81 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Gardner: Old Glory Solar, CR Score 62/100; 5.0★ from 30 Google reviews; open 24/7.
Best for emergencies (open 24/7): On Call Electric, posts 24/7 hours; ranked #8 of 81.
Most-reviewed: Bergeron Mechanical Systems, 521 Google reviews at 5.0★, the most of 81 ranked; ranked #26.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
81 Gardner solar installers are ranked here by CR Score, from ten published factors. 6 are open 24/7, 44 open Saturdays and 24 open Sundays, based on posted hours. The median Google rating is 4.9★ across 81 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Old Glory Solar | 62 | 5.0★ (30) | Athol, 2 mi away | 24/7 | Overall |
| 2 | Boundless, Inc. | 62 | 4.8★ (464) | Marlborough, 27 mi away | Sat · Sun | — |
| 3 | Sun Team | 57 | 4.9★ (18) | Ashburnham, 17 mi away | Sat · Sun · Evenings | — |
| 4 | Sunrun Solar | 57 | 4.1★ (239) | Shrewsbury, 27 mi away | Sat · Sun | — |
| 5 | Sunrun Solar | 56 | 4.4★ (276) | Billerica, 39 mi away | Sat · Sun | — |
| 6 | Golden Group Roofing & Solar | 56 | 4.9★ (174) | Grafton, 27 mi away | Sat · Sun | — |
| 7 | Liddell Solar | 56 | 5.0★ (27) | Clinton, 18 mi away | Sat | — |
| 8 | On Call Electric | 56 | 5.0★ (164) | Marlborough, 28 mi away | 24/7 | Emergencies |
| 9 | Momentum Solar Massachusetts | 56 | 4.0★ (198) | Marlborough, 28 mi away | Sat · Sun · Evenings | — |
| 10 | Intelligent Solar | 55 | 5.0★ (44) | Ashburnham, 16 mi away | — | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 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: 5.0★ from 30 Google reviews, listed on Google as “Solar energy company”.
Based in Marlborough, 27 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 in Ashburnham, 17 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 in Shrewsbury, 27 mi away
Ranked #4 because of its Google rating and trade focus: 4.1★ from 239 Google reviews, listed on Google as “Solar energy company”.
Based in Billerica, 39 mi away
Ranked #5 because of its Google rating and trade focus: 4.4★ from 276 Google reviews, listed on Google as “Solar energy company”.
Based in Grafton, 27 mi away
Ranked #6 because of its Google rating and review volume: 4.9★ from 174 Google reviews.
Based in Clinton, 18 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Solar energy company”.
Based in Marlborough, 28 mi away
Ranked #8 because of its Google rating and review volume: 5.0★ from 164 Google reviews.
Based in Marlborough, 28 mi away
Ranked #9 because of its Google rating and trade focus: 4.0★ from 198 Google reviews, listed on Google as “Solar energy company”.
Based in Ashburnham, 16 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 44 Google reviews, listed on Google as “Solar energy company”.
Based in Worcester, 23 mi away
Ranked #11 because of its Google rating and trade focus: 4.7★ from 100 Google reviews, listed on Google as “Solar energy company”.
Based in Sterling, 14 mi away
Ranked #12 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Solar energy system service”.
Based in Marlborough, 28 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 100 Google reviews, listed on Google as “Solar energy company”.
Based in Grafton, 37 mi away
Ranked #14 because of its Google rating and trade focus: 4.9★ from 35 Google reviews, listed on Google as “Solar energy company”.
Based in Easthampton, 40 mi away
Ranked #15 because of its Google rating and trade focus: 4.9★ from 201 Google reviews, listed on Google as “Solar energy system service”.
Based in Leominster, 13 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Solar energy company”.
Based in Amherst, 35 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 94 Google reviews, listed on Google as “Solar energy company”.
Based in Amherst, 34 mi away
Ranked #18 because of its Google rating and trade focus: 4.8★ from 115 Google reviews, listed on Google as “Solar energy company”.
Based in Hudson, 26 mi away
Ranked #19 because of its Google rating and review volume: 5.0★ from 105 Google reviews.
Based in Ludlow, 37 mi away
Ranked #20 because of its Google rating and trade focus: 4.5★ from 96 Google reviews, listed on Google as “Solar energy company”.
Based in Greenfield, 31 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 70 Google reviews, listed on Google as “Solar energy company”.
Based in Milford, 27 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Solar energy company”.
Based in Londonderry, 38 mi away
Ranked #23 because of its Google rating and trade focus: 4.4★ from 27 Google reviews, listed on Google as “Solar energy company”.
Based in Northampton, 33 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Solar energy company”.
Based in Chelmsford, 35 mi away
Ranked #25 because of its Google rating and trade focus: 4.7★ from 82 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 81 ranked solar installers here; the rest are on their profiles.
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 |
|---|---|---|
| Alex Valley Electrician | 5.0★ (2) | 8 mi |
| Brattleboro Solar Management | 5.0★ (1) | 34 mi |
| Careful Solar | 17 mi | |
| Edison Energy Consultants LLC | 5.0★ (2) | 16 mi |
| Energy Saver Enablers, LLC | 5.0★ (1) | 16 mi |
| Focus Electrical Solar Dracut MA | 5.0★ (1) | 35 mi |
| iSP (Ion Solar Pros) | 5.0★ (2) | 35 mi |
| Luminous Energy | 5.0★ (1) | 40 mi |
| New Leaf Energy | 1.0★ (1) | 33 mi |
| Onlysolar Diagnostic | 5.0★ (1) | 21 mi |
| Relay Power | 4.0★ (2) | 26 mi |
| Spartan Solar | 5.0★ (2) | 20 mi |
| Spartan Solar | 5.0★ (1) | 31 mi |
| Summit Energy | 1.0★ (1) | 35 mi |
| Sun Diagnostics Company | 5.0★ (2) | 29 mi |
| SunRun Inc | 5.0★ (1) | 27 mi |
| Vikram Solar US Inc. | 5.0★ (1) | 28 mi |
| Vivint Solar Panel Free Solar Power Solar Company System | 1.0★ (1) | 34 mi |
| Woodford Electric, Inc | 5.0★ (21) | In Gardner |
| Zahns Energy | 21 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 81 Gardner solar installers on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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 Gardner data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |