Napa County, CA solar installation & market data
Updated May 28, 2026 By The SolarDNA Data Team
Napa County has 11,251 solar installations across 12 zip codes at a median installed cost of $4.56/W, installations up 18.1% over the trailing twelve months, and an installs-weighted Market Score of 49.
Active installations
11,251
Zip markets
12
Median cost
$4.56/W
12-mo growth
▲ 18.1%
Installers active
679
County Market Score
Great · installs-weighted across 12 zips
Best zip in Napa County scores higher than 97% of U.S. zip markets.
Versus California
How Napa County compares with the state
Installed cost
$0.30/W above
state median $4.26/W
Market score
49 vs 53
California scores 53
Share of state installs
0.50%
of 2.3M tracked statewide
Battery attach
14.3%
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: 902–1,102 installs (midpoint 1,002)
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
Napa County by year
919 installs in the trailing twelve months vs 778 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Napa County
Summed across every zip in the county
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 1,457 | 191 | 10 | $4.39 |
| 2 | TESLA | 1,338 | 39 | 11 | $5.09 |
| 3 | GREEN STOCK SOLAR | 481 | 30 | 8 | $3.66 |
| 4 | SUNPOWER | 436 | 3 | 8 | $4.55 |
| 5 | CITADEL ROOFING AND SOLAR | 299 | 58 | 9 | $3.11 |
| 6 | AMBROSE SOLAR | 294 | 31 | 10 | $4.62 |
| 7 | V3 ELECTRIC | 263 | 19 | 5 | $4.94 |
| 8 | SEMPER SOLARIS | 200 | 11 | 8 | $4.54 |
| 9 | BRIGHT OPS | 189 | 74 | 7 | $5.05 |
| 10 | NORTHERN PACIFIC POWER | 183 | 0 | 7 | $4.14 |
| 11 | HIGH DEFINITION SOLAR | 180 | 0 | 4 | $7.03 |
| 12 | SOLARCRAFT SERVICES | 170 | 8 | 11 | $5.76 |
| 13 | FREEDOM FOREVER | 169 | 18 | 9 | $4.74 |
| 14 | PETERSENDEAN | 164 | 0 | 8 | $3.84 |
| 15 | HOOKED ON SOLAR | 141 | 7 | 7 | $4.38 |
| 16 | RGS ENERGY | 137 | 0 | 9 | $6.77 |
| 17 | BETTER EARTH | 124 | 0 | 7 | $5.34 |
| 18 | NAPA ELECTRIC SHOP | 116 | 5 | 7 | $4.27 |
| 19 | A1 SOLAR POWER | 110 | 0 | 9 | $6.57 |
| 20 | SUNTEGRITY SOLAR | 96 | 7 | 7 | $4.33 |
| 21 | SPG SOLAR | 94 | 0 | 8 | $7.56 |
| 22 | SUNGEVITY | 93 | 0 | 9 | $4.24 |
| 23 | ROCKIN ROOFERS | 88 | 8 | 7 | $4.65 |
| 24 | EMPOWER ELECTRIC | 87 | 0 | 4 | $5.00 |
| 25 | SUN FIRST | 85 | 0 | 8 | $5.47 |
Zip markets
Zips in Napa County
Ranked by installations · click for the zip market
| Zip | Installs | $/W | Score |
|---|---|---|---|
| 94558 | 5,657 | $4.53 | 55 A |
| 94503 | 1,946 | $4.34 | 45 C |
| 94559 | 1,511 | $4.57 | 47 B |
| 94574 | 921 | $4.88 | 43 C |
| 94515 | 597 | $4.79 | 39 C |
| 94508 | 225 | $4.74 | 37 D |
| 94599 | 154 | $4.40 | 38 D |
| 94567 | 117 | $5.24 | 34 D |
| 94573 | 53 | $6.05 | 30 F |
| 94562 | 45 | $5.37 | 33 D |
| 94576 | 24 | $3.56 | 42 C |
| 94581 | 1 | — | 38 D |