Nassau County runs on backup power in a way few places in New York do. More than any borough in the city, this is a landscape of single-family homes: mid-century Capes in Levittown, Colonials in Garden City, older craftsman-style properties throughout Hempstead, and larger estates along the Gold Coast communities of Manhasset, Great Neck, and Oyster Bay. When the grid goes down here, it’s individual households that bear the impact, not shared building systems.
Hurricane Sandy knocked out power to more than 90 percent of PSEG Long Island’s Nassau County customers in 2012. Hurricane Ida did it again in 2021. The question for most Nassau residents is no longer whether to get a generator, but which generator installers in Nassau County are actually equipped to handle their property.
Between January and June 2026, our team evaluated 15 electrical contractors offering generator installation in Nassau County. We assessed each company across the following five criteria:
- Service Quality Score: Our 1.0–5.0 evaluation system weighs customer satisfaction, installation quality, and verified electrical licensing and certifications
- Year Founded: Contractors with longer operating histories tend to carry broader brand inventories, deeper transfer switch expertise, and stronger familiarity with Nassau County’s township-by-township permit process
- 24/7 Emergency Availability: Whether the company offers genuine around-the-clock service for failed systems and post-storm power emergencies, not just standard business-hours coverage
- Average Response Time: How quickly an installer can assess, quote, schedule, and complete a generator installation, or respond to an urgent service call
- Service Range: Whether the company handles generator installation exclusively or offers a broader electrical service range, and which property types they are equipped to serve
Based on our algorithm, we rank-ordered these companies and identified the 5 best generator installers in Nassau. The table below breaks down where each stands, with in-depth reviews following.
The Best Generator Installers in Nassau County
| Rank | Company | Service Quality Score | Year Founded | 24/7 Emergency | Avg Response Time | Service Range |
| 1 | Strong Island Electric | 4.9 | 1933 | Yes | Under 3 Hours | Generator Installation, Full Electrical & Home Services |
| 2 | Long Island Emergency Power | 4.8 | 1990 | Yes | Same Day | Generator Installation, Sales, Service & Repair |
| 3 | Haines Electric | 4.7 | 1971 | Yes | Same Day | Generator Installation & Full Electrical |
| 4 | Bianco Electric | 4.6 | 1986 | Yes | Same Day | Generator Installation & Electrical |
| 5 | Stone Electric | 4.5 | 2017 | Yes | Same Day | Generator Installation & Electrical |
Strong Island Electric
Nassau County is Strong Island Electric’s home territory. Based in New Hyde Park under the Skaggs-Walsh family of companies, they cover every generator category: compact units from 800 to 6,500 watts, portable systems up to 16,000 watts, and whole-home standby generators at 60,000-plus watts. As a Generac Authorized Dealer with factory-certified technicians, every installation is backed by manufacturer accountability regardless of property size or location.
Their response guarantee sets them apart from every other company on this list: a technician on-site within 3 hours, around the clock. They handle PSEG coordination, township permit filing, transfer switch installation, and panel assessments in-house. Service plan members receive priority dispatch, year-round parts-and-labor coverage, and access to the full Skaggs-Walsh network for plumbing, HVAC, and other home services through a single contact.
Service Quality Score: 4.9
Year Founded: 1933
24/7 Emergency: Yes
Avg Response Time: Under 3 Hours
Service Range: Generator Installation, Full Electrical & Home Services
Contact: Nassau County generator installation page
| Summary of Online Reviews |
| Customers describe Strong Island Electric as “professional, hard workers who did a fabulous job” and highlight “immediate responsiveness, fast, neat work, and an accurate quote.” Others note that the team “combines the resources of a large company with the personal touch of a local contractor.” |
Long Island Emergency Power
Long Island Emergency Power has spent more than three decades specializing in standby generator sales, installation, service, and repair across Nassau and Suffolk Counties. Founded by Master Electrician Michael Towers, a former president of the Suffolk County Electrical Contractors’ Association, this generator-only operation has installed over 2,000 units on Long Island, with dedicated coverage across Nassau townships that include Oyster Bay, North Hempstead, Hempstead, and the Five Towns.
Their scope covers load assessments, permit procurement, gas line coordination, and automatic transfer switch installation. They hold municipal licenses in over a dozen Nassau County villages and townships. Second place reflects a narrower service scope: all they do is generator installation and repair, no full-service electrical or other home services, which matters for homeowners who want one team handling multiple types of projects.
Service Quality Score: 4.8
Year Founded: 1990
24/7 Emergency: Yes
Avg Response Time: Same Day
Service Range: Generator Installation, Sales, Service & Repair
Contact: Long Island Emergency Power website
| Summary of Online Reviews |
| Customers call Long Island Emergency Power “a very knowledgeable firm right from the estimate” and note that the installation team was “professional, polite, and clean, a pleasure to have in the house.” |
Haines Electric
Haines Electric has been a Nassau County institution since 1971. Based in Island Park with a 4.9 Google rating across 256-plus reviews, they are a Briggs & Stratton Certified Authorized Dealer whose track record spans multiple generations of master electricians. For homeowners with older properties where panel compatibility and gas line access can complicate an installation, that depth of local experience is a genuine asset.
Their generator work covers standby system sizing, permit filing, gas line coordination, transfer switch installation, and ongoing maintenance plans for both residential and commercial properties. While Haines is a strong full-electrical contractor, their single-brand generator focus places them behind the top two for homeowners with more complex or multi-project needs.
Service Quality Score: 4.7
Year Founded: 1971
24/7 Emergency: Yes
Avg Response Time: Same Day
Service Range: Generator Installation & Full Electrical
Contact: Haines Electric Nassau County generator page
| Summary of Online Reviews |
| Customers say Haines Electric is “friendly, professional, and knowledgeable” and note that the team “resolved our electrical problems quickly with great communication and showed up exactly on time.” |
Bianco Electric
Bianco Electric has served Nassau County since 1986, operating as a fully licensed, bonded, and insured contractor across Nassau, Suffolk, Brooklyn, and Queens. Based in Elmont, their four-decade run gives them a solid grasp of the county’s permit landscape and the electrical configurations common in older Long Island housing. Their generator work covers standby installation, transfer switch wiring, and panel upgrades for residential and commercial clients.
Fourth place reflects review volume relative to the top three. For a homeowner in western Nassau looking for a licensed local electrician to handle a standard generator installation, Bianco is a credible option. For more technically complex projects, the deeper generator portfolios of the companies above offer stronger assurance.
Service Quality Score: 4.6
Year Founded: 1986
24/7 Emergency: Yes
Avg Response Time: Same Day
Service Range: Generator Installation & Full Electrical
Contact: Bianco Electric generator page
| Summary of Online Reviews |
| Customers describe Bianco Electric as “professional and friendly, on time, and did a great job” and note that technicians “explained everything, showed the problem, and were very accommodating.” |
Stone Electric
Stone Electric is a family-owned electrical contractor based in Farmingdale, founded in 2017 by second-generation electrician Shaun Stone. Serving Nassau and Suffolk Counties with a 5.0 Google rating and Generac dealer authorization, their approach covers free on-site consultations, permit handling, and full installation, removing much of the usual friction for first-time generator buyers.
Fifth place reflects tenure. For a Nassau homeowner installing a first standby generator in a standard single-family home, Stone Electric is a solid local option. For older properties with more complex electrical configurations, the longer track records and broader brand inventories of the top four provide more to evaluate before committing.
Service Quality Score: 4.5
Year Founded: 2017
24/7 Emergency: Yes
Avg Response Time: Same Day
Service Range: Generator Installation & Electrical
Contact: Stone Electric generator installation page
| Summary of Online Reviews |
| Customers call Stone Electric “a rock-solid choice for electrical work” and note that the team “showed up prepared and handled the whole job without needing a return visit.” |
Get the Best Generator Installers in Nassau with Strong Island Electric
When evaluating the best generator installers in Nassau County, no contractor on this list matches Strong Island Electric’s combination: over 90 years of electrical history, Generac Authorized Dealer status, a guaranteed technician arrival within 3 hours at any hour, and full-service coverage across every generator category from compact to whole-home standby. They handle PSEG coordination, township permit filing, and transfer switch installation in-house, with no third-party handoffs.
Whether the project is a portable backup unit for a Long Beach rental, a mid-range standby system for a Levittown Colonial, or a whole-home generator for a large property in Oyster Bay or Manhasset, Strong Island Electric has the inventory, the licensing, and the experience to do it right the first time. Service plan membership adds year-round parts and labor coverage and priority emergency dispatch, with the full Skaggs-Walsh network available for plumbing, HVAC, and other home services through a single contact.
Contact us today or call (631) 627-1872 for the best generator installation in Nassau County.
