El Cajon, CA solar installation & market data
Updated April 23, 2026 By The SolarDNA Data Team
El Cajon has 16,888 solar installations across 4 zip codes at a median installed cost of $4.18/W, installations down 0.6% over the trailing twelve months, and an installs-weighted Market Score of 49.
Active installations
16,888
Zip markets
4
Median cost
$4.18/W
12-mo growth
▼ 0.6%
Installers active
784
City Market Score
Great · installs-weighted across 4 zips
Best zip in El Cajon scores higher than 97% of U.S. zip markets.
Versus California
How El Cajon 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
0.75%
of 2.3M tracked statewide
Battery attach
5.7%
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
Next-12-month outlook: 574–702 installs (midpoint 638)
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
El Cajon by year
640 installs in the trailing twelve months vs 644 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in El Cajon
Summed across every zip in the city
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 2,924 | 114 | 3 | $4.62 |
| 2 | TESLA | 1,126 | 17 | 3 | $5.12 |
| 3 | SEMPER SOLARIS | 960 | 0 | 3 | $4.08 |
| 4 | BAKER ELECTRIC SOLAR | 898 | 0 | 3 | $4.04 |
| 5 | SOLARTECH ENERGY SYSTEMS | 506 | 0 | 3 | $3.72 |
| 6 | BRIGHT PLANET SOLAR | 401 | 25 | 3 | $5.16 |
| 7 | SUNPOWER | 382 | 39 | 3 | $4.75 |
| 8 | SULLIVAN SOLAR POWER | 347 | 0 | 3 | $4.37 |
| 9 | STELLAR SOLAR | 288 | 11 | 3 | $3.99 |
| 10 | ASI HEATING AIR | 213 | 0 | 3 | $3.69 |
| 11 | SUNGEVITY | 208 | 0 | 3 | $4.06 |
| 12 | FREEDOM SOLAR POWER TX | 189 | 0 | 3 | $4.38 |
| 13 | BLALOCK ELECTRIC | 180 | 11 | 3 | $3.26 |
| 14 | MILHOLLAND ELECTRIC | 164 | 0 | 3 | $4.84 |
| 15 | SOLAIRE ENERGY SYSTEMS | 144 | 0 | 3 | $6.83 |
| 16 | SUNLINE ENERGY | 140 | 4 | 3 | $3.53 |
| 17 | SUNLIGHT SOLAR | 136 | 2 | 3 | $4.65 |
| 18 | SOLAR WEST | 136 | 0 | 3 | $5.39 |
| 19 | PALOMAR SOLAR | 134 | 1 | 3 | $3.61 |
| 20 | PETERSENDEAN | 133 | 0 | 3 | $3.83 |
| 21 | HOME ENERGY SYSTEMS | 129 | 3 | 3 | $3.93 |
| 22 | JAMAR ELECTRIC SAN DIEGO | 117 | 0 | 3 | $3.48 |
| 23 | INFINITY ENERGY | 113 | 2 | 3 | $5.14 |
| 24 | GREEN SOURCE | 106 | 0 | 3 | $2.33 |
| 25 | SOLARE ENERGY | 96 | 0 | 3 | $4.17 |