154 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Harvard: Boundless, Inc., CR Score 86/100; 4.8★ from 464 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): Team Sunshine Construction, LLC., posts 24/7 hours; ranked #2 of 154.
Most-reviewed: Neeeco, 3,580 Google reviews at 4.9★, the most of 154 ranked; ranked #23.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
154 Harvard solar installers are ranked here by CR Score, from 8 published factors. 19 are open 24/7, 95 open Saturdays and 40 open Sundays, based on posted hours. The median Google rating is 5.0★ across 154 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Boundless, Inc. | 86 | 4.8★ (464) | Marlborough, 11 mi away | Sat · Sun | Overall |
| 2 | Team Sunshine Construction, LLC. | 85 | 4.7★ (181) | Boston, 27 mi away | 24/7 | Emergencies |
| 3 | Old Glory Solar | 84 | 5.0★ (30) | Athol, 24 mi away | 24/7 | — |
| 4 | NEC Electric & Solar | 83 | 5.0★ (115) | Needham, 23 mi away | 24/7 | — |
| 5 | Sun Team | 83 | 4.9★ (18) | Ashburnham, 7 mi away | Sat · Sun · Evenings | — |
| 6 | On Call Electric | 82 | 5.0★ (164) | Marlborough, 11 mi away | 24/7 | — |
| 7 | Sunrun Solar | 82 | 4.4★ (276) | Billerica, 18 mi away | Sat · Sun | — |
| 8 | Golden Group Roofing & Solar | 81 | 4.9★ (174) | Grafton, 15 mi away | Sat · Sun | — |
| 9 | Timothy Santos Electric | 81 | 5.0★ (100) | Tewksbury, 19 mi away | 24/7 | — |
| 10 | Kind Heart Solar Solutions | 80 | 5.0★ (5) | Boston, 28 mi away | 24/7 | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and trade focus: 4.8★ from 464 Google reviews, listed on Google as “Solar energy company”.
Based in Boston, 27 mi away
Ranked #2 because of its Google rating and availability: 4.7★ from 181 Google reviews, open 24/7.
Based in Athol, 24 mi away
Ranked #3 because of its Google rating and availability: 5.0★ from 30 Google reviews, open 24/7.
Based in Needham, 23 mi away
Ranked #4 because of its Google rating and availability: 5.0★ from 115 Google reviews, open 24/7.
Based in Ashburnham, 7 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 18 Google reviews, listed on Google as “Solar energy company”.
Based in Marlborough, 11 mi away
Ranked #6 because of its Google rating and availability: 5.0★ from 164 Google reviews, open 24/7.
Based in Billerica, 18 mi away
Ranked #7 because of its Google rating and trade focus: 4.4★ from 276 Google reviews, listed on Google as “Solar energy company”.
Based in Grafton, 15 mi away
Ranked #8 because of its Google rating and availability: 4.9★ from 174 Google reviews, open 7 days a week.
Based in Tewksbury, 19 mi away
Ranked #9 because of its Google rating and availability: 5.0★ from 100 Google reviews, open 24/7.
Based in Boston, 28 mi away
Ranked #10 because of its Google rating and availability: 5.0★ from 5 Google reviews, open 24/7.
Based in Medford, 26 mi away
Ranked #11 because of its Google rating and availability: 5.0★ from 123 Google reviews, open 24/7.
Based in Leominster, 8 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Solar energy company”.
Based in Grafton, 28 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 35 Google reviews, listed on Google as “Solar energy company”.
Based in Clinton, 5 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Solar energy company”.
Based in Milford, 27 mi away
Ranked #15 because of its Google rating and availability: 5.0★ from 4 Google reviews, open 24/7.
Based in Andover, 25 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 in Lexington, 21 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 468 Google reviews, listed on Google as “Solar energy company”.
Based in Saugus, 28 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 23 Google reviews, listed on Google as “Solar energy company”.
Based in Woburn, 24 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 14 Google reviews, listed on Google as “Solar energy company”.
Based in Shrewsbury, 17 mi away
Ranked #20 because of its Google rating and trade focus: 4.1★ from 239 Google reviews, listed on Google as “Solar energy company”.
Based in Cumberland, 39 mi away
Ranked #21 because of its Google rating and availability: 4.9★ from 354 Google reviews, open 24/7.
