Four vetted installers serve Long Island, and the top two have been based here for over 20 years each. The Long Island-specific truth: PSEG Long Island runs its own program rules, separate from the utilities that serve the rest of New York, and the state’s 25% tax credit still pays up to $5,000 even with the federal credit gone. The right installer here proves two things fast: a local base and recent approvals with PSEG Long Island.
Long Island is the strongest residential solar market in New York, and it is also the one place where advice written for the rest of the state quietly stops applying. The grid belongs to LIPA and is operated by PSEG Long Island, which runs its own interconnection process and its own program rules. Two of the longest-running solar companies in the Northeast are headquartered here and built their businesses on exactly that local knowledge. Here are the 4 companies that cleared our checks for Nassau and Suffolk, and what to demand from any bid.
PSEG Long Island Plays by Its Own Rulebook
- Proposals built on Con Edison assumptions do not transfer. LIPA sets Long Island’s rates and solar mechanics, PSEG Long Island administers them, and neither follows the playbook used elsewhere in New York. A serious quote names PSEG Long Island, models its current crediting terms and carries a date next to those terms.
- The New York credit is alive, the federal one is not. The state solar tax credit still returns 25% of your system cost up to a $5,000 cap, and it survived the federal residential credit’s expiry at the end of 2025. If a proposal shows a federal credit line for a 2026 install, walk away from the whole document.
- Hold quotes against $2.97 per watt. New York’s competitive installed price is $2.97 per watt before incentives, per the EcoGen Solar Cost Index, so a 7 kW system prices near $20,800 before the state credit trims it. Coastal work can justify honest adders; a fair quote names each one.
The 4 Companies That Cleared Our Long Island Checks
SUNation Energy
The benchmark for disclosure on the Island: headquartered on Remington Boulevard in Ronkonkoma, installing since 2003 with 10,000+ residential and commercial systems, and it prints its licence numbers, Suffolk 44104-H and Nassau H2409230000, right on its own site. Serves both counties plus Queens, Brooklyn and Staten Island. When a company makes checking this easy, every competitor should be held to the same bar.
EmPower Solar
A Farmingdale operation sitting right on the Nassau-Suffolk line with 20+ years on the Island and 200,000+ panels placed. Its own site backs the work with a 25-year product and workmanship warranty plus a 5-year production guarantee that pays you if the system underdelivers. Licence numbers are not printed on the site; ask for the county registrations with your quote and check them, the same standard we hold everyone to.
Venture Solar
A Northeast regional installer with New York squarely in its published coverage and a track record in incentive-heavy markets like this one. The bench depth is the draw; the homework is making it prove Long Island fluency specifically. Ask for recent PSEG Long Island approvals, not New York ones, before treating the regional record as local.
Momentum Solar
A national-scale installer that keeps installation in-house across ten states including New York. On Long Island the two questions for any non-local are the same: show me your last PSEG Long Island interconnection, and name who services this roof in year 6. Get both answers in writing and the scale works for you rather than against you.
Nassau to Montauk: The Shortlist at a Glance
Installer | Home base | Verified strength | Make them show you |
|---|---|---|---|
SUNation Energy | Ronkonkoma, NY | Both county licences published | Current program terms, dated |
EmPower Solar | Farmingdale, NY | 25-yr warranty + production guarantee | County licence numbers |
Venture Solar | Northeast regional | 9-state coverage | Recent PSEG LI approvals |
Momentum Solar | National, NY operations | In-house crews | Year-6 service plan, written |
Your rate plan, the current program terms and the honest price band can all be confirmed before a salesperson reaches your kitchen table. Enter your ZIP code and start from the verified facts.
See what solar really costs at your Long Island address
Reading a Quote for a House Near the Water
Five Things to Confirm Before You Sign on Long Island
Which crediting terms did you model, and as of what date?
Show me your three most recent PSEG Long Island approvals.
What is my price per watt before incentives?
What are your Suffolk and Nassau licence numbers?
How is the state tax credit shown in my proposal?
How We Rank Solar Companies
Rankings are built from what we can verify, never from who pays us. For Long Island, five weighted factors:
Frequently Asked Questions
SUNation Energy, EmPower Solar, Venture Solar and Momentum Solar make up our vetted Long Island network for 2026. The top two are Island-based: SUNation in Ronkonkoma with 10,000+ installations since 2003, and EmPower in Farmingdale with 200,000+ panels placed over 20+ years.
New York’s competitive installed price is $2.97 per watt before incentives, per the EcoGen Solar Cost Index, so a 7 kW system prices near $20,800 before the state tax credit returns up to $5,000. Coastal hardware requirements can add named line items on top.
Yes. The New York state credit returns 25% of your system cost up to a $5,000 cap and was unaffected by the federal residential credit’s expiry at the end of 2025. Any 2026 proposal still showing a federal credit line was not prepared honestly.
PSEG Long Island administers the Island’s grid for LIPA and credits exported solar power under its own locally set terms, which differ from the rules elsewhere in New York. The only version that matters is the current one, named and dated inside your proposal.
Yes. SUNation is headquartered in Ronkonkoma in central Suffolk and has installed since 2003, publishing its Suffolk and Nassau licence numbers on its own site. EmPower Solar operates from Farmingdale on the Nassau-Suffolk line with 20+ years on the Island.
Comparing across the state line too? Our New York company rankings hold the statewide field, and the New York cost guide walks through the price math behind this page.
Two decades of local track record beats any doorstep pitch. Enter your ZIP code and compare the installers we verified.
Compare the vetted Long Island installers
Sources
References & Research Sources
EcoGen America reviewed PSEG Long Island solar and interconnection resources, Long Island Power Authority program materials, New York State tax credit guidance, Suffolk County and Nassau County contractor licensing resources, installer base, licence, warranty and coverage disclosures published by the companies themselves, and federal tax guidance for this article. Sources were accessed August 13, 2026, unless another date is listed below.
- PSEG Long Island. Solar Energy and Interconnection Resources. Utility program materials for LIPA’s service territory. Accessed August 13, 2026.
- Long Island Power Authority (LIPA). Tariff and Program Materials. The authority setting Long Island’s rates and solar mechanics. Accessed August 13, 2026.
- New York State Department of Taxation and Finance. Solar Energy System Equipment Credit. State guidance on the 25% credit and its $5,000 cap. Accessed August 13, 2026.
- Suffolk County Department of Labor, Licensing and Consumer Affairs. Home Improvement Licensing Resources. County contractor licensing. Accessed August 13, 2026.
- Nassau County Office of Consumer Affairs. Home Improvement Licensing Resources. County contractor licensing. Accessed August 13, 2026.
- SUNation Energy. Company Base, Installation Count and Licence Disclosures. Installer-published information, including Suffolk licence 44104-H and Nassau licence H2409230000. Accessed August 13, 2026.
- EmPower Solar. Company Base, Warranty and Service Area Resources. Installer-published information. Accessed August 13, 2026.
- Venture Solar. Company Coverage Resources. Installer-published Northeast coverage information. Accessed August 13, 2026.
- Momentum Solar. Company Service Area Resources. Installer-published multi-state coverage information. Accessed August 13, 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 13, 2026.
