West Covina, CA 91791 solar market data
Updated April 29, 2026 By The SolarDNA Data Team
West Covina 91791 has 1,975 solar installations at a median installed cost of $4.22/W, installations down 10.4% over the trailing twelve months, and a Market Score of 46 — higher than 72% of U.S. zip markets.
Versus California
How 91791 compares with the state
Installed cost
$0.04/W below
state median $4.26/W
Market score
46 vs 53
California scores 53
Share of state installs
0.09%
of 2.3M tracked statewide
Battery attach
17.0%
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: 88–108 installs (midpoint 98)
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
91791 by year
103 installs in the trailing twelve months vs 115 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 91791
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | TESLA | 304 | 7 | 8.86 | $5.12 |
| 2 | SUNRUN | 170 | 15 | 8.82 | $3.93 |
| 3 | SUNNOVA ENERGY | 159 | 0 | 3.32 | $3.80 |
| 4 | SUNPOWER | 80 | 0 | 7.68 | $4.50 |
| 5 | FREEDOM FOREVER | 52 | 15 | 8.21 | $3.90 |
| 6 | BRIGHT OPS | 51 | 3 | 10.13 | $3.84 |
| 7 | AMERICAN SOLAR DIRECT | 46 | 0 | 6.04 | $5.95 |
| 8 | VERENGO | 39 | 0 | 6.49 | $4.17 |
| 9 | PETERSENDEAN | 38 | 0 | 8.96 | $3.77 |
| 10 | SOLARMAX | 38 | 0 | 8.2 | $3.21 |
| 11 | ESP CONTRACTING | 37 | 0 | 7.77 | $4.02 |
| 12 | SUNGEVITY | 37 | 0 | 7.49 | $3.82 |
Neighboring zips
The nearest zip markets
By distance between zip centroids
| Zip | Distance | Installs | $/W | Score |
|---|---|---|---|---|
| 91723 Covina | 2.6 km | 856 | $4.25 | 37 |
| 91790 West Covina | 3.6 km | 1,927 | $4.25 | 47 |
| 91722 Covina | 3.6 km | 1,523 | $4.25 | 38 |
| 91793 West Covina | 3.8 km | 8 | $3.43 | 42 |
| 91792 West Covina | 4.7 km | 853 | $4.51 | 42 |
| 91724 Covina | 5.0 km | 1,483 | $4.12 | 41 |
Same city
Other zips in West Covina
Equipment
What gets installed in 91791
Share of systems with a recorded brand
Modules
QCELLS NORTH AMERICA24.4%
SUNPOWER10.4%
CSI SOLAR7.2%
KYOCERA SOLAR7.2%
LONGI GREEN ENERGY TECHNOLOGY4.5%
Inverters
ENPHASE ENERGY35.5%
SOLAREDGE29.3%
ABB8.6%
SUNPOWER7.3%
SMA AMERICA4.8%
Frequently asked
Quick answers about 91791
How many solar installations are there in 91791?
SolarDNA counts 1,975 active solar installations in West Covina 91791, 1,955 of them residential, with data through April 29, 2026.
How much does solar cost in 91791?
The median residential system in 91791 cost $4.22 per watt over the trailing twelve months, $0.04/W below the California median.
Is solar growing in 91791?
Installations in 91791 are down 10.4%: 103 in the trailing twelve months versus 115 before.
Who installs solar in 91791?
TESLA, SUNRUN, SUNNOVA ENERGY lead the 348 installers with systems in 91791. The full comp set is above.
Is 91791 a good market for solar sales?
91791 scores 46 out of 100 (Great, higher than 72% of U.S. zip markets).