Altadena, CA 91001 solar market data
Updated May 4, 2026 By The SolarDNA Data Team
Altadena 91001 has 2,028 solar installations at a median installed cost of $4.38/W, installations down 16.1% over the trailing twelve months, and a Market Score of 44 — higher than 63% of U.S. zip markets.
Versus California
How 91001 compares with the state
Installed cost
$0.11/W above
state median $4.26/W
Market score
44 vs 53
California scores 53
Share of state installs
0.09%
of 2.3M tracked statewide
Battery attach
20.7%
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: 82–100 installs (midpoint 91)
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
91001 by year
99 installs in the trailing twelve months vs 118 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in 91001
Ranked by systems recorded in this zip
| # | Installer | Installs | 12-mo | Avg kW | $/W |
|---|---|---|---|---|---|
| 1 | TESLA | 204 | 3 | 6.5 | $5.09 |
| 2 | SUNRUN | 173 | 11 | 6.34 | $4.58 |
| 3 | ALTADENA SOLAR | 168 | 0 | 7.97 | $3.58 |
| 4 | SUNPOWER | 135 | 0 | 7.11 | $4.81 |
| 5 | SOLAR OPTIMUM DESIGN ELECTRIC | 68 | 0 | 8.79 | $2.90 |
| 6 | CLEAN INITIATIVE | 41 | 0 | 5.94 | $4.73 |
| 7 | SUNGEVITY | 41 | 0 | 5.34 | $4.11 |
| 8 | VERENGO | 40 | 0 | 6.11 | $4.48 |
| 9 | SUNERGY CONSTRUCTION | 33 | 0 | 6.26 | $3.37 |
| 10 | SMART ENERGY USA | 27 | 0 | 6.74 | $1.44 |
| 11 | AMECO SOLAR | 25 | 3 | 7.66 | $3.61 |
| 12 | SEMPER SOLARIS | 24 | 0 | 8.09 | $4.53 |
Equipment
What gets installed in 91001
Share of systems with a recorded brand
Modules
QCELLS NORTH AMERICA14.6%
SUNPOWER12.5%
REC GROUP7.5%
LG ELECTRONICS6.0%
CSI SOLAR5.8%
Inverters
ENPHASE ENERGY35.2%
SOLAREDGE31.9%
SUNPOWER8.7%
SMA AMERICA5.8%
POWER-ONE4.4%
Frequently asked
Quick answers about 91001
How many solar installations are there in 91001?
SolarDNA counts 2,028 active solar installations in Altadena 91001, 2,018 of them residential, with data through May 4, 2026.
How much does solar cost in 91001?
The median residential system in 91001 cost $4.38 per watt over the trailing twelve months, $0.11/W above the California median.
Is solar growing in 91001?
Installations in 91001 are down 16.1%: 99 in the trailing twelve months versus 118 before.
Who installs solar in 91001?
TESLA, SUNRUN, ALTADENA SOLAR lead the 355 installers with systems in 91001. The full comp set is above.
Is 91001 a good market for solar sales?
91001 scores 44 out of 100 (Good, higher than 63% of U.S. zip markets).