Guatay, CA 91931 solar market data
Updated April 9, 2026Provisional score · under 500 installs By The SolarDNA Data Team
Guatay 91931 has 17 solar installations at a median installed cost of $4.44/W, recent growth not yet measurable, and a Market Score of 38 — higher than 19% of U.S. zip markets.
Versus California
How 91931 compares with the state
Installed cost
$0.18/W above
state median $4.26/W
Market score
38 vs 53
California scores 53
Share of state installs
0.00%
of 2.3M tracked statewide
Battery attach
11.8%
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
Growth & pricing
91931 by year
2 installs in the trailing twelve months vs 0 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 91931
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | ACTION SOLAR | 2 | 0 | 5.92 | $6.69 |
| 2 | SUNRUN | 2 | 0 | 12.04 | $6.09 |
| 3 | ALTERNATIVE ENERGY APPLICATIONS | 1 | 1 | 17.83 | $2.80 |
| 4 | SEMPER SOLARIS CONSTRUCTION | 1 | 1 | 5.97 | $7.62 |
| 5 | BAKER ELECTRIC SOLAR | 1 | 0 | 12.32 | $9.13 |
| 6 | CGS ENERGY CONSULTANTS | 1 | 0 | 5.54 | $3.35 |
| 7 | CURRENT SOLAR CONTRACTING | 1 | 0 | 6.48 | $3.86 |
| 8 | HEAVENLY OAKS RESIDENTIAL COMMUNITY | 1 | 0 | 12.85 | $1.93 |
| 9 | NEW DAY SOLAR | 1 | 0 | 7.92 | $2.99 |
| 10 | PRECIS SOLAR | 1 | 0 | 5.5 | — |
| 11 | SOLAR WEST | 1 | 0 | 6.9 | $6.01 |
| 12 | SOLARTECH ENERGY SYSTEMS | 1 | 0 | 4.57 | $4.77 |
Equipment
What gets installed in 91931
Share of systems with a recorded brand
Modules
QCELLS NORTH AMERICA18.8%
SILFAB SOLAR18.8%
SANYO ELECTRIC OF PANASONIC GROUP12.5%
SUNPOWER12.5%
ASTRONERGY SOLARMODULE6.3%
Inverters
ENPHASE ENERGY47.1%
SUNPOWER11.8%
DELTA ELECTRONICS5.9%
ENPHASEENERGYINC5.9%
GENERAC POWER SYSTEMS5.9%
Frequently asked
Quick answers about 91931
How many solar installations are there in 91931?
SolarDNA counts 17 active solar installations in Guatay 91931, 15 of them residential, with data through April 9, 2026.
How much does solar cost in 91931?
The median residential system in 91931 cost $4.44 per watt over the trailing twelve months, $0.18/W above the California median.
Is solar growing in 91931?
Recent growth cannot be measured yet for 91931: too few recent installs (data runs through April 9, 2026).
Who installs solar in 91931?
ACTION SOLAR, SUNRUN, ALTERNATIVE ENERGY APPLICATIONS lead the 14 installers with systems in 91931. The full comp set is above.
Is 91931 a good market for solar sales?
91931 scores 38 out of 100 (Fair, higher than 19% of U.S. zip markets). With under 500 installations the score is provisional.