Walnut, CA solar installation & market data
Updated May 6, 2026 By The SolarDNA Data Team
Walnut has 2,885 solar installations across 2 zip codes at a median installed cost of $4.17/W, installations up 9.7% over the trailing twelve months, and an installs-weighted Market Score of 49.
Active installations
2,885
Zip markets
2
Median cost
$4.17/W
12-mo growth
▲ 9.7%
Installers active
409
City Market Score
Great · installs-weighted across 2 zips
Best zip in Walnut scores higher than 84% of U.S. zip markets.
Versus California
How Walnut compares with the state
Installed cost
$0.09/W below
state median $4.26/W
Market score
49 vs 53
California scores 53
Share of state installs
0.13%
of 2.3M tracked statewide
Battery attach
15.4%
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: 213–261 installs (midpoint 237)
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
Walnut by year
226 installs in the trailing twelve months vs 206 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Walnut
Summed across every zip in the city
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | TESLA | 561 | 21 | 1 | $5.12 |
| 2 | SUNRUN | 335 | 93 | 2 | $3.88 |
| 3 | SUNPOWER | 155 | 10 | 2 | $4.48 |
| 4 | LEONARD ROOFING | 85 | 0 | 1 | $2.28 |
| 5 | SOLARMAX | 79 | 0 | 1 | $3.29 |
| 6 | FREEDOM FOREVER | 65 | 5 | 1 | $3.39 |
| 7 | SOLAR VAST | 60 | 0 | 1 | $4.05 |
| 8 | VERENGO | 50 | 0 | 1 | $4.57 |
| 9 | BURKE ELECTRIC | 48 | 0 | 1 | $5.00 |
| 10 | TRUE POWER SOLAR | 38 | 0 | 1 | $4.47 |
| 11 | SUNGEVITY | 37 | 0 | 1 | $4.02 |
| 12 | PETERSENDEAN | 37 | 0 | 1 | $3.33 |
| 13 | SOLAR OPTIMUM DESIGN ELECTRIC | 37 | 0 | 1 | $2.80 |
| 14 | TRUEPOWER SOLAR | 33 | 0 | 1 | $4.46 |
| 15 | BRIGHT OPS | 32 | 2 | 1 | $4.24 |
| 16 | SEMPER SOLARIS | 30 | 0 | 1 | $4.03 |
| 17 | AMERICAN SOLAR DIRECT | 29 | 0 | 1 | $6.00 |
| 18 | SWSS ELECTRIC | 24 | 0 | 1 | $1.37 |
| 19 | LA SOLAR GROUP | 22 | 0 | 1 | $3.94 |
| 20 | FUTURE ENERGY SAVERS | 21 | 0 | 1 | $9.29 |
| 21 | SUNLUX ENERGY | 20 | 0 | 1 | $3.11 |
| 22 | ELITE ELECTRIC | 20 | 0 | 1 | $5.68 |
| 23 | POWUR | 19 | 0 | 1 | $3.71 |
| 24 | SUNSHINE PACIFIC GROUP AMERICA | 18 | 0 | 1 | $4.38 |
| 25 | V3 ELECTRIC | 17 | 1 | 1 | $3.40 |