Altadena, CA solar installation & market data

Updated May 4, 2026 By The SolarDNA Data Team

Altadena has 2,028 solar installations across 1 zip code at a median installed cost of $4.38/W, installations down 16.1% over the trailing twelve months, and an installs-weighted Market Score of 44.

See Altadena on the map California market

Active installations

2,028

Zip markets

Median cost

$4.38/W

12-mo growth

▼ 16.1%

Installers active

City Market Score

Good · installs-weighted across 1 zips

Best zip in Altadena scores higher than 63% of U.S. zip markets.

Versus California

How Altadena 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

Altadena 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 Altadena

Summed across every zip in the city

Export CSV

#	Installer	Installs	12-mo	Zips	$/W
1	TESLA	204	3	1	$5.09
2	SUNRUN	173	11	1	$4.58
3	ALTADENA SOLAR	168	0	1	$3.58
4	SUNPOWER	135	0	1	$4.81
5	SOLAR OPTIMUM DESIGN ELECTRIC	68	0	1	$2.90
6	CLEAN INITIATIVE	41	0	1	$4.73
7	SUNGEVITY	41	0	1	$4.11
8	VERENGO	40	0	1	$4.48
9	SUNERGY CONSTRUCTION	33	0	1	$3.37
10	SMART ENERGY USA	27	0	1	$1.44
11	AMECO SOLAR	25	3	1	$3.61
12	SEMPER SOLARIS	24	0	1	$4.53

Zip markets

Zips in Altadena

Ranked by installations · click for the zip market

Zip	Installs	$/W	Score
91001	2,028	$4.38	44 C