105 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Westminster: Old Glory Solar, CR Score 87/100; 5.0★ from 30 Google reviews; open 24/7.
Best for emergencies (open 24/7): NEC Electric & Solar, posts 24/7 hours; ranked #4 of 105.
Most-reviewed: Neeeco, 3,580 Google reviews at 4.9★, the most of 105 ranked; ranked #21.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
105 Westminster solar installers are ranked here by CR Score, from 8 published factors. 6 are open 24/7, 55 open Saturdays and 25 open Sundays, based on posted hours. The median Google rating is 4.9★ across 105 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Old Glory Solar | 87 | 5.0★ (30) | Athol, 7 mi away | 24/7 | Overall |
| 2 | Boundless, Inc. | 84 | 4.8★ (464) | Marlborough, 22 mi away | Sat · Sun | — |
| 3 | Sun Team | 82 | 4.9★ (18) | Ashburnham, 13 mi away | Sat · Sun · Evenings | — |
| 4 | NEC Electric & Solar | 81 | 5.0★ (115) | Needham, 39 mi away | 24/7 | Emergencies |
| 5 | HAREI | 80 | 5.0★ (4) | Milford, 27 mi away | 24/7 | — |
| 6 | Leominster Solar Solutions | 80 | 5.0★ (5) | Leominster, 9 mi away | Sat · Sun · Evenings | — |
| 7 | On Call Electric | 80 | 5.0★ (164) | Marlborough, 23 mi away | 24/7 | — |
| 8 | Golden Group Roofing & Solar | 80 | 4.9★ (174) | Grafton, 23 mi away | Sat · Sun | — |
| 9 | Mark The Solar Expert | 80 | 4.9★ (35) | Grafton, 33 mi away | Sat · Sun · Evenings | — |
| 10 | Avid Solar LLC | 79 | 4.6★ (9) | Sterling, 9 mi away | Sat · Sun | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and availability: 5.0★ from 30 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Marlborough, 22 mi away
Ranked #2 because of its Google rating and trade focus: 4.8★ from 464 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Ashburnham, 13 mi away
Ranked #3 because of its Google rating and trade focus: 4.9★ from 18 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Needham, 39 mi away
Ranked #4 because of its Google rating and availability: 5.0★ from 115 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Milford, 27 mi away
Ranked #5 because of its Google rating and availability: 5.0★ from 4 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Leominster, 9 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Marlborough, 23 mi away
Ranked #7 because of its Google rating and availability: 5.0★ from 164 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Grafton, 23 mi away
Ranked #8 because of its Google rating and availability: 4.9★ from 174 Google reviews, open 7 days a week.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Grafton, 33 mi away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 35 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sterling, 9 mi away
Ranked #10 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Solar energy system service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Billerica, 34 mi away
Ranked #11 because of its Google rating and trade focus: 4.4★ from 276 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Clinton, 13 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Shrewsbury, 22 mi away
Ranked #13 because of its Google rating and trade focus: 4.1★ from 239 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Tewksbury, 34 mi away
Ranked #14 because of its Google rating and availability: 5.0★ from 100 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Marlborough, 23 mi away
Ranked #15 because of its Google rating and trade focus: 4.0★ from 198 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Andover, 40 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Derry, 38 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 24 Google reviews, listed on Google as “Solar energy company”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Londonderry, 36 mi away
Ranked #18 because of its Google rating and trade focus: 4.4★ from 27 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Lexington, 37 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 468 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Lowell, 32 mi away
