Spring Valley, CA 91977 solar market data
Updated March 6, 2026 By The SolarDNA Data Team
Spring Valley 91977 has 6,527 solar installations at a median installed cost of $4.40/W, installations down 34.7% over the trailing twelve months, and a Market Score of 39 — higher than 32% of U.S. zip markets.
Versus California
How 91977 compares with the state
Installed cost
$0.13/W above
state median $4.26/W
Market score
39 vs 53
California scores 53
Share of state installs
0.29%
of 2.3M tracked statewide
Battery attach
6.7%
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: 156–212 installs (midpoint 184)
Trailing-12-month installs carried forward at half the observed growth rate (capped at ±30%), with a ±15% band. Not a forecast of permits or policy.
Growth & pricing
91977 by year
216 installs in the trailing twelve months vs 331 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 91977
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 1,560 | 76 | 5.29 | $4.77 |
| 2 | TESLA | 523 | 2 | 5.62 | $5.12 |
| 3 | BRIGHT PLANET SOLAR | 319 | 23 | 4.81 | $4.70 |
| 4 | SEMPER SOLARIS | 308 | 0 | 5.5 | $4.08 |
| 5 | SWELL ENERGY | 207 | 0 | 3.32 | $3.04 |
| 6 | BAKER ELECTRIC SOLAR | 171 | 0 | 7.18 | $4.15 |
| 7 | FREEDOM SOLAR POWER TX | 127 | 0 | 5.85 | $4.22 |
| 8 | SUNPOWER | 99 | 1 | 18.85 | $5.06 |
| 9 | INFINITY ENERGY | 96 | 0 | 5.68 | $4.96 |
| 10 | STELLAR SOLAR | 93 | 3 | 6.2 | $4.13 |
| 11 | SOLARTECH ENERGY SYSTEMS | 92 | 0 | 6.59 | $3.78 |
| 12 | SUNSTREET ENERGY GROUP | 92 | 0 | 4.15 | $3.82 |
Neighboring zips
The nearest zip markets
By distance between zip centroids
| Zip | Distance | Installs | $/W | Score |
|---|---|---|---|---|
| 91945 Lemon Grove | 3.4 km | 2,658 | $4.49 | 40 |
| 91978 Spring Valley | 3.7 km | 1,135 | $4.22 | 44 |
| 91941 La Mesa | 4.3 km | 4,820 | $4.14 | 45 |
| 92114 San Diego | 5.5 km | 6,575 | $4.68 | 40 |
| 92139 San Diego | 6.7 km | 3,057 | $4.56 | 43 |
| 91902 Bonita | 6.7 km | 2,810 | $4.22 | 44 |
Same city
Other zips in Spring Valley
Equipment
What gets installed in 91977
Share of systems with a recorded brand
Modules
QCELLS NORTH AMERICA22.5%
SUNPOWER8.3%
LG ELECTRONICS8.3%
LONGI GREEN ENERGY TECHNOLOGY6.9%
SILFAB SOLAR5.9%
Inverters
SOLAREDGE38.6%
ENPHASE ENERGY32.0%
SUNPOWER4.9%
SMA AMERICA4.8%
ABB4.6%
Frequently asked
Quick answers about 91977
How many solar installations are there in 91977?
SolarDNA counts 6,527 active solar installations in Spring Valley 91977, 6,482 of them residential, with data through March 6, 2026.
How much does solar cost in 91977?
The median residential system in 91977 cost $4.40 per watt over the trailing twelve months, $0.13/W above the California median.
Is solar growing in 91977?
Installations in 91977 are down 34.7%: 216 in the trailing twelve months versus 331 before.
Who installs solar in 91977?
SUNRUN, TESLA, BRIGHT PLANET SOLAR lead the 451 installers with systems in 91977. The full comp set is above.
Is 91977 a good market for solar sales?
91977 scores 39 out of 100 (Good, higher than 32% of U.S. zip markets).