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Book A ServiceGenerator Installation in Salem, NH
Backup Power Generator Installation in Southern NH & Northern MA
Power outages in Rockingham County don’t wait for a convenient time. Nor’easters, ice storms, and summer thunderstorms can cut power for hours or days, leaving homes and businesses without heating, cooling, refrigeration, and medical equipment. Cornerstone Services installs standby generators for residential and commercial customers across Salem, NH, and throughout Rockingham County, Hillsborough County, and Essex County. We’re BBB-accredited with an A+ rating and backed by more than 1,250 five-star reviews across Google, HomeAdvisor, Facebook, and Yelp.
Generator installation is part of our full-trade service model. Our electricians are licensed through the New Hampshire Electricians’ Board, and our service vehicles are staged on-call from multiple locations so we can reach you across the service area without delay.
- Rockingham County, NH
- Hillsborough County, NH
- Essex County, MA
Ready to install a standby generator? Call Cornerstone Services at (603) 874-1402 for a same-day free estimate.
How Does a Standby Generator Work?
A standby generator monitors your utility feed continuously. The moment it detects a power failure, an automatic transfer switch disconnects your home or business from the grid and connects it to generator power, typically within 20 seconds. You don’t need to be home, flip any switches, or pull a cord. When utility power is restored, the transfer switch reconnects the property, and the generator shuts itself down automatically.
That automatic transfer switch is what separates a standby generator from a portable unit and why the installation requires a licensed electrician. Our backup power generators can support your essential systems, including lighting, HVAC, refrigeration units, sump pumps, medical equipment, computer systems, and alarm and security systems. When a Rockingham County nor’easter knocks out power for several days, those systems can keep running without any action on your part.
Which Appliances Can a Standby Generator Power?
The right generator capacity depends on your total connected load and fuel type, not just the size of your home or business. A licensed electrician’s load assessment is the accurate way to size a generator for your property. As a starting point, here’s what each wattage tier typically supports:
- 7,000–9,000-Watt Unit: A generator in this range can power essential home appliances such as a freezer, refrigerator, sump pump, and air conditioner, along with some lights and a small television or microwave oven.
- 10,000–13,000-Watt Generator: This range can power the essentials as well as systems with larger loads, such as a well pump, hot water heater, and large HVAC unit. You may also have enough capacity to operate a desktop computer or home entertainment equipment.
- 14,000–15,000-Watt Standby Generator: In this tier, you can typically run everything a 10,000–13,000-watt generator supports while also powering multiple kitchen appliances, like the coffee maker and toaster, at the same time.
- 16,000 Watts and Greater: For large homes with multiple air conditioners, hot water heaters, and well pumps, as well as pool pumps and hot tubs you want to keep running, a backup power generator with 16 kilowatts or more is often appropriate. This tier also fits commercial properties running multiple HVAC units and heavy loads simultaneously.
Fuel type matters too. Natural gas and propane generators have different supply requirements, and the available fuel source on your property affects which units are viable. We factor all of this into the site assessment before recommending a system.
Our Generator Installation Process
We offer same-day free estimates for generator installations. Once we’ve assessed your property and sized the right unit, a complete installation typically includes site preparation and generator placement, running the natural gas or LP fuel line, installing the automatic transfer switch, making all electrical connections to your panel, and a full operational test before we leave. If your electrical panel is outdated or undersized, we’ll flag that during the assessment. A panel upgrade may be needed before a generator can be safely connected, and our electricians handle that work as well.
Most residential standby generator installations in Salem require a permit from the local building authority. As a licensed electrical contractor registered with the NH Department of Safety Division of Fire Safety, we handle the permit process on your behalf. You don’t need to navigate that separately. Installation typically takes one to two days depending on site conditions and generator size. When the job is done, our technicians clean up completely. We also service generators from Generac, Kohler, and Briggs & Stratton, so we can support your system long after installation with comprehensive maintenance checks, repairs, and upgrades.
Why Salem Homeowners & Businesses Choose Cornerstone Services
Every differentiator below is documented and consistent across our jobs.
- Flat-Rate, Per-Job Pricing: We price by the job, not the hour. The number we quote you is the number you pay at completion. No hourly overruns, no adjustments, no hidden fees.
- Signed Workmanship Warranty: Every completed job is backed by a signed warranty under our quality assurance policy. That’s documented protection on our work, not a vague satisfaction pledge.
