4.5 
50 *The Angi rating for Generator Install companies in Derry, NH is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.
*The HomeAdvisor rating for Generator Install companies in Derry, NH is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.
Last update on May 27, 2026
Serving Derry, NH and surrounding areas
Approved
In business since 2019
Free estimates
Emergency services offered
"The installation went flawless. There were 5 installers and everyone one was a professional and had it done in super time. Would recommend them to anyone looking for a generator."
+5
Serving Derry, NH and surrounding areas
Approved (Corporate)
Super Service Award Winner
In business since 1987
Free estimates
Credit card accepted
"Djems the tech was personable, professional and thorough. If possible I will ask for him to service our generator in the future. Great to see his work ethic!"
Serving Derry, NH and surrounding areas
Approved
In business since 2002
Free estimates
Warranties offered
"Competent, quick, and neat. Explains installation and operation in detail. Returns calls quickly and has better customer service skills than most companies I have dealt with. This job was for wiring a backup generator to house. Will hire again for any electrical work needed."
Serving Derry, NH and surrounding areas
Approved
In business since 2006
Free estimates
Warranties offered
"Upgraded the service to the house, grounds, new/larger primary panel, sub-panel installed in garage, exterior generator wired. Very neat/clean work, very quick. Very happy."
Serving Derry, NH and surrounding areas
Approved
In business since 2003
Free estimates
Credit card accepted
"Jeff knows his stuff. Commercial quality skillset and workmanship - so taking care of our "residential" needs was easy as cake for him, and his confidence level in the work he was doing made it easy for us to rely on him to get our problems solved."
Serving Derry, NH and surrounding areas
Approved
In business since 1990
Free estimates
Customers say: True professional
"I have to say that David Krafton is an excellent electrician. I. Called him about a. light. Over. My sink that I could not fix by replacing the bulbs. He came out and told. Me the light was not working, as it was shorted out. He then went and bought me a new light and installed it. It works get and is so much brighter the the previous one. Thank you David I will be calling you again to do other work for me. Loraine in Bedford N.H."
+5
Serving Derry, NH and surrounding areas
Approved
In business since 2024
Free estimates
Emergency services offered
"They were wonderful, did a great job!"
+1
Serving Derry, NH and surrounding areas
Approved
In business since 2018
Free estimates
Credit card accepted
"Tyler and his crew were amazing! Professional, on time, great communication, and the work is top notch! From first visit to get an estimate to cleaning up the job site, perfect! Thank you and highly recommend to anyone that is looking for electrical work!"
+10
Serving Derry, NH and surrounding areas
Approved
In business since 2025
Free estimates
Emergency services offered
"Hewson Electric could not have done better with our new detached garage! They even installed a generator on my new structure and it couldn’t look more professional. So happy with them, I will never call another contractor for electrical work!!!"
Serving Derry, NH and surrounding areas
Approved
In business since 2023
Free estimates
Warranties offered
With over 10 years of experience, we pride our company on our quality of work. We are owner operated, and believe in building long-term relationships with our clients by delivering tasks that are accomplished in a neat and workman like manner. Give us a call today. We look forward to working with you!
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