Delaware’s residential solar market is small enough that three companies, each built on a completely different business model, cover most of what a homeowner will encounter: a 28-year electrical contractor, a homebuilder’s solar division, and the East Coast’s biggest family-owned installer. Which model fits you is the real Delaware question, and it is a more useful filter than any star rating.
In Delaware you choose between kinds of company, not between ten lookalike installers. CMI is the electrical contractor, Clean Energy USA is the homebuilder-backed local, Trinity is the multi-state operator. Pick the model that fits your house, then make the SREC paperwork question the tiebreaker.
Our Top 3 Solar Companies in Delaware
Each company below survives on a different foundation, which shapes how they sell, install, and service. None of this ranking is pay-to-play: the order reflects what we could verify from each company’s own published record.
CMI Solar & Electric
The electrician: your system is installed by electricians, not a subcontracted crew. CMI participates in Delaware’s Low-to-Moderate Income Solar Program, and if your house needs panel-box work, aluminum wiring remediation or a generator alongside solar, one contractor handles all of it.
Clean Energy USA
The homebuilder: its scope reads like a whole-home energy plan, rooftop solar, backup batteries, EV charging and Span smart panels, with regular interconnection filings at both Delmarva Power and the municipal DEMEC utilities. For beach-county homeowners it is usually the first local call.
Trinity Solar
The national: big-company processes and financing reach in exchange for less local intimacy than the two Delaware-based options. For homeowners who want a large balance sheet standing behind a 25-year warranty, Trinity is the strongest name active in the state.
Delaware Solar Companies Compared
Company | Business Model | Experience | Home Base | Best Fit |
|---|---|---|---|---|
CMI Solar & Electric | Electrical contractor | Since 1998 | Newark, DE | Bundled electrical work; LMI program applicants |
Clean Energy USA | Homebuilder solar division | Since 2007 | Sussex County | Beach counties, new construction, whole-home plans |
Trinity Solar | Multi-state installer | Since 1994 | NJ (DE licensed) | Warranty backed by scale; financing reach |
Who Handles Your SREC Paperwork
Delaware homeowners can earn Solar Renewable Energy Certificates through the state’s SREC procurement program, but the value depends on registration and on selling into the right procurement window. This is a paperwork game, and it is a fair test question for any installer: ask specifically who registers the system, who manages the SREC sale, and whether that service costs extra. A Delaware-focused installer should answer in one sentence.
Coverage and timelines also differ across the state’s three counties. Enter your ZIP code to see which of these companies serve your address and how their current offers compare.
See which Delaware installers serve your county
Questions to Ask a Delaware Solar Installer
Who registers my system for SRECs, and who sells them?
Which utility am I interconnecting with, and how do its rules differ?
Are your installers electricians or a subcontracted crew?
Do you participate in Delaware’s Low-to-Moderate Income Solar Program?
What does the workmanship warranty cover, and who stands behind it?
Red Flags in a Delaware 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 installs the most residential solar in Delaware?
Among Delaware-focused companies, Clean Energy USA claims the state’s largest local install base, while Trinity Solar likely leads when multi-state installers are counted. CMI Solar & Electric has the longest continuous operating history of the three as an electrical firm, dating to 1998.
Does Delaware have good solar incentives?
Delaware’s incentives center on net metering, SRECs through the state procurement program, and utility rebates that vary by provider, with Delmarva, DEMEC municipals and the co-op each running different rules. The federal homeowner purchase credit ended for systems placed in service after December 31, 2025. Our Delaware incentives guide has current details.
Should Delaware homeowners get a quote from a national installer too?
Yes, one national quote is worth having as a benchmark, and Trinity Solar is the strongest national-scale name active in Delaware. Compare it against a local quote from CMI or Clean Energy USA; the spread between the two usually tells you more than either number alone.
Before you decide, check the current programs in Delaware incentives, benchmark pricing with Delaware solar costs, and see the state overview in our Delaware solar guide.
A small state does not mean identical quotes. Enter your ZIP code and compare the installers that cover your county.
Match your Delaware home with a vetted installer
Sources
References & Research Sources
EcoGen America reviewed Delaware’s SREC procurement program materials, utility interconnection resources, and the installers’ own published claims for this article. Sources were accessed August 8, 2026, unless another publication, release, effective, or update date is listed below.
- CMI Solar & Electric. Company site: history, systems installed and programs. Accessed August 8, 2026.
- Clean Energy USA. Company site: Delaware focus, services and history. Accessed August 8, 2026.
- Trinity Solar. Company site: states served and company background. Accessed August 8, 2026.
- Delaware Department of Natural Resources and Environmental Control. SREC Delaware procurement program. Accessed August 8, 2026.
