Portola Valley, CA solar installation & market data
Updated April 20, 2026 By The SolarDNA Data Team
Portola Valley has 1,001 solar installations across 1 zip code at a median installed cost of $5.36/W, recent growth not yet measurable, and an installs-weighted Market Score of 38.
Active installations
1,001
Zip markets
1
Median cost
$5.36/W
12-mo growth
—
Installers active
12
City Market Score
Fair · installs-weighted across 1 zips
Best zip in Portola Valley scores higher than 27% of U.S. zip markets.
Versus California
How Portola Valley compares with the state
Installed cost
$1.09/W above
state median $4.26/W
Market score
38 vs 53
California scores 53
Share of state installs
0.04%
of 2.3M tracked statewide
Battery attach
18.7%
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
Growth & pricing
Portola Valley by year
45 installs in the trailing twelve months vs 56 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Portola Valley
Summed across every zip in the city
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | TESLA | 250 | 4 | 1 | $6.62 |
| 2 | COBALT POWER SYSTEMS | 172 | 4 | 1 | $5.40 |
| 3 | SEMPER SOLARIS | 24 | 0 | 1 | $6.89 |
| 4 | SUNRUN | 23 | 0 | 1 | $4.59 |
| 5 | AKEENA SOLAR | 21 | 0 | 1 | $7.78 |
| 6 | RGS ENERGY | 20 | 0 | 1 | $8.40 |
| 7 | SUNPOWER | 20 | 0 | 1 | $5.33 |
| 8 | CLEAN SOLAR | 19 | 0 | 1 | $4.59 |
| 9 | ROCKIN ROOFERS | 18 | 3 | 1 | $4.50 |
| 10 | BAY AREA ENERGY SOLUTIONS | 17 | 2 | 1 | $5.40 |
| 11 | REC SOLAR COMMERCIAL | 17 | 0 | 1 | $4.83 |
| 12 | CINNAMON SOLAR | 15 | 0 | 1 | $6.08 |
Zip markets
Zips in Portola Valley
Ranked by installations · click for the zip market
| Zip | Installs | $/W | Score |
|---|---|---|---|
| 94028 | 1,001 | $5.36 | 38 D |