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Great Sky Solar is a Lexington-based installer that shows up again and again on Massachusetts solar threads as the company neighbors point each other to. With 774 ratings averaging five stars on Google and a track record running from 2021 through 2026, the volume here is unusual for a home-services business — and the write-ups back it up with specifics rather than just praise. The recurring theme is handling tricky installs well. Reviewers describe panels designed around a hundred-and-forty-year-old roof, a system built around a peaky Victorian roof full of skylights and installed in under a week, and arrays sized to account for an EV purchase and mini-splits still being planned. Sales, design, and installation are all done in-house rather than handed off between subcontractors, which more than one reviewer credits for a clean, single-point-of-contact process. The company walks each customer through what one review calls a step-by-step "Solar Installation Roadmap" running through engineering, permitting, and Permission to Operate. Multiple customers have come back for a second house or a later expansion — one two-time customer used them for installs six years apart, in 2019 and 2025, and called both experiences exemplary. Reviewers who installed a few years back describe systems performing exactly as modeled, a warranty claim on a failed micro-inverter handled without a fight, and post-installation questions answered promptly. A 2022 Reddit comment describes the company as an employee-owned co-op that travels statewide for installs — a structure a few reviewers connect to feeling personally looked after rather than sold to. The one recurring caution, from a 2025 Reddit thread, is pace: the company can be slow to get a project moving, and that reviewer had to follow up more than once before things picked up — though they still recommended the company in the end. For anyone comparing solar quotes in Massachusetts, this is a company with an unusually deep and consistent record of installs that hold up years later. Confirm the timeline up front given the pace some reviewers describe, and ask about the roadmap they'll walk you through.
“I went with MA-based Great Sky Solar for my original installation and then a second time for an extension. They are great and trustworthy but sometimes can be slow. I had to follow up with them a few times to get things going but still recommend them.”
“We ended up going with Great Sky. Happy with their service.”
“Quote 3: Great Sky Solar”
“The first company is Great Sky Solar, a local solar company near me”
“Another vote for Great Sky. Got solar and Powerwalls and an EV charger through them.”
Highly recommend Great Solar. They are just fantastic. The immediate feedback on energy consumption/export reinforces that this such a good thing for the planet. Just do it with Great Solar.
We were very impressed with Great Sky's competitive quote and professional team for our roof-based residential solar project. After signing our Letter of Intent, we moved quickly through the engineering and permitting stages of the process. Unfortunately, we were not able to settle some legal details with our condominium neighbors in time for the final contract to be signed, so we had to put our plans on hold. In future, we look forward to working with Great Sky again if our situation changes.
We had an excellent experience with Great Sky Solar. I evaluated about 15 companies and contacted 9, and Great Sky stood out from the competition for their professionalism and the technical thoroughness of their proposal. They identified important constraints with our new array that other companies missed. Every person we worked with—from sales and project management to office support, removal, and installation—was professional, responsive, pleasant, and reliable. They removed our existing array before a major renovation, installed the new system after the roof was complete, handled permitting and reconnection, and finished ahead of schedule. Our system is now producing electricity and appears to be exceeding their estimated production. Great Sky did exactly what they promised, and they did it with a 'personal touch' feel where other companies felt more like high pressure sales discussions. I cannot recommend them highly enough!
Great Sky Solar did a fantastic job installing solar and a PowerWall at our home. We have a tricky situation with a peaky Victorian roof and skylights, which they deftly designed around. Installation was quick (less than a week), and everyone was professional and courteous. I appreciate that Great Sky was conservative in estimating the % of electricity demand that would be met by solar; our actual generation has exceeded their forecasts. I have recommended Great Sky to a couple of other friends who also used them and had similarly good experiences. I recommend them without hesitation.
I had a great experience working with great sky solar. They helped walk me through the available incentives and provided my home with a large solar ray and Home batteries seamlessly. Rebecca and Sam were great to work with.
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