Walnut Creek, CA solar installation & market data
Updated May 7, 2026 By The SolarDNA Data Team
Walnut Creek has 6,486 solar installations across 4 zip codes at a median installed cost of $4.24/W, installations up 7.0% over the trailing twelve months, and an installs-weighted Market Score of 48.
Active installations
6,486
Zip markets
4
Median cost
$4.24/W
12-mo growth
▲ 7.0%
Installers active
463
City Market Score
Great · installs-weighted across 4 zips
Best zip in Walnut Creek scores higher than 88% of U.S. zip markets.
Versus California
How Walnut Creek compares with the state
Installed cost
$0.03/W below
state median $4.26/W
Market score
48 vs 53
California scores 53
Share of state installs
0.29%
of 2.3M tracked statewide
Battery attach
10.5%
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: 387–473 installs (midpoint 430)
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 Creek by year
415 installs in the trailing twelve months vs 388 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Walnut Creek
Summed across every zip in the city
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | TESLA | 869 | 44 | 4 | $5.00 |
| 2 | SUNRUN | 643 | 49 | 4 | $4.28 |
| 3 | SUNPOWER | 247 | 0 | 4 | $4.33 |
| 4 | DIABLO SOLAR SERVICES | 226 | 6 | 4 | $4.45 |
| 5 | YOUR ENERGY SOLUTIONS | 207 | 10 | 4 | $4.16 |
| 6 | SOLAR TECHNOLOGIES | 202 | 16 | 4 | $4.51 |
| 7 | GOT WATTS ELECTRIC | 154 | 0 | 4 | $3.68 |
| 8 | CITADEL ROOFING AND SOLAR | 150 | 39 | 4 | $2.87 |
| 9 | PETERSENDEAN | 141 | 0 | 4 | $4.06 |
| 10 | QUICK SYSTEMS | 138 | 0 | 4 | $3.75 |
| 11 | WEST COAST SOLAR | 135 | 1 | 4 | $3.75 |
| 12 | SUNGEVITY | 119 | 0 | 4 | $4.19 |
| 13 | SKY POWER SOLAR | 108 | 0 | 4 | $4.29 |
| 14 | SEMPER SOLARIS | 104 | 5 | 4 | $4.52 |
| 15 | KOTA CONSTRUCTION | 98 | 0 | 4 | $4.73 |
| 16 | SOL R US ELECTRIC ENGINEERING | 92 | 0 | 4 | $3.44 |
| 17 | AMBROSE SOLAR | 75 | 11 | 4 | $4.90 |
| 18 | HOOKED ON SOLAR | 75 | 3 | 4 | $4.37 |
| 19 | SOLAR UNIVERSE | 71 | 0 | 4 | $5.30 |
| 20 | ROCKIN ROOFERS | 71 | 0 | 4 | $4.08 |
| 21 | FREEDOM FOREVER | 62 | 13 | 4 | $4.46 |
| 22 | ESP CONTRACTING | 61 | 1 | 4 | $3.81 |
| 23 | NEXT ENERGY | 55 | 0 | 4 | $7.28 |
| 24 | SOLAR OPTIMUM DESIGN ELECTRIC | 55 | 0 | 4 | $2.80 |
| 25 | BETTER EARTH | 49 | 0 | 4 | $3.91 |