Six vetted installers serve Connecticut in our network, and the one that deserves your roof is the one that models your RRES tariff election honestly. That single piece of paperwork is locked for 20 years, which makes tariff fluency, not star ratings, the real test in this state.
Our Top 6 Solar Companies in Connecticut
Every company below is checked against Connecticut licensing, its own published warranty terms, and real Eversource or United Illuminating interconnection experience. Nobody paid to appear, and every fact comes from the company’s own materials, verified by our team.
Aegis Solar Energy
Branford-based and installing in Connecticut since 1989, the longest local record on this list, with direct experience at both Eversource and United Illuminating. Ask exactly what the unusual lifetime production guarantee covers; it is worth the conversation.
Earthlight Technologies
The Ellington firm was recognized as a CT Green Bank Smart-E top-performing contractor, which matters directly if you plan to finance through the Green Bank’s program. Covers all of Connecticut and reaches western Massachusetts.
Green Power Energy
In its 17th year, Green Power leans cash and loan rather than lease-heavy offers, which in Connecticut means you keep your own tariff economics instead of handing them to a third-party owner.
Momentum Solar
Operating since 2009 with its own sales, installation and service crews, Momentum handles the RRES election paperwork in-house and publishes the fastest timeline in this group.
Trinity Solar
One of the country’s largest privately held residential installers, with three decades of permitting depth. Scale cuts both ways: deep experience, but ask who actually shows up on your roof.
Venture Home
The Northeast’s volume leader counts Connecticut in its nine-state core territory, with a 25-year warranty behind every install. Confirm your project team is CT-based and ask for a recent Eversource or UI interconnection reference.
Connecticut Solar Companies Compared
Company | Experience | Workmanship Warranty | Published Timeline | CT Base |
|---|---|---|---|---|
Aegis Solar Energy | Since 1989 | Lifetime production guarantee | 8-10 weeks | Branford |
Earthlight Technologies | Since 2012 | 25 years | 10-14 weeks | Ellington |
Green Power Energy | Since 2009 | 25 years | 10-14 weeks | NJ (CT licensed) |
Momentum Solar | Since 2009 | 25 years | 6-8 weeks | NJ (CT licensed) |
Trinity Solar | Since 1994 | 25 years | 8-10 weeks | NJ (CT licensed) |
Venture Home | Since 2014 | 25 years | Quoted per project | NY (CT licensed) |
Questions to Ask a Connecticut Solar Installer
Which RRES tariff are you enrolling me in, and can I see both?
Where does the Solar Energy Adjustment appear in my projection?
How will my Eversource or United Illuminating interconnection work?
What rate escalator did you use?
Are your installers employees or subcontractors?
Red Flags in a Connecticut Solar Pitch
How We Rank Solar Companies
Rankings are built from what we can verify, never from who pays us. Five weighted factors:
Frequently Asked Questions
Who are the best solar companies in Connecticut?
What does a fair Connecticut solar quote look like in 2026?
Should I choose a local Connecticut installer or a multi-state company?
Before any sales conversation, review Connecticut’s incentives, benchmark every bid against our Connecticut pricing data, and study the tariff election in our Connecticut solar guide. Ten minutes of reading now can save you from a 20-year mistake.
Sources
References & Research Sources
EcoGen America reviewed Connecticut Public Utilities Regulatory Authority program materials, Eversource and United Illuminating interconnection resources, state licensing records, installer service-area disclosures published by the companies themselves, and federal tax guidance for this article. Sources were accessed August 4, 2026, unless another publication, release, effective, or update date is listed below.
- Connecticut Public Utilities Regulatory Authority (PURA). Residential Renewable Energy Solutions Program. State regulatory resource covering the RRES tariff structures, election terms, and 20-year commitment for residential solar. Accessed August 4, 2026.
- Eversource. Connecticut Interconnection and Residential Solar Resources. Utility resource covering interconnection process and solar customer treatment in Eversource territory. Accessed August 4, 2026.
- United Illuminating (UI). Distributed Generation Interconnection Resources. Utility resource covering interconnection and solar customer treatment in UI territory. Accessed August 4, 2026.
- Connecticut Department of Consumer Protection (DCP). Contractor and Electrical Licensing Verification. State licensing resource for verifying contractor and electrical credentials. Accessed August 4, 2026.
- Aegis Solar Energy. Company Service Area and Warranty Resources. Installer-published Connecticut coverage information. Accessed August 4, 2026.
- Earthlight Technologies. Company Service Area and Warranty Resources. Installer-published coverage information. Accessed August 4, 2026.
- Green Power Energy. Company Service Area and Warranty Resources. Installer-published coverage information. Accessed August 4, 2026.
- Momentum Solar. Company Service Area and Warranty Resources. Installer-published multi-state coverage information. Accessed August 4, 2026.
- Trinity Solar. Company Service Area and Warranty Resources. Installer-published Northeast coverage information. Accessed August 4, 2026.
- Venture Home. Company Service Area and Whole-Home Solar Resources. Installer-published Northeast coverage information. Accessed August 4, 2026.
- Internal Revenue Service (IRS). FAQs for Modification of Sections 25C, 25D, 25E, 30C, 30D, 45L, 45W and 179D under Public Law 119-21. Federal guidance confirming termination of the residential clean energy credit for installations completed after December 31, 2025. Accessed August 4, 2026.
