San Marcos, CA solar installation & market data
Updated April 17, 2026 By The SolarDNA Data Team
San Marcos has 11,962 solar installations across 3 zip codes at a median installed cost of $4.17/W, installations up 32.3% over the trailing twelve months, and an installs-weighted Market Score of 56.
Active installations
11,962
Zip markets
3
Median cost
$4.17/W
12-mo growth
▲ 32.3%
Installers active
578
City Market Score
Excellent · installs-weighted across 3 zips
Best zip in San Marcos scores higher than 99% of U.S. zip markets.
Versus California
How San Marcos compares with the state
Installed cost
$0.09/W below
state median $4.26/W
Market score
56 vs 53
California scores 53
Share of state installs
0.53%
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: 545–737 installs (midpoint 641)
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
San Marcos by year
557 installs in the trailing twelve months vs 421 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in San Marcos
Summed across every zip in the city
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | SUNRUN | 1,832 | 188 | 2 | $4.44 |
| 2 | BAKER ELECTRIC SOLAR | 1,165 | 0 | 2 | $4.14 |
| 3 | TESLA | 1,052 | 11 | 2 | $5.03 |
| 4 | SUNPOWER | 874 | 9 | 2 | $4.23 |
| 5 | SEMPER SOLARIS | 457 | 0 | 2 | $3.98 |
| 6 | SUNSTREET ENERGY GROUP | 411 | 0 | 2 | $3.80 |
| 7 | STELLAR SOLAR | 276 | 7 | 2 | $3.96 |
| 8 | HOME ENERGY SYSTEMS | 227 | 0 | 2 | $2.67 |
| 9 | SUNLINE ENERGY | 189 | 9 | 2 | $3.63 |
| 10 | BRIGHT PLANET SOLAR | 183 | 13 | 2 | $4.53 |
| 11 | SUNGEVITY | 170 | 0 | 2 | $3.98 |
| 12 | SULLIVAN SOLAR POWER | 151 | 0 | 2 | $4.23 |
| 13 | CARLSON SOLAR ENERGY | 150 | 0 | 2 | $6.90 |
| 14 | SOLARTECH ENERGY SYSTEMS | 135 | 0 | 2 | $3.76 |
| 15 | FREEDOM SOLAR POWER TX | 133 | 0 | 2 | $3.95 |
| 16 | GAF ENERGY | 110 | 95 | 1 | $7.20 |
| 17 | COMPLETE SOLAR | 104 | 0 | 2 | $4.16 |
| 18 | INFINITY ENERGY | 94 | 1 | 2 | $4.56 |
| 19 | ALIVE INDUSTRIES | 81 | 7 | 2 | $3.83 |
| 20 | PALOMAR SOLAR | 80 | 3 | 2 | $3.72 |
| 21 | COSMIC SOLAR | 80 | 4 | 2 | $3.51 |
| 22 | KOTA CONSTRUCTION | 69 | 0 | 2 | $5.14 |
| 23 | SOLAR WATT SOLUTIONS | 68 | 0 | 2 | $3.65 |
| 24 | SOLARE ENERGY | 63 | 0 | 2 | $3.69 |
| 25 | POWUR | 61 | 0 | 2 | $4.04 |