El Cajon, CA 92020 solar market data
Updated April 23, 2026 By The SolarDNA Data Team
El Cajon 92020 has 5,062 solar installations at a median installed cost of $4.17/W, installations up 19.8% over the trailing twelve months, and a Market Score of 54 — higher than 97% of U.S. zip markets.
Zip Market Score
Excellent · higher than 97% of zips
Versus California
How 92020 compares with the state
Installed cost
$0.09/W below
state median $4.26/W
Market score
54 vs 53
California scores 53
Share of state installs
0.22%
of 2.3M tracked statewide
Battery attach
5.6%
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: 246–300 installs (midpoint 273)
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
92020 by year
248 installs in the trailing twelve months vs 207 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 92020
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 794 | 33 | 5.75 | $4.58 |
| 2 | TESLA | 346 | 2 | 6.37 | $5.12 |
| 3 | SEMPER SOLARIS | 304 | 0 | 6.21 | $4.11 |
| 4 | BAKER ELECTRIC SOLAR | 294 | 0 | 7.1 | $4.07 |
| 5 | SUNPOWER | 174 | 38 | 23.18 | $4.57 |
| 6 | SULLIVAN SOLAR POWER | 147 | 0 | 8.03 | $4.49 |
| 7 | SOLARTECH ENERGY SYSTEMS | 120 | 0 | 7.66 | $3.81 |
| 8 | STELLAR SOLAR | 99 | 3 | 7 | $3.94 |
| 9 | BRIGHT PLANET SOLAR | 88 | 7 | 5.81 | $4.91 |
| 10 | MILHOLLAND ELECTRIC | 67 | 0 | 7.1 | $4.83 |
| 11 | FREEDOM SOLAR POWER TX | 66 | 0 | 5.75 | $4.35 |
| 12 | SUNGEVITY | 66 | 0 | 5.89 | $4.25 |
Neighboring zips
The nearest zip markets
By distance between zip centroids
| Zip | Distance | Installs | $/W | Score |
|---|---|---|---|---|
| 92019 El Cajon | 4.7 km | 5,676 | $4.09 | 50 |
| 92021 El Cajon | 5.0 km | 6,149 | $4.26 | 43 |
| 91942 La Mesa | 5.0 km | 3,308 | $4.27 | 46 |
| 91941 La Mesa | 5.5 km | 4,820 | $4.14 | 45 |
| 92119 San Diego | 5.7 km | 3,511 | $4.19 | 46 |
| 92071 Santee | 6.5 km | 7,992 | $4.22 | 46 |
Same city
Other zips in El Cajon
Equipment
What gets installed in 92020
Share of systems with a recorded brand
Modules
LG ELECTRONICS15.1%
QCELLS NORTH AMERICA14.0%
SUNPOWER13.2%
KYOCERA SOLAR4.5%
CSI SOLAR4.5%
Inverters
ENPHASE ENERGY32.7%
SOLAREDGE30.6%
SMA AMERICA8.6%
SUNPOWER7.6%
ABB3.3%
Frequently asked
Quick answers about 92020
How many solar installations are there in 92020?
SolarDNA counts 5,062 active solar installations in El Cajon 92020, 4,924 of them residential, with data through April 23, 2026.
How much does solar cost in 92020?
The median residential system in 92020 cost $4.17 per watt over the trailing twelve months, $0.09/W below the California median.
Is solar growing in 92020?
Installations in 92020 are up 19.8%: 248 in the trailing twelve months versus 207 before.
Who installs solar in 92020?
SUNRUN, TESLA, SEMPER SOLARIS lead the 465 installers with systems in 92020. The full comp set is above.
Is 92020 a good market for solar sales?
92020 scores 54 out of 100 (Excellent, higher than 97% of U.S. zip markets).