Best Solar Companies on Long Island
The installers worth your time across Nassau and Suffolk, ranked honestly on licensing, warranty, equipment, and track record. SolarPro Lab is the homeowner's solar company and independent advocate. We vet installers and bring you the ones we would trust, we compare options and read the contract on your side, you choose who does the work, and we never sell your information to a list of callers.
What is different about going solar on Long Island
Long Island runs on PSEG Long Island, not Con Edison, and that changes the rules. Your interconnection and the state NY-Sun program follow the Long Island region, where the per-watt incentive steps down in blocks as capacity fills, so timing affects what you get. A good Nassau or Suffolk installer knows the PSEG Long Island process and gets your paperwork in before the block changes.
On the federal side, the residential 25D credit expired December 31, 2025, so a cash or loan buyer gets no direct federal credit in 2026. The 30% is still reachable only through a prepaid lease, where the financing partner claims the commercial Section 48E credit and passes the value back as a lower prepaid price. New York also offers a state tax credit and property tax treatment that a strong local installer will walk you through.
Go deeper: the Long Island solar guide.
Region · LI
Top 5 Solar Companies in Long Island
Ranked across equipment quality, warranty terms, customer experience, and local expertise. All companies hold valid licensing for their region.
| # | Company | Rating | Warranty | Best for | Action |
|---|---|---|---|---|---|
| 1 | 4.8 | 10-year parts and labor, 25-year component-dependent | Best Overall · NYSERDA Platinum | See full review → | |
| 2 | 4.5 | 10-year, 25-year component-dependent | 20+ Years · NYSERDA Gold | See full review → | |
| 3 | 4.5 | 25-year system warranty | Maxeon Premium Specialist | See full review → | |
| 4 | 4.2 | 10-year workmanship, 25-year system | Best Multi-Region | See full review → | |
| 5 | 4.4 | 10-year workmanship | Suffolk County Specialist | See full review → |
SUNation Energy
Best Overall · NYSERDA PlatinumThe most established residential solar installer on Long Island. Founded 2003 in Ronkonkoma, NYSERDA Platinum (a status held by only five installers in all of New York State), 8,000+ Long Island installations, and Best of Long Island Solar 15 years running. If you want the safest pick on Long Island, this is it.
| Service area | All of Long Island plus Queens, Brooklyn, Staten Island |
| Workmanship warranty | 10-year parts and labor, 25-year component-dependent |
| Panels | Tier 1 (REC, Qcells, SunPower options) |
| Inverters | Enphase, SolarEdge |
| Battery storage | Tesla Powerwall, Enphase IQ Battery |
| Financing | Cash, loan, NY-Sun rebate stacking |
Pros
- NYSERDA Platinum Status (one of only 5 installers statewide)
- 8,000+ installations completed since 2003
- Voted Best of Long Island Solar 15 years in a row
- A+ BBB and 1,100+ third-party reviews
- W-2 install crews, not subcontractors
Cons
- -Premium pricing reflects scale and warranty quality
- -Peak-season scheduling can extend the install timeline
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EmPower Solar
20+ Years · NYSERDA GoldEmPower opened on Long Island in 2003, the same year as SUNation. NYSERDA Gold status for the last three consecutive years, 50 MW of distributed solar deployed, NABCEP-certified crews. Installation experience reviews are strong, but long-term service quality has more variance. Best for homeowners willing to push for clear escalation paths up front.
| Service area | Long Island and greater NYC area |
| Workmanship warranty | 10-year, 25-year component-dependent |
| Panels | Tier 1 (REC, Qcells, SunPower) |
| Inverters | Enphase, SolarEdge |
| Battery storage | Tesla Powerwall, Enphase IQ Battery |
| Financing | Cash, loan, lease, NY-Sun rebate stacking |
Pros
- Founded 2003, same year as SUNation
- NYSERDA Gold Quality Solar Installer 3+ consecutive years
- 50 megawatts of distributed solar deployed
- NABCEP-certified install crews
Cons
- -Mixed reviews on post-install service consistency
- -Some customer reports of unresolved system production issues
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GreenLogic Energy
Maxeon Premium SpecialistSouthampton-based LI installer that has installed primarily Maxeon (formerly SunPower) panels for two decades. Maxeon's 40-year panel performance warranty is the longest in residential solar. NYSERDA Gold 2023. Strong on coastal installs, where salt air and wind-load specs matter. Watch the long-term service reviews; ask about response time guarantees.
| Service area | Long Island, Southampton HQ |
| Workmanship warranty | 25-year system warranty |
| Panels | Maxeon (primary), REC, Qcells alternatives |
| Inverters | Enphase, SolarEdge |
| Battery storage | Tesla Powerwall, Enphase IQ Battery |
| Financing | Cash, loan, NY-Sun rebate stacking |
Pros
- Founded 2005, 20+ years on Long Island
- Primary Maxeon installer with the 40-year panel performance warranty
- NYSERDA Gold Quality Solar Installer (2023)
- Coastal LI install experience (salt air, wind load)
Cons
- -Some recent reviews flag long-term system service issues
- -Maxeon-primary lineup means higher equipment cost than commodity tiers
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Venture Solar
Best Multi-RegionNortheast multi-state installer covering Long Island alongside CT, NYC, NJ, and more. A+ BBB, 4.2 reviews. The lease option is the differentiator versus the LI-native top three; Venture is one of the few in the Northeast that offers it alongside cash and loan.
| Service area | Long Island, NYC, CT, plus rest of Northeast |
| Workmanship warranty | 10-year workmanship, 25-year system |
| Panels | Multiple Tier 1 brands |
| Inverters | Enphase, SolarEdge |
| Battery storage | Tesla Powerwall, Enphase IQ Battery |
| Financing | Cash, solar loan, lease |
Pros
- A+ BBB, 4.2 aggregate score
- Cash, loan, and lease all available (lease is uncommon for LI installers)
- Multi-state coverage useful for property portfolios
Cons
- -10-year workmanship shorter than SUNation or GreenLogic
- -Less LI-specialized than 20-year-tenured competitors
Want a quote from Venture Solar? We'll coordinate it for you.
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Horizon Solar
Suffolk County SpecialistNorthport-based, founded 2009. Smaller and quieter than the big-three LI installers, with concentrated Suffolk County experience. Customer reviews emphasize honesty, attention to detail, and direct ownership access. Best fit for homeowners who want to skip the corporate sales process.
| Service area | Nassau and Suffolk counties, Northport HQ |
| Workmanship warranty | 10-year workmanship |
| Panels | Tier 1 brands |
| Inverters | Enphase, SolarEdge |
| Battery storage | Tesla Powerwall, Enphase IQ Battery |
| Financing | Cash, loan |
Pros
- Founded 2009, 16+ years on Long Island
- Strong reviewer feedback on honesty, attention to detail, and direct ownership access
- Specialist in Suffolk County building codes (Huntington, Islip, surrounding towns)
Cons
- -Smaller footprint than SUNation, EmPower, or GreenLogic
- -Less national brand recognition
Want a quote from Horizon Solar? We'll coordinate it for you.
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