- Same-Day Service and 24/7 Availability: We offer same-day scheduling for customers who need help quickly, and our on-call staff is available for scheduling, questions, and urgent needs.
- Background-Checked Workers: Every worker we send to your property has passed a background check before setting foot in your home or business.
- Financing and Monthly Promotions: Financing options are available for generator installation. We also run rotating monthly promotions that can reduce the cost of scheduled services. Ask about current terms when you call.
- Single-Provider Multi-Trade Model: Electrical, plumbing, HVAC, cleaning, and handyman services are all available through one company and one call. If the installation reveals a panel upgrade, a plumbing connection for a whole-house water heater, or any other trade need, we can handle it under the same warranty and pricing structure. You don’t have to coordinate multiple contractors.
Frequently Asked Questions
Will a Standby Generator Raise My Energy Bills?
No. A standby generator only draws fuel and runs during actual power outages. It doesn’t consume electricity from the grid at all, so your regular utility bill isn’t affected. Fuel costs do apply when the generator runs, but there’s no ongoing electrical draw during normal operation.
What Maintenance Does a Standby Generator Need After Installation?
Standby generators should be serviced annually or after 200 hours of operation, whichever comes first. A standard service visit covers oil changes, battery checks, spark plug inspection, and a functional test. Many units also run a short weekly self-test cycle automatically, which confirms readiness between professional visits. Our electricians perform comprehensive maintenance checks and can advise on any repairs or upgrades your system needs. We service Generac, Kohler, and Briggs & Stratton generators.
Get a Free Estimate on Generator Installation in Salem, NH
Our generator installers understand how much depends on reliable power, especially when a New England storm knocks out the grid with no warning. Cornerstone Services offers backup power generator installation, electrical repair, lighting installation, and electrical panel and wiring services for residences and businesses throughout Rockingham County, Hillsborough County, and Essex County. Same-day estimates are available.
Call Cornerstone Services at (603) 874-1402 to schedule your free generator installation estimate today.
The Cornerstone Difference: Built on Trust. Backed by Service.
The service standards behind the thousands of positive experiences our customers share year after year.
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Flat-Rate Pricing
The price you're quoted before the job begins is the price you pay at completion, no hourly adjustments, no surprise charges.
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On-Time Arrival
Service vehicles are staged at multiple locations so we show up when we say we will, not hours after your window closes.
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Signed Workmanship Warranty
Every job comes with a signed warranty under our quality assurance policy. You get a written record of what the work covers.
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Background-Checked Workers
Every technician passes a background check before they step onto your property, regardless of the trade or type of job.
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Same-Day Scheduling
Call us and we'll work to get a technician out the same day. Our on-call staff is available 24 hours a day, every day of the week.
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Clean Job Sites
Your home or business will be left clean when we're done. Technicians are responsible for cleaning up after every job, no exceptions.
1,250+ Five-Star Reviews & Counting
We let our work speak for itself. From quick repairs to major installs, our customers say it best.
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Paul Quinn did electrical work for me and he was the best!Nicola Sullivan
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Michael with Cornerstone Services was excellent to work with.Jamie Fasbender
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He was very professional and explained all that he was doing.Mary Duford
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Showed up as agreed and was very informative.John Cote
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Fast response and very professional.Anne Butterworth
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On time. Thorough. Kind. Positive attitude in this awful heat.N N
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Cornerstone came promptly and fixed them.Marilyn Frank
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He and his partner PJ worked quickly and efficiently to solve a dryer vent issue we had been experiencing.Pierre Thelusma
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Took care of our electrical needs with ease!Peter Larocque
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He was quick, thorough, professional, and made sure everything was done right.Jess Nichol
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10/10 experience and so happy we got in touch with him and this company!Anthony Capozzi
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They were so neat, you would never know there was a problem.Bill Mullen
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Paul is always friendly, polite, and professional.Cindy Marcin
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Paul was efficient and expert at correcting the problem and ensuring all was well.Woodrow Cook
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He went above and beyond for me when some unforeseen issues arose with my bathtub install.Susan Hevey
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Tech was on time, friendly, and competent.Vincent JJ Balukonis
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He was very thorough and quickly corrected the issue.Gary Chisholm
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Josh was very prompt with his services and explained things clearly.Kim Mcanany
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Arnold is a pleasure to work with.Esther Bradbury
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Jason is always great and knowledgeable and friendly.Mark Duell