Williamstown, MA solar installation & market data
Updated March 23, 2022Older data · growth withheldProvisional score · under 500 installs By The SolarDNA Data Team
Williamstown has 315 solar installations across 1 zip code at a median installed cost of $3.85/W, recent growth not yet measurable, and an installs-weighted Market Score of 48.
Active installations
315
Zip markets
1
Median cost
$3.85/W
12-mo growth
—
Installers active
12
City Market Score
Great · installs-weighted across 1 zips
Best zip in Williamstown scores higher than 79% of U.S. zip markets.
Versus Massachusetts
How Williamstown compares with the state
Installed cost
$0.32/W below
state median $4.17/W
Market score
48 vs 58
Massachusetts scores 58
Share of state installs
0.22%
of 142.6K tracked statewide
Battery attach
6.0%
state 3.1%
Statewide momentum
▲ 22.8%
residential solar added in Massachusetts, 12 months through Jul 2026
Statewide market
233.7K systems
13.3% of homes · utility-reported through Jul 2026
Growth & pricing
Williamstown by year
31 installs in the trailing twelve months vs 64 before
Installations by year
Median installed cost, $/W DC by year
Installer comp set
Who installs in Williamstown
Summed across every zip in the city
| # | Installer | Installs | 12-mo | Zips | $/W |
|---|---|---|---|---|---|
| 1 | RGS ENERGY | 81 | 0 | 1 | $3.89 |
| 2 | SOLARFLAIR ENERGY | 51 | 0 | 1 | $3.02 |
| 3 | NEW ENGLAND SOLAR GREEN SOLUTIONS | 37 | 0 | 1 | $3.77 |
| 4 | TRINITY SOLAR | 35 | 0 | 1 | $3.78 |
| 5 | TESLA | 23 | 0 | 1 | $4.92 |
| 6 | BERKSHIRE PHOTOVOLTAIC SERVICES | 19 | 0 | 1 | $8.63 |
| 7 | PV SQUARED | 13 | 0 | 1 | $4.32 |
| 8 | SUNRUN | 11 | 1 | 1 | $3.46 |
| 9 | NEXAMP | 5 | 0 | 1 | $2.53 |
| 10 | SUNBUG SOLAR | 5 | 0 | 1 | $3.25 |
| 11 | PLUGPV | 4 | 0 | 1 | $4.71 |
| 12 | VALLEY SOLAR AND WATER | 3 | 1 | 1 | $4.75 |
Zip markets
Zips in Williamstown
Ranked by installations · click for the zip market
| Zip | Installs | $/W | Score |
|---|---|---|---|
| 01267 | 315 | $3.85 | 48 B |