Ranked #20 because of its Google rating and availability: 4.7★ from 81 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Wilmington, 39 mi away
Ranked #21 because of its Google rating and review volume: 4.9★ from 3,580 Google reviews, the most Google reviews on this list (3,580).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Ashburnham, 11 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 44 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Methuen, 39 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 43 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hudson, 21 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 105 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Worcester, 19 mi away
Ranked #25 because of its Google rating and trade focus: 4.7★ from 100 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 105 ranked solar installers here; the rest are on their profiles.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Go Green Industries | 76 | 4.9★ (15) | 24 mi |
| 27 | ComfortMax Energy Solutions | 76 | 5.0★ (109) | 32 mi |
| 28 | Brightstar Solar | 75 | 4.9★ (100) | 24 mi |
| 29 | Boston Solar | 75 | 4.7★ (1,357) | 39 mi |
| 30 | Patriot Solar Energy, Inc | 75 | 4.5★ (8) | 33 mi |
| 31 | NE Solar Pros LLC | 75 | 5.0★ (13) | 32 mi |
| 32 | Brad the Solar Guy | 75 | 5.0★ (20) | 36 mi |
| 33 | PosiGen Home Solar | 74 | 4.5★ (96) | 39 mi |
| 34 | All Weather Exteriors LLC | 74 | 4.8★ (153) | 38 mi |
| 35 | Merrimack Solar - Affiliate of SunRun | 74 | 4.8★ (19) | 37 mi |
| 36 | New England Solar Initiative | 74 | 5.0★ (13) | 37 mi |
| 37 | PosiGen Home Solar | 74 | 4.4★ (23) | 30 mi |
| 38 | SunRite Solar | 74 | 5.0★ (20) | 21 mi |
| 39 | DeFreitas Enterprises, LLC | 73 | 4.4★ (7) | 29 mi |
| 40 | Solar Medix - Solar Maintenance | 73 | 5.0★ (26) | 24 mi |
| 41 | Culture Energy | 73 | 5.0★ (14) | 38 mi |
| 42 | Northeast Solar | 73 | 5.0★ (94) | 39 mi |
| 43 | Accept Solar | 73 | 3.7★ (9) | 39 mi |
| 44 | Golden Group Roofing & Solar | 73 | 4.9★ (85) | 35 mi |
| 45 | Sunday Energy | 73 | 4.9★ (19) | 40 mi |
| 46 | East Coast Renewable Energy, LLC | 73 | 5.0★ (19) | 23 mi |
| 47 | Future Energy Solar | 73 | 4.9★ (114) | 40 mi |
| 48 | VAALT Energy | 73 | 5.0★ (5) | 35 mi |
| 49 | Solar On Earth | 73 | 4.7★ (82) | 30 mi |
| 50 | Insight Energy Systems - Insight Solar | 73 | 4.8★ (115) | 37 mi |
20 more solar installers within 40 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| 777 Smart Solar & Cleaning | 5.0★ (2) | 37 mi |
| Alex Valley Electrician | 5.0★ (2) | 10 mi |
| Direct Energy Plan | 5.0★ (2) | 37 mi |
| Edison Energy Consultants LLC | 5.0★ (2) | 21 mi |
| Energy Saver Enablers, LLC | 5.0★ (1) | 19 mi |
| Focus Electrical Solar Dracut MA | 5.0★ (1) | 31 mi |
| iSP (Ion Solar Pros) | 5.0★ (2) | 30 mi |
| NEC Solar | 5.0★ (2) | 37 mi |
| New Leaf Energy | 1.0★ (1) | 29 mi |
| Onlysolar Diagnostic | 5.0★ (1) | 25 mi |
| Relay Power | 4.0★ (2) | 21 mi |
| Renewables Worldwide, Inc. | 5.0★ (2) | 40 mi |
| Samaritan Solar | 5.0★ (2) | 37 mi |
| Solar Rays | 5.0★ (2) | 37 mi |
| Spartan Solar | 5.0★ (2) | 25 mi |
| Summit Energy | 1.0★ (1) | 31 mi |
| Sun Diagnostics Company | 5.0★ (2) | 24 mi |
| SunRun Inc | 5.0★ (1) | 23 mi |
| Vikram Solar US Inc. | 5.0★ (1) | 24 mi |
| Vivint Solar Panel Free Solar Power Solar Company System | 1.0★ (1) | 29 mi |
Typical prices in USD, adjusted for Massachusetts with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Solar panel installation | $28,990 | $32,790 | $35,670 | Per system: about 12 kW at about $2.60 per watt, before incentives. US national range × 1.05 New England factor (2025 Cost vs. Value Report) | October 2026 |
We scored 105 Westminster solar installers on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Westminster data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |