Terawatt Solar manages solar projects from site assessment through final inspection and utility connection, emphasizing tidy installations and steady communication.
Projects are managed end-to-end with clear timelines and updates. Reviewers frequently note responsive follow-up, tidy job sites, and efficient inspections. Systems are designed with reliable components and configured for straightforward monitoring and maintenance.
Markham-based with projects across the Greater Toronto Area and Ontario.
Services include solar PV system design, roof and ground-mount installations, inverter and monitoring setup, electrical upgrades related to solar, interconnection applications, and assistance with available Ontario and federal incentives.
Reviews consistently mention responsive customer service, clear updates during rebate and utility approval steps, and neat, professional installations. Several customers describe smooth or fast inspections and reliable system performance after commissioning. Communication from the team, including follow-ups from the owner, is a recurring theme. A few reviews also note timely troubleshooting support after installation.
From my first contact with Terawatt to the completion of the installation, my experience was very positive. We had our panels installed during the beginning of the rebate program. Terawatt kept us informed of the status of our rebate request and did everything to ensure we met the criteria with both the Greener Homes initiative as well as Hydro One. The installation of excellent and the panels and converter have been flawless since being installed.
Excellent Customer Service & Outstanding Solar ExpertiseI had an amazing experience with this company for both the installation and ongoing service of my solar panels. Their customer service is exceptional—very responsive, attentive, and truly dedicated to taking care of their customers. Every time I reached out, they replied quickly and made sure my concerns were fully addressed.The owner himself even followed up with a thoughtful message, which really shows how much they value their customers. It’s rare to find a company that combines professionalism, technical expertise, and genuine care, but they truly deliver on all fronts.Highly recommended to anyone considering solar panels. A dependable team you can trust!
They installed my system in a very professional manor. I have been a building contractor for over fourty years and must say I appreciate the quality of workmanship. Cosmin was a pleasure to deal with!
I had a 10.24 kWp SolarEdge system installed by Terawatt Solar in June 2025 and the whole experience was excellent.When the ESA inspector came to check the system, he was done in under 5 minutes. I’ve worked in the electrical industry for years and I’ve never seen an inspection go that fast. He told me Terawatt is one of only two companies where inspections are always that smooth because their wiring is clean, their layouts are consistent, and they send in super detailed photos and drawings. That gave me a lot of confidence in the quality of the work.Cosmin and his crew were awesome. They handled everything from permits and design to engineering. The install itself was finished in one day. Totally turnkey, no headaches at all.Their pricing was better than any other quote I received, and the components are solid. The only recommendation I’d make is to pay the small additional cost upfront for consumption monitoring. Since I had already upgraded my inverter, the extra cost for monitoring was minimal, and it’s absolutely worth it. It lets you see how much energy you produce, how much your household consumes, and what you send back to the grid.Overall, I couldn’t be happier. Cosmin and his team made the process simple and stress-free. Great value, great people, and a great install.10/10 would totally do again. Maybe even try for a bigger solar install, lol!
Cosmin and his team did a great job on my install. They were able to finish the 10kw system in about 3 days. Cosmin also helped troubleshoot some issues after the fact and even came on boxing day to try to fix the issue.
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