63/100CR Score
Ranked #1 because of its Google rating and review volume: 4.8★ from 464 Google reviews, the most in Spencer.
- 4.8★ from 464 Google reviews
- Hours
- Mon–Sat 9 AM–6 PM · Sun 9 AM–5 PM
- Address
- 11 Apex Dr #301b, Marlborough, MA 01752
Best Solar Installers in Spencer, MA (2026)
103 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Spencer: Boundless, Inc., CR Score 63/100; 4.8★ from 464 Google reviews; open 7 days a week.
- 2
Best for emergencies (open 24/7): Old Glory Solar, posts 24/7 hours; ranked #2 of 103.
- 14
Most-reviewed: Shamrock Well and Pump LLC, 354 Google reviews at 4.9★, the most of 103 ranked after Boundless, Inc.; ranked #14.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
103 Spencer solar installers are ranked here by CR Score, from ten published factors. 7 are open 24/7, 52 open Saturdays and 23 open Sundays, based on posted hours. The median Google rating is 4.9★ across 103 rated businesses.
Most of this list also appears on the Solar installers in Worcester ranking. See Solar installers in Worcester
Top 10 solar installers in Spencer at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Boundless, Inc. | 63 | 4.8★ (464) | Marlborough, 22 mi away | Sat · Sun | Overall |
| 2 | Old Glory Solar | 59 | 5.0★ (30) | Athol, 22 mi away | 24/7 | Emergencies |
| 3 | Sunrun Solar | 59 | 4.1★ (239) | Shrewsbury, 15 mi away | Sat · Sun | — |
| 4 | All Energy Solar | 58 | 4.9★ (294) | Westfield, 39 mi away | Sat | — |
| 5 | Mark The Solar Expert | 58 | 4.9★ (35) | Grafton, 19 mi away | Sat · Sun · Evenings | — |
| 6 | Golden Group Roofing & Solar | 58 | 4.9★ (174) | Grafton, 18 mi away | Sat · Sun | — |
| 7 | Lunex Power | 58 | 4.7★ (100) | Worcester, 10 mi away | Evenings | — |
| 8 | Momentum Solar Massachusetts | 57 | 4.0★ (198) | Marlborough, 22 mi away | Sat · Sun · Evenings | — |
| 9 | Trinity Solar | 57 | 4.4★ (339) | Holyoke, 31 mi away | Sat · Evenings | — |
| 10 | On Call Electric | 56 | 5.0★ (164) | Marlborough, 23 mi away | 24/7 | — |
The 103 best solar installers in Spencer, ranked
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.
Based in Athol, 22 mi away
59/100CR ScoreRanked #2 because of its Google rating and trade focus: 5.0★ from 30 Google reviews, listed on Google as “Solar energy company”.
- 5.0★ from 30 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 140 Patriots Rd, East Templeton, MA 01438
#3 Sunrun Solar
Based in Shrewsbury, 15 mi away
59/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.1★ from 239 Google reviews, listed on Google as “Solar energy company”.
- 4.1★ from 239 Google reviews
- Hours
- Mon–Sun 8 AM–5 PM
- Address
- 240 A Cherry St, Shrewsbury, MA 01545
Based in Westfield, 39 mi away
58/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.9★ from 294 Google reviews, listed on Google as “Solar energy company”.
- 4.9★ from 294 Google reviews
- Hours
- Mon–Fri 7 AM–6 PM · Sat 8 AM–12 PM · Sun closed
- Address
- 66-D Mainline Dr, Westfield, MA 01085
Based in Grafton, 19 mi away
58/100CR ScoreRanked #5 because of its Google rating and trade focus: 4.9★ from 35 Google reviews, listed on Google as “Solar energy company”.
- 4.9★ from 35 Google reviews
- Hours
- Mon–Fri 10 AM–9 PM · Sat 10 AM–8 PM · Sun 10 AM–7 PM
Based in Grafton, 18 mi away
58/100CR ScoreRanked #6 because of its Google rating and review volume: 4.9★ from 174 Google reviews.
- 4.9★ from 174 Google reviews
- Hours
- Mon–Sun 9 AM–5 PM
- Address
- 276 Turnpike Rd Suite 223, Westborough, MA 01581
#7 Lunex Power
Based in Worcester, 10 mi away
58/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.7★ from 100 Google reviews, listed on Google as “Solar energy company”.
- 4.7★ from 100 Google reviews
- Hours
- Mon–Fri 7 AM–7 PM · Sat–Sun closed
- Address
- 95 Prescott St Suite 106, Worcester, MA 01605
Based in Marlborough, 22 mi away
57/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.0★ from 198 Google reviews, listed on Google as “Solar energy company”.
- 4.0★ from 198 Google reviews
- Hours
- Mon–Fri 8 AM–9 PM · Sat–Sun 8 AM–7 PM
- Address
- 50 D'Angelo Dr #3, Marlborough, MA 01752
Based in Holyoke, 31 mi away
57/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.4★ from 339 Google reviews, listed on Google as “Solar energy company”.
- 4.4★ from 339 Google reviews
- Hours
- Mon–Fri 9 AM–8 PM · Sat 10 AM–4 PM · Sun closed
- Address
- 4 Open Square Way #410, Holyoke, MA 01040
#10 On Call Electric
Based in Marlborough, 23 mi away
56/100CR ScoreRanked #10 because of its Google rating and review volume: 5.0★ from 164 Google reviews.
- 5.0★ from 164 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 61 Emmett St, Marlborough, MA 01752
#11 Valley Solar
Based in Easthampton, 34 mi away
56/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.9★ from 201 Google reviews, listed on Google as “Solar energy system service”.
- 4.9★ from 201 Google reviews
- Hours
- Mon–Fri 7:30 AM–5 PM · Sat–Sun closed
- Address
- 116 Pleasant St Suite 321, Easthampton, MA 01027
#12 Brightstar Solar
Based in Marlborough, 24 mi away
56/100CR ScoreRanked #12 because of its Google rating and trade focus: 4.9★ from 100 Google reviews, listed on Google as “Solar energy company”.
- 4.9★ from 100 Google reviews
- Hours
- Mon–Fri 8:30 AM–5 PM · Sat–Sun closed
- Address
- 257 Maple St #2, Marlborough, MA 01752
Based in Needham, 39 mi away
56/100CR ScoreRanked #13 because of its Google rating and review volume: 5.0★ from 115 Google reviews.
- 5.0★ from 115 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 10 Oak St Ste 7, Needham, MA 02492
Based in Cumberland, 37 mi away
56/100CR ScoreRanked #14 because of its Google rating and review volume: 4.9★ from 354 Google reviews.
- 4.9★ from 354 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 45 Industrial Rd Suite 207, Cumberland, RI 02864
Based in Ludlow, 27 mi away
55/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.5★ from 96 Google reviews, listed on Google as “Solar energy company”.
- 4.5★ from 96 Google reviews
- Hours
- Mon–Fri 9 AM–5 PM · Sat closed · Sun 8 AM–8 PM
- Address
- 280 Moody St, Ludlow, MA 01056
#16 Liddell Solar
Based in Clinton, 23 mi away
55/100CR ScoreRanked #16 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Solar energy company”.
- 5.0★ from 27 Google reviews
- Hours
- Mon–Sat 8 AM–5 PM · Sun closed
#17 Sun Team
Based in Ashburnham, 28 mi away
55/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.9★ from 18 Google reviews, listed on Google as “Solar energy company”.
- 4.9★ from 18 Google reviews
- Hours
- Mon–Sun 10 AM–7 PM
- Address
- 58 Holden Rd, Shirley, MA 01464
#18 Avid Solar LLC
Based in Sterling, 17 mi away
55/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.6★ from 9 Google reviews, listed on Google as “Solar energy system service”.
- 4.6★ from 9 Google reviews
- Hours
- Mon–Fri 8 AM–6 PM · Sat–Sun 9 AM–5 PM
- Address
- 80 Wilder Rd, Sterling, MA 01564
#19 The Solar RN™
Based in East Greenwich, 24 mi away
55/100CR ScoreRanked #19 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Solar energy company”.
- 5.0★ from 27 Google reviews
- Hours
- Mon–Fri 9 AM–6 PM · Sat 9 AM–2 PM · Sun closed
#20 Sunfinity Power
Based in Johnston, 38 mi away
55/100CR ScoreRanked #20 because of its Google rating and trade focus: 4.9★ from 65 Google reviews, listed on Google as “Solar energy company”.
- 4.9★ from 65 Google reviews
- Hours
- Mon–Sat 9 AM–9 PM · Sun closed
- Address
- 1665 Hartford Ave Unit 20, Johnston, RI 02919
#21 Northeast Solar
Based in Amherst, 34 mi away
55/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 94 Google reviews, listed on Google as “Solar energy company”.
- 5.0★ from 94 Google reviews
- Hours
- Mon–Fri 8 AM–4 PM · Sat–Sun closed
- Address
- 136 Elm St, Hatfield, MA 01038
Based in Braintree, 21 mi away
54/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 41 Google reviews, listed on Google as “Solar energy company”.
- 5.0★ from 41 Google reviews
- Hours
- Mon–Fri 8:30 AM–5 PM · Sat–Sun closed
#23 KnowSolar.com
Based in Seekonk, 25 mi away
54/100CR ScoreRanked #23 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Solar energy company”.
- 5.0★ from 20 Google reviews
- Hours
- Mon–Thu 8 AM–9 PM · Fri 8 AM–7 PM · Sat 8 AM–5 PM · Sun closed
Based in Amherst, 33 mi away
54/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.8★ from 115 Google reviews, listed on Google as “Solar energy company”.
- 4.8★ from 115 Google reviews
- Hours
- Mon–Fri 9 AM–5 PM · Sat–Sun closed
- Address
- 59C North St, Hatfield, MA 01038
Based in Hudson, 24 mi away
54/100CR ScoreRanked #25 because of its Google rating and review volume: 5.0★ from 105 Google reviews.
- 5.0★ from 105 Google reviews
- Hours
- Mon–Fri 9 AM–5 PM · Sat 9 AM–12 PM · Sun closed
- Address
- 43 Broad St # C404, Hudson, MA 01749
How much do solar installers cost in Spencer?
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 |
How we ranked Spencer solar installers
We scored 103 Spencer 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 Spencer 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 |
Solar installers in Spencer: frequently asked questions
Who is the best solar installer in Spencer?
By CR Score, the highest-ranked solar installer in Spencer, MA is Boundless, Inc. with a CR Score of 63/100. It has 4.8★ from 464 Google reviews. It is open 7 days a week. Old Glory Solar (#2) and Sunrun Solar (#3) follow. We ranked 103 solar installers on ten factors, last updated October 22, 2026.
Which solar installers in Spencer are open 24/7?
7 ranked solar installers in Spencer post 24/7 hours. The highest-ranked are Old Glory Solar (#2), On Call Electric (#10) and NEC Electric & Solar (#13). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which solar installers in Spencer work on weekends?
52 of 103 ranked solar installers post Saturday hours and 23 post Sunday hours. The highest-ranked open Saturdays are Boundless, Inc. (#1), Old Glory Solar (#2) and Sunrun Solar (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does solar panel installation cost in Spencer?
Solar panel installation typically costs $28,990 to $35,670, with $32,790 typical (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)). The range is adjusted for Massachusetts. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Spencer solar installers have?
The median Google rating among 103 rated solar installers in Spencer is 4.9★, with a median of 17 reviews. Boundless, Inc. has the most, 464 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank solar installers?
Each solar installer gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do solar installers outside Spencer count in this ranking?
Yes, if they are within 40 mi of the Spencer city center, our service radius for solar installers. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.
Can solar installers pay to rank higher on ContractorsRanked?
No. The CR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured businesses may appear above the list, labelled Featured and showing their honest rank.
Update log for Spencer
- October 2026: CR Scores recalculated for 103 solar installers serving Spencer.
- October 2026: 1 duplicate listing merged.
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