Zip | Distance | Installs | $/W | Score |
|---|---|---|---|---|
| 94541 Hayward | 3.2 km | 1,929 | $4.64 | 47 |
| 94552 Castro Valley | 3.8 km | 1,477 | $4.54 | 43 |
| 94578 San Leandro | 4.0 km | 914 | $4.91 | 49 |
| 94580 San Lorenzo | 5.2 km | 929 | $4.73 | 36 |
| 94542 Hayward | 5.5 km | 1,520 | $4.38 | 42 |
| 94579 San Leandro | 6.5 km | 729 | $4.54 | 41 |
Same city
Other zips in Castro Valley
Equipment
What gets installed in 94546
Share of systems with a recorded brand
Modules
QCELLS NORTH AMERICA13.9%
SUNPOWER11.6%
CSI SOLAR6.9%
YINGLI ENERGY CHINA6.8%
LG ELECTRONICS4.5%
Inverters
ENPHASE ENERGY37.0%
SOLAREDGE27.0%
SUNPOWER9.6%
TESLA6.9%
SMA AMERICA3.9%
Frequently asked
Quick answers about 94546
How many solar installations are there in 94546?
SolarDNA counts 2,887 active solar installations in Castro Valley 94546, 2,856 of them residential, with data through April 21, 2026.
How much does solar cost in 94546?
The median residential system in 94546 cost $4.54 per watt over the trailing twelve months, $0.28/W above the California median.
Is solar growing in 94546?
Installations in 94546 are up 37.5%: 231 in the trailing twelve months versus 168 before.
Who installs solar in 94546?
SUNRUN, TESLA, SUNPOWER lead the 288 installers with systems in 94546. The full comp set is above.
Is 94546 a good market for solar sales?
94546 scores 56 out of 100 (Excellent, higher than 98% of U.S. zip markets).