Long Island · Tier 3 coverage
Nassau County solar, storage, and backup power
Mineola is the county seat. 1,395,774 people, served primarily by PSEG-LI, with 1 other utility serving parts of the county. Everything below is built on public data with the source and date attached.
This county is served by more than one utility, and it matters
PSEG-LI, Municipal utility all serve pieces of Nassau County. Which one is on your bill decides your rate, your fixed monthly charge, your Customer Benefit Contribution, and which interconnection process you go through. Two houses ten miles apart can face materially different solar economics for reasons that have nothing to do with the sun.
Some communities here run municipal electric systems. NY-Sun incentives generally do not apply to municipal customers, and New York's net-metering statute does not bind those utilities. If your bill comes from your village rather than from a big utility, most solar advice you will read does not apply to you.
County facts
Nassau County at a glance
Primary utility
PSEG-LI
Also served by Municipal utility.
Primary climate zone
Long Island
1,220–1,360 kWh per kW-DC per year; 20–45" of snow.
Modeled NREL PVWatts v8 · verified Jan 2026
Design ground snow load
20–30 psf
What racking here has to be engineered for.
Filed ASCE 7 ground snow load data · verified Jan 2026Snow load is low here, but wind load requirements are the highest in the state and drive the racking spec instead.
Median home value
$610,000
Context for whether a 25-year financed system is proportionate to the asset.
Modeled U.S. Census American Community Survey 5-year estimates · verified Jan 2026ACS 5-year estimate, rounded to the nearest $5,000.
Median household income
$130,000
Relevant to EmPower+ and income-eligible program screening.
Modeled U.S. Census American Community Survey 5-year estimates · verified Jan 2026ACS 5-year estimate, rounded to the nearest $5,000.
Local reality
What is specific to Nassau County
- PSEG Long Island operates under LIPA's tariff, not the Public Service Commission's. Statewide net-metering and CBC guidance you read elsewhere does not automatically apply here.
- Freeport and Rockville Centre run their own municipal electric systems inside otherwise PSEG-LI territory, with their own rates and their own net-metering policies.
- The most saturated residential solar market in New York. Quote-to-quote spread on identical hardware is the widest in the state, which means shopping is worth more here than anywhere.
Geography that shapes it: Jones Beach, the Nassau Coliseum, the North Shore Gold Coast.
Taxes and permits
The three local rules that change your numbers
| Rule | Status here | What to do about it |
|---|---|---|
| Property tax exemption (RPTL 487) | Check your town | New York's RPTL § 487 gives solar a 15-year exemption from the property-tax increase the system would otherwise cause. Counties, towns, cities, villages, and school districts each opt out separately, so a single address can be exempt from one taxing jurisdiction and not another. Ask your town assessor which of your four taxing bodies have opted out before you let anyone put a property-tax number in a savings projection. |
| Sales tax on residential solar | Exempt | Residential solar equipment and installation are exempt from New York's 4% state sales tax under Tax Law § 1115. The local county portion is exempt only where the county has elected it, and most upstate counties have. Check that your quote is not charging you sales tax it should not be. |
| Permitting | Varies by municipality | Permits are issued by your town, city, or village — not the county. Timelines and fees vary block to block across a single county. The NYS Unified Solar Permit is broadly adopted in this area, which shortens review where it is used. |
Town by town
2 places in Nassau County
Go deeper
Utilities and climate for this county
- Nassau County weather and solarLong Island seasonal production curve, snow load, and the roof consequences.
- PSEG Long Island rates and rulesNassau County, Suffolk County, and the Rockaways.
- Municipal Electric Systems rates and rulesNew York has 47 municipal electric systems — village and city departments that buy low-cost hydropower from the New York Power Authority and distribute it themselves.
The 30% federal solar tax credit is gone for direct purchases.
Section 25D — the Residential Clean Energy Credit — terminated for expenditures after December 31, 2025 under Public Law 119-21. If you did not have a system installed and operational by the end of 2025, it is not available to you. Signing a contract or paying a deposit in 2025 was not enough.
Third-party ownership (a lease or a PPA) can still access the 48E business credit through the statutory window, but that credit is claimed by the system owner, not by you. Whether any of it reaches your monthly payment is a question for the contract, not the brochure.
New York's own credit is unaffected: Form IT-255 still gives 25% of qualified solar equipment cost, capped at $5,000 lifetime, with a five-year carryforward.
If a proposal still shows a 30% federal credit, ask the salesperson to point you to the IRS guidance that allows it. There is not any. Current program status →
Nearby counties
Other Long Island counties
How this page is built
This is a generated page: the structure is shared across locations, the numbers are not. Every figure comes from the source cited beside it, with the date we last checked it. Nothing here is a quote, an appraisal, or tax advice, and none of it is specific to your roof.
Rates and incentive programs change. We re-verify utility tariffs and NYSERDA program status on a rolling schedule and stamp the date on each number rather than on the page, so you can see which specific figures are fresh. Full methodology · Program status tracker · About the Local Energy Playbook
Page content last reviewed April 2026.