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New York Energy Resource Bureau
An independent homeowner guide to NY energy incentives
Source quality: Secondary

Nassau County

County or city: Nassau County, NY Utility territory: PSEG Long Island for electric (countywide); National Grid for natural gas in most service areas (legacy KeySpan footprint) Verified: May 27, 2026 Source quality: Secondary

What programs apply here

Every Nassau County homeowner has access to the same statewide programs as the rest of New York. The utility layer is simpler than most New York counties: a single electric provider (PSEG Long Island) covers the entire county, and gas service is almost entirely National Grid. At a Nassau address you can apply for:

  • NY-Sun: the state's upfront solar incentive.
  • NY-Sun Community Solar: subscription-based solar bill credits for renters and homeowners without suitable roofs.
  • NY State Solar Tax Credit: the 25% state income tax credit on residential solar.
  • NY State Geothermal Credit: the 25% state credit for ground-source heat pump installs.
  • NYS Clean Heat: heat pump rebates, delivered on Long Island through PSEG LI.
  • Comfort Home: flat per-measure incentives for insulation and air sealing.
  • EmPower+: no-cost or low-cost upgrades for income-eligible households, and the intake path for the federal HEAR rebate.
  • PSEG Long Island Rebates: heat pump water heaters, smart thermostats, geothermal, and a free home energy assessment.
  • National Grid Rebates: the gas-side equipment rebates for the National Grid Long Island footprint.
  • Solar for All: income-qualified community solar with no enrollment fee.

What stacks at this address

The cleanest stacks for a Nassau homeowner:

  • Geothermal: PSEG LI tier + state geothermal credit. A ground-source install in Hempstead, Garden City, or anywhere else in Nassau pulls a PSEG Long Island rebate tied to your income tier, then a separate 25% state credit on the post-rebate cost. The PSEG Long Island Rebates page documents the per-dwelling caps and the low-income tier; do not estimate amounts from a contractor's worksheet without checking the program page.
  • Envelope first, then equipment. Sequence Comfort Home insulation and air sealing before sizing a heat pump or geothermal loop. A tighter envelope on a 1950s Levittown cape or a postwar split level often drops the heat-load enough to step down a ton of capacity.
  • PSEG LI thermostat + Comfort Home + Clean Heat. The PSEG LI smart thermostat rebate runs through the capture portal, Comfort Home runs through NYSERDA, and Clean Heat heat pump rebates run through your installer. The three are filed independently and do not overlap in scope.
  • Solar: NY-Sun + state solar credit. Both apply on every Nassau address. NY-Sun is netted against the contract; the state credit is claimed on the next year's return on the post-rebate cost.
  • Income-qualified entry. Start with EmPower+. The income certification it produces qualifies a household for the higher PSEG LI geothermal tier and for Solar for All community solar.

County or city programs unique to here

Nassau County government does not run a county-administered residential cash rebate program for energy upgrades. The county's Office of Sustainability publishes guidance and links out to state and utility programs rather than funding its own. The locally distinctive layer here is town-level and nonprofit-led:

  • Long Island Green Homes. A regional home-energy program that originated at the Town of Babylon in Suffolk and grew to operate across the Island. It functions as a free intake and contractor-matching service for energy audits, weatherization, and heat pump retrofits. For most Nassau homeowners considering a whole-house upgrade, this is the first call.
  • Town of Hempstead Department of Conservation and Waterways. The town runs sustainability initiatives and has periodically partnered on Solarize campaigns. Hempstead is the largest town in the country by population, so its local programs reach more Nassau residents than any other municipal source.
  • Town of North Hempstead and Town of Oyster Bay. Both maintain sustainability staff and have participated in Solarize cycles. Program availability moves year to year; check the town site before assuming a cycle is open.
  • Solarize campaigns. Long Island Solarize cycles run town by town with vetted installers and fixed pricing for a limited window. Past Nassau participants have included Great Neck, Port Washington, and several villages on the North Shore.
  • PSEG Long Island Home Energy Assessment. Free to any PSEG LI electric customer. The auditor delivers a written report and direct-install measures (LEDs, smart strips, occasionally low-flow showerheads).

Who to call locally

  • Long Island Green Homes: longislandgreenhomes.org. Free intake for energy audits, weatherization, heat pumps, and connecting to a vetted contractor.
  • PSEG Long Island residential customer service: 1-800-490-0025. Use this line for rebate questions, the home energy assessment, and Smart Savers enrollment. Geothermal goes through a participating Geothermal Partner from the PSEG LI contractor finder.
  • National Grid residential customer service (Long Island gas): 1-800-930-5003. Gas equipment rebates, ConnectedSolutions enrollment, and gas-side weatherization questions.
  • Nassau County Office of Sustainability: housed under the County Executive's office. Useful for county-wide planning and climate-related questions; not a rebate funder.

Climate Smart Communities status

Nassau County itself is registered with the New York State Climate Smart Communities program. Several Nassau municipalities are certified at the bronze level, including the City of Long Beach, the Town of North Hempstead, and the Village of Great Neck. Certification status changes; confirm a specific town's current level against the Climate Smart Communities certified-communities list before citing it in dated material.

Important local dates

  • Solarize campaign windows on Long Island are typically open for a few months per town and close before installations begin. Sign-up deadlines are firm. Check the Long Island Green Homes site or your town sustainability page for an open cycle.
  • PSEG Long Island runs on annual program budgets. Geothermal amounts were updated for the 2026 program year. File the rebate paperwork as soon as the install is complete; mid-year budget exhaustion has occurred in past Long Island rebate cycles.
  • The federal 25C heat pump tax credit follows the calendar year. Equipment placed in service by December 31 counts for that tax year.

Source

NYSERB.com is an independent research site. It is not affiliated with Nassau County, PSEG Long Island, National Grid, Long Island Green Homes, the State of New York, or any utility. Verify all program details and incentive amounts directly with the relevant program administrator before making any financial decision.

Verified against www.psegliny.com, www.longislandgreenhomes.org, www.nassaucountyny.gov on May 27, 2026.

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