Napa, CA 94558 solar market data
Updated April 21, 2026 By The SolarDNA Data Team
Napa 94558 has 5,657 solar installations at a median installed cost of $4.53/W, installations up 30.1% over the trailing twelve months, and a Market Score of 55 — higher than 97% of U.S. zip markets.
Zip Market Score
Excellent · higher than 97% of zips
Versus California
How 94558 compares with the state
Installed cost
$0.27/W above
state median $4.26/W
Market score
55 vs 53
California scores 53
Share of state installs
0.25%
of 2.3M tracked statewide
Battery attach
14.4%
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: 440–596 installs (midpoint 518)
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
94558 by year
450 installs in the trailing twelve months vs 346 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 94558
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 846 | 113 | 6.79 | $4.37 |
| 2 | TESLA | 584 | 25 | 8.84 | $5.12 |
| 3 | GREEN STOCK SOLAR | 333 | 19 | 7.75 | $3.64 |
| 4 | CITADEL ROOFING AND SOLAR | 163 | 41 | 7.37 | $2.94 |
| 5 | AMBROSE SOLAR | 163 | 21 | 11.75 | $4.51 |
| 6 | SUNPOWER | 126 | 1 | 35.03 | $4.79 |
| 7 | SEMPER SOLARIS | 117 | 9 | 7.3 | $4.63 |
| 8 | HIGH DEFINITION SOLAR | 117 | 0 | 3.28 | $6.99 |
| 9 | V3 ELECTRIC | 114 | 10 | 6.4 | $4.92 |
| 10 | BRIGHT OPS | 90 | 39 | 5.88 | $5.39 |
| 11 | NORTHERN PACIFIC POWER | 89 | 0 | 8.21 | $4.21 |
| 12 | HOOKED ON SOLAR | 88 | 5 | 7.21 | $4.31 |
Neighboring zips
The nearest zip markets
By distance between zip centroids
| Zip | Distance | Installs | $/W | Score |
|---|---|---|---|---|
| 94599 Yountville | 10.9 km | 154 | $4.40 | 38 |
| 94562 Oakville | 12.6 km | 45 | $5.37 | 33 |
| 94573 Rutherford | 14.5 km | 53 | $6.05 | 30 |
| 94559 Napa | 18.5 km | 1,511 | $4.57 | 47 |
| 94574 Saint Helena | 19.0 km | 921 | $4.88 | 43 |
| 94508 Angwin | 21.5 km | 225 | $4.74 | 37 |
Same city
Other zips in Napa
Equipment
What gets installed in 94558
Share of systems with a recorded brand
Modules
QCELLS NORTH AMERICA13.4%
SUNPOWER12.7%
CSI SOLAR7.5%
REC GROUP6.2%
LG ELECTRONICS5.9%
Inverters
ENPHASE ENERGY38.9%
SOLAREDGE26.1%
SMA AMERICA7.7%
TESLA6.9%
SUNPOWER5.7%
Frequently asked
Quick answers about 94558
How many solar installations are there in 94558?
SolarDNA counts 5,657 active solar installations in Napa 94558, 5,263 of them residential, with data through April 21, 2026.
How much does solar cost in 94558?
The median residential system in 94558 cost $4.53 per watt over the trailing twelve months, $0.27/W above the California median.
Is solar growing in 94558?
Installations in 94558 are up 30.1%: 450 in the trailing twelve months versus 346 before.
Who installs solar in 94558?
SUNRUN, TESLA, GREEN STOCK SOLAR lead the 463 installers with systems in 94558. The full comp set is above.
Is 94558 a good market for solar sales?
94558 scores 55 out of 100 (Excellent, higher than 97% of U.S. zip markets).