Based in Marlborough, 13 mi away
Ranked #22 because of its Google rating and trade focus: 4.0★ from 198 Google reviews, listed on Google as “Solar energy company”.
Based in Wilmington, 23 mi away
Ranked #23 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 in Haverhill, 32 mi away
Ranked #24 because of its Google rating and availability: 5.0★ from 4 Google reviews, open 24/7.
Based in Woburn, 23 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 62 Google reviews, listed on Google as “Solar energy company”.
#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 154 ranked solar installers here; the rest are on their profiles.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Ecoflux cleaning and professional services | 79 | 4.7★ (81) | 18 mi |
| 27 | Proto Home Service Plumbing Heating & Cooling 24/7 | 79 | 5.0★ (139) | 35 mi |
| 28 | Avid Solar LLC | 79 | 4.6★ (9) | 12 mi |
| 29 | SAVKAT SOLAR | 79 | 5.0★ (24) | 30 mi |
| 30 | Ecoloop Solar Solutions | 78 | 4.9★ (125) | 33 mi |
| 31 | Go Green Industries | 78 | 4.9★ (15) | 8 mi |
| 32 | Boston Solar | 78 | 4.7★ (1,357) | 22 mi |
| 33 | Sunrun Solar | 78 | 4.4★ (27) | 27 mi |
| 34 | Solaris Renewables | 78 | 4.7★ (213) | 32 mi |
| 35 | ComfortMax Energy Solutions | 78 | 5.0★ (109) | 18 mi |
| 36 | Helios Solar Energy | 78 | 5.0★ (43) | 26 mi |
| 37 | Golden Group Roofing & Solar | 78 | 5.0★ (105) | 8 mi |
| 38 | EnergySage | 78 | 4.8★ (1,027) | 28 mi |
| 39 | Patriot Solar Energy, Inc | 77 | 4.5★ (8) | 18 mi |
| 40 | Powersol Solutions | 77 | 5.0★ (12) | 33 mi |
| 41 | Brightstar Solar | 77 | 4.9★ (100) | 11 mi |
| 42 | The Solar Guys | 77 | 5.0★ (32) | 28 mi |
| 43 | Intelligent Solar | 77 | 5.0★ (44) | 7 mi |
| 44 | Eco Boston Solar Experts | 77 | 5.0★ (9) | 27 mi |
| 45 | SunPower Corporation | 77 | 4.5★ (154) | 29 mi |
| 46 | HiCleaners | 77 | 5.0★ (112) | 27 mi |
| 47 | Water Heater Genies | 76 | 5.0★ (21) | 28 mi |
| 48 | PosiGen Home Solar | 76 | 4.4★ (23) | 16 mi |
| 49 | Arcadia Home Services | 76 | 4.9★ (23) | 28 mi |
| 50 | Proto Home Service Plumbing Heating & Cooling | 76 | 5.0★ (25) | 30 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) | 32 mi |
| Alcorn Solar Harvard | In Harvard | |
| Alex Valley Electrician | 5.0★ (2) | 25 mi |
| Bright Lite Energy | 3.0★ (2) | 25 mi |
| Direct Energy Plan | 5.0★ (2) | 32 mi |
| Go Solar | 5.0★ (2) | 30 mi |
| iSP (Ion Solar Pros) | 5.0★ (2) | 21 mi |
| LastMile Energy, LLC | 5.0★ (2) | 34 mi |
| Navisun LLC | 3.0★ (2) | 38 mi |
| NEC Solar | 5.0★ (2) | 20 mi |
| Oak Hill Electric Co. | 5.0★ (13) | In Harvard |
| Relay Power | 4.0★ (2) | 8 mi |
| Renewables Worldwide, Inc. | 5.0★ (2) | 25 mi |
| Solar By Jake | 4.5★ (2) | 34 mi |
| Solar Design Associates | In Harvard | |
| Solar Powered by Mario's | 5.0★ (2) | 37 mi |
| Solar Rays | 5.0★ (2) | 32 mi |
| Sun Diagnostics Company | 5.0★ (2) | 8 mi |
| Sun Hour Energy | 5.0★ (2) | 29 mi |
| Tesla Solar | 3.0★ (2) | 28 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 154 Harvard 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 Harvard 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 |