Atherton, CA 94027 solar market data
Updated May 13, 2026 By The SolarDNA Data Team
Atherton 94027 has 740 solar installations at a median installed cost of $5.10/W, installations down 17.2% over the trailing twelve months, and a Market Score of 34 — higher than 12% of U.S. zip markets.
Versus California
How 94027 compares with the state
Installed cost
$0.83/W above
state median $4.26/W
Market score
34 vs 53
California scores 53
Share of state installs
0.03%
of 2.3M tracked statewide
Battery attach
16.4%
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: 43–53 installs (midpoint 48)
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
94027 by year
53 installs in the trailing twelve months vs 64 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 94027
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | COBALT POWER SYSTEMS | 130 | 14 | 13.08 | $5.76 |
| 2 | TESLA | 96 | 0 | 14.15 | $5.12 |
| 3 | BAY AREA ENERGY SOLUTIONS | 60 | 5 | 13.99 | $4.70 |
| 4 | POCO SOLAR ENERGY | 24 | 0 | 9.31 | $5.98 |
| 5 | SUNPOWER | 22 | 0 | 10.32 | $4.79 |
| 6 | SUNRUN | 19 | 3 | 9.87 | $3.84 |
| 7 | CLEAN SOLAR | 16 | 0 | 9.56 | $5.07 |
| 8 | RGS ENERGY | 14 | 0 | 8.26 | $8.07 |
| 9 | SEMPER SOLARIS | 13 | 2 | 8.95 | $5.83 |
| 10 | YOUR ENERGY SOLUTIONS | 11 | 3 | 10.64 | $3.72 |
| 11 | ROCKIN ROOFERS | 10 | 2 | 13.61 | $4.33 |
| 12 | LUMINALT ENERGY | 10 | 0 | 10.79 | $6.51 |
Equipment
What gets installed in 94027
Share of systems with a recorded brand
Modules
SUNPOWER30.6%
LG ELECTRONICS11.5%
QCELLS NORTH AMERICA6.8%
TESLA6.7%
SANYO ELECTRIC OF PANASONIC GROUP5.0%
Inverters
SOLAREDGE24.7%
ENPHASE ENERGY23.3%
SUNPOWER23.3%
SMA AMERICA8.8%
TESLA6.1%
Frequently asked
Quick answers about 94027
How many solar installations are there in 94027?
SolarDNA counts 740 active solar installations in Atherton 94027, 728 of them residential, with data through May 13, 2026.
How much does solar cost in 94027?
The median residential system in 94027 cost $5.10 per watt over the trailing twelve months, $0.83/W above the California median.
Is solar growing in 94027?
Installations in 94027 are down 17.2%: 53 in the trailing twelve months versus 64 before.
Who installs solar in 94027?
COBALT POWER SYSTEMS, TESLA, BAY AREA ENERGY SOLUTIONS lead the 174 installers with systems in 94027. The full comp set is above.
Is 94027 a good market for solar sales?
94027 scores 34 out of 100 (Fair, higher than 12% of U.S. zip markets).