Castaic, CA 91310 solar market data
Updated September 22, 2025Provisional score · under 500 installs By The SolarDNA Data Team
Castaic 91310 has 71 solar installations at a median installed cost of $4.50/W, recent growth not yet measurable, and a Market Score of 38 — higher than 19% of U.S. zip markets.
Versus California
How 91310 compares with the state
Installed cost
$0.24/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
4.2%
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
91310 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 91310
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | SUNPOWER | 55 | 0 | 3.74 | $4.50 |
| 2 | ADVANCED SOLAR ELECTRIC | 2 | 0 | 3.42 | $8.93 |
| 3 | VERENGO | 2 | 0 | 4.52 | $6.00 |
| 4 | GREEN CONVERGENCE | 1 | 1 | 11.96 | $7.21 |
| 5 | AMERICAN VISION SOLAR | 1 | 0 | 5.64 | $6.42 |
| 6 | ENVER SOLAR | 1 | 0 | 2.76 | — |
| 7 | GOLD MINE SOLAR | 1 | 0 | 8.82 | $4.61 |
| 8 | MOHR POWER SOLAR | 1 | 0 | 3.78 | $10.58 |
| 9 | REC SOLAR COMMERCIAL | 1 | 0 | 6.93 | $7.10 |
| 10 | SOUTHERN CALIFORNIA SOLAR ENERGY | 1 | 0 | 8.4 | $8.04 |
| 11 | SUN ENERGY GROUP | 1 | 0 | 16.12 | $2.71 |
| 12 | SUNUSO ENERGY | 1 | 0 | 4.83 | $5.00 |
Neighboring zips
The nearest zip markets
By distance between zip centroids
| Zip | Distance | Installs | $/W | Score |
|---|---|---|---|---|
| 91384 Castaic | 0.7 km | 2,504 | $4.67 | 59 |
| 91354 Valencia | 9.1 km | 4,064 | $4.35 | 47 |
| 91390 Santa Clarita | 9.2 km | 2,222 | $4.51 | 53 |
| 91355 Valencia | 11.9 km | 1,932 | $4.25 | 56 |
| 91381 Stevenson Ranch | 12.4 km | 3,298 | $4.01 | 41 |
| 91350 Santa Clarita | 12.8 km | 5,679 | $4.33 | 49 |
Same city
Other zips in Castaic
Equipment
What gets installed in 91310
Share of systems with a recorded brand
Modules
SUNPOWER84.1%
KYOCERA SOLAR4.3%
CSI SOLAR1.5%
LG ELECTRONICS1.5%
RENOGY1.5%
Inverters
SUNPOWER80.3%
ENPHASE ENERGY5.6%
POWER-ONE4.2%
FRONIUS USA2.8%
NINGBO GINLONG TECHNOLOGIES1.4%
Frequently asked
Quick answers about 91310
How many solar installations are there in 91310?
SolarDNA counts 71 active solar installations in Castaic 91310, 71 of them residential, with data through September 22, 2025.
How much does solar cost in 91310?
The median residential system in 91310 cost $4.50 per watt over the trailing twelve months, $0.24/W above the California median.
Is solar growing in 91310?
Recent growth cannot be measured yet for 91310: too few recent installs (data runs through September 22, 2025).
Who installs solar in 91310?
SUNPOWER, ADVANCED SOLAR ELECTRIC, VERENGO lead the 13 installers with systems in 91310. The full comp set is above.
Is 91310 a good market for solar sales?
91310 scores 38 out of 100 (Fair, higher than 19% of U.S. zip markets). With under 500 installations the score is provisional.