La Mesa, CA 91942 solar market data
Updated April 21, 2026 By The SolarDNA Data Team
La Mesa 91942 has 3,308 solar installations at a median installed cost of $4.27/W, installations down 9.9% over the trailing twelve months, and a Market Score of 46 — higher than 72% of U.S. zip markets.
Versus California
How 91942 compares with the state
Installed cost
$0.01/W above
state median $4.26/W
Market score
46 vs 53
California scores 53
Share of state installs
0.15%
of 2.3M tracked statewide
Battery attach
5.1%
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: 125–153 installs (midpoint 139)
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
91942 by year
146 installs in the trailing twelve months vs 162 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 91942
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 489 | 37 | 5.18 | $4.64 |
| 2 | TESLA | 202 | 2 | 5.59 | $5.12 |
| 3 | SEMPER SOLARIS | 175 | 0 | 5.38 | $3.97 |
| 4 | BAKER ELECTRIC SOLAR | 166 | 0 | 14.96 | $4.29 |
| 5 | BRIGHT PLANET SOLAR | 104 | 4 | 4.74 | $4.79 |
| 6 | SULLIVAN SOLAR POWER | 89 | 0 | 6.6 | $4.42 |
| 7 | SOLARTECH ENERGY SYSTEMS | 87 | 0 | 6.02 | $3.90 |
| 8 | STELLAR SOLAR | 86 | 4 | 6.35 | $4.25 |
| 9 | SUNLINE ENERGY | 69 | 1 | 5.52 | $3.87 |
| 10 | SUNPOWER | 59 | 0 | 19.73 | $4.85 |
| 11 | FREEDOM SOLAR POWER TX | 49 | 0 | 5.12 | $4.15 |
| 12 | ASI HEATING AIR | 47 | 0 | 5.04 | $3.85 |
Neighboring zips
The nearest zip markets
By distance between zip centroids
| Zip | Distance | Installs | $/W | Score |
|---|---|---|---|---|
| 92119 San Diego | 2.3 km | 3,511 | $4.19 | 46 |
| 91941 La Mesa | 2.7 km | 4,820 | $4.14 | 45 |
| 92020 El Cajon | 5.0 km | 5,062 | $4.17 | 54 |
| 92120 San Diego | 5.0 km | 4,516 | $4.11 | 48 |
| 92115 San Diego | 5.6 km | 3,794 | $4.30 | 44 |
| 91945 Lemon Grove | 5.7 km | 2,658 | $4.49 | 40 |
Same city
Other zips in La Mesa
Equipment
What gets installed in 91942
Share of systems with a recorded brand
Modules
QCELLS NORTH AMERICA16.8%
LG ELECTRONICS12.4%
SUNPOWER11.3%
CSI SOLAR5.2%
LONGI GREEN ENERGY TECHNOLOGY5.1%
Inverters
ENPHASE ENERGY37.5%
SOLAREDGE33.7%
SUNPOWER6.3%
SMA AMERICA5.6%
TESLAINC2.7%
Frequently asked
Quick answers about 91942
How many solar installations are there in 91942?
SolarDNA counts 3,308 active solar installations in La Mesa 91942, 3,238 of them residential, with data through April 21, 2026.
How much does solar cost in 91942?
The median residential system in 91942 cost $4.27 per watt over the trailing twelve months, $0.01/W above the California median.
Is solar growing in 91942?
Installations in 91942 are down 9.9%: 146 in the trailing twelve months versus 162 before.
Who installs solar in 91942?
SUNRUN, TESLA, SEMPER SOLARIS lead the 402 installers with systems in 91942. The full comp set is above.
Is 91942 a good market for solar sales?
91942 scores 46 out of 100 (Great, higher than 72% of U.S. zip markets).