New Hampshire's Trusted Source for Whole-Home Backup Power

Residential Generator Installation

When a New England storm knocks out the power, your family deserves more than candles and crossed fingers. A permanently installed standby generator keeps your lights on, your heat running, and your refrigerator humming -- automatically, even when you're not home. Powers Guaranteed has been delivering that kind of reliability since 1994, and we handle every detail so you don't have to.

Why Homeowners Choose Powers Guaranteed

Turnkey Installation

We manage the entire process from start to finish. That means the in-home consultation, equipment selection, gas piping, electrical work, concrete pad, permitting, inspections, and final commissioning are all covered under one roof. You make one call, and we take care of the rest.

Year-Round Capability

Frozen ground doesn't stop us. Our crews use electric heat mats and hydronic ground-thawing units to install generators throughout the winter months -- so you don't have to wait until spring to protect your home.

Licensed in Three States

We hold full electrical and gas licenses in New Hampshire, Massachusetts, and Vermont. Every installation meets or exceeds local codes, and our install coordinator handles all permits on your behalf.

Our Installation Process

In-Home Consultation -- A sales professional visits your property to assess your electrical panel, gas supply, and ideal generator placement. Most customers receive a quote the same day.
Equipment Selection -- We'll recommend the right generator for your home's size and power needs. We install Generac, Kohler, and Briggs & Stratton, generators.
Permitting and Scheduling -- Our office team pulls every required permit and schedules your installation, typically 4 weeks from the signed agreement.
Professional Installation -- Our licensed crew handles site prep, gas connections, electrical wiring, and the automatic transfer switch.
Testing and Walkthrough -- We run a full load test, walk you through the controls, and make sure everything operates exactly as it should.

Generator Repairs

Is your generator struggling to run or completely malfunctioning? Contact us for prompt and expert repair service. We work on all brands and manufacturers including Generac, Kohler, Briggs & Stratton, and more. Whether we installed your generator or not, our EGSA-certified technicians can diagnose the problem and get your system back up and running.

Brands We Install

Frequently Asked Questions

Pricing depends on the size of the generator and how much of your home you want to power. Visit our pricing section above for current ranges on fully installed systems.

We install generators from Kohler, Briggs & Stratton, and Generac. Your consultant will help you compare features, warranty terms, and pricing so you can make an informed decision based on your home's needs.

Not really. The price differences between brands are minimal for comparable units. The biggest factor affecting cost is the size of the generator you need, which depends on how much of your home you want to power.

Yes. We offer a range of maintenance and service plans to keep your generator running reliably year after year. From annual tune-ups to our Never Without Power Guarantee, we have options to fit every need and budget. Learn more about our maintenance plans.

See our installation process above for the full timeline. The on-site installation itself is usually completed in one to two days.

Once we have a signed agreement, our team begins the permitting process right away. See our installation process above for the typical timeline.

Our headquarters is located at 5 Business Center Drive in Swanzey, New Hampshire. We provide generator installation and service throughout New England, with service locations across New Hampshire, Vermont, and Massachusetts.

Yes, we install year-round. See the details in our Year-Round Capability section above.

No. Our team handles every permit and inspection on your behalf, as described in our installation process above.

What Our Customers Are Saying

Ready to Keep the Lights On?

Over 70 professionals. Thirty-plus years of experience. A Net Promoter Score consistently above 90. Find out why thousands of New England homeowners trust Powers Guaranteed with their backup power. Schedule your free in-home consultation today or call us at 800-853-7202.

Residential Generator Installation

New Hampshire's Trusted Source for Whole-Home Backup Power