Every real, verified company that installs standby and portable generators in Nassau and Suffolk counties — compared in one place, with services, service areas and one-tap calling. Ratings are shown only where the research found one; where no rating was found, none is shown — figures from other review sites are never presented as Google ratings.
On Long Island, outages usually arrive with coastal storms, and restoration in Nassau and Suffolk can take days. A standby generator starts on its own seconds after the power fails, keeping lights, heat and refrigeration on until the grid is back.
So don't just compare prices. Send one request and compare up to three local quotes — scope, warranty and timeline side by side. The installers answer your questions directly.
Filter by town, compare services and service areas, then call directly or request up to three quotes with one form. Every company below was verified against its own website and directory records.
Generac PowerPro Elite dealer in Hempstead serving all of Nassau and Suffolk. Its own website publishes county license numbers and a 22 kW installed price of $11,000–$16,500.
Mineola electrician offering generator installation, serving Nassau and Suffolk. Its own website publishes two numbers: the main number and a “South” number for its Syosset listing — the same company.
Albertson company in business since 1961 that installs, maintains and repairs generators, serving Long Island and Queens.
Oyster Bay generator team working under both names: the generator page belongs to Skaggs-Walsh, and the work is attributed to its Strong Island Electric team. Generac, Kohler and Briggs & Stratton.
Farmingdale company offering Generac generator sales and installation across Nassau and Suffolk.
Farmingdale company in business since 1988 offering backup solutions and service upgrades across Nassau and Suffolk. The Nassau number is shown as the main number.
Massapequa Park company listing generator installation. Its own contact page does not detail services, so the service is recorded from directory listings.
Family business since 1996 based in Wantagh, offering generator installation across Long Island.
Generator specialist offering sales, installation, maintenance, repair and warranty service — Generac PowerPro Elite and Industrial, Briggs & Stratton — with more than 2,000 maintenance clients per its own website.
Huntington Station company offering standby generators and automatic backup systems across Suffolk and Nassau.
Babylon company offering generators across Long Island, including Fire Island. Its own website states it is fully licensed and insured in all Nassau and Suffolk municipalities, with no number published.
Bohemia company since 2004 offering Generac and Kohler systems from 14 to 22 kW, permits and inspections included, serving all of Suffolk. Its own website lists installed prices: Babylon $8,000–$11,000; Laurel $9,000–$16,000; Eastport $13,000–$18,000.
Holtsville company offering generator installation, standby generators and generator wiring across Long Island.
Brookhaven company since 2000 offering portable and standby generator installation, with job photos on its own website, serving Nassau and Suffolk.
Port Jefferson company offering Generac generator installation, with generator-ready wiring, transfer switches and inlet boxes. Its own website publishes license #5153ME without specifying a county.
East Setauket HVAC company since 2019 offering generator installation (Generac) across all of Suffolk and Nassau; the generator is one of many services.
Family business since 1969 in Westhampton Beach and a Generac distributor: installation, repair and warranty, transfer switches, and gas or LP line.
Flanders company since 2016 offering Generac generators across the North Fork and South Fork, including Shelter Island.
Mattituck company with more than 20 years in eastern Long Island, mentioning generators on its own website alongside a focus on lighting and home automation.
Replacement listing approved during review: offices in Deer Park (Suffolk) and Uniondale (Nassau), with generator installation confirmed on its own website. Founded in March 2000 by Master Electrician Anthony Sofia.
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Local companies' own published prices put a typical installed standby system roughly in the $8,000–$18,000 range. Long Island Electric Co. lists a 22 kW system at $11,000–$16,500; Marra Electric lists $8,000–$11,000 (Babylon), $9,000–$16,000 (Laurel) and $13,000–$18,000 (Eastport) for 14–22 kW systems, permits and inspections included. Every installer prices your job after a site visit.
Local companies' own published prices put a typical installed standby system roughly in the $8,000–$18,000 range. See the cost guide for the published prices and what drives a quote.
New York has no statewide electrician license — Nassau and Suffolk counties license electricians separately. Only two companies in this guide publish a license number on their own website: Long Island Electric Co. (Nassau #E-1194A, Suffolk #54221-ME) and HomeOps Electric (#5153ME, county not specified). Every other profile states the company's own claim-only wording or that no number is published.
A standby generator is permanently installed and starts automatically when the power goes out; a portable generator is moved into place and powers selected circuits. Most installers in this guide focus on standby systems; MJ Electrical Contracting lists both portable and standby installation. Ask each installer to size the system for what you actually want to keep running.