Top-rated generator install pros.

Get matched with top generator install pros in Holliston, MA

Enter your zip and get matched with up to 5 pros

Need a pro for your generator install project in Holliston, MA?

Select your specific project to find the pro for you.

Find Generator install pros in Holliston

Avatar for VMA Electric Inc
VMA Electric Inc
4.8(
468
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Holliston, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2005

Free estimates

Emergency services offered

"From the office folks to the electrician who did the work -- friendly and professional. They quoted the lowest price of three estimates and did the work within a couple of weeks. I purchased my generator elsewhere online... and VMA walked me thru the process of hooking it up, running it, and shutting it down. Very helpful."
Needham Project
22kw Generac
27kw
Response time8 hrs
Response rate100%
17 neighbors recently requested a quote
Avatar for Champion Electrical Services Inc
Champion Electrical Services Inc
5.0(
59
)
Portable Generator - RepairFixed Generator - Repair

Serving Holliston, MA and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

"I will recommend Champion Electrical Services to anyone interested in hiring competent, reliable and honest electricians. It starts with salesmen Jayron Diaz who submitted the job estimate to upgrade an electric panel to code. There was no surprise costs. Jayron was very professional and honest about the work. On the day of the service, Matt Wood and Sean arrived at the scheduled time as promised. Matt explained what they were going to do, how long it would take, and if I had any questions. Matt estimated the job would take approximately 6 hours. It actually only took 4 hours from start to finish and that included cleanup and minor repairs. I think Champion did an awesome job and I will call upon them for my next project."
My jobs
My jobs
My jobs
My jobs
My jobs

+17

102 neighbors recently requested a quote
Avatar for Champion Electrical Services Inc
Champion Electrical Services Inc
5.0(
57
)
Fixed Generator - InstallPortable Generator - InstallGenerator - Install - For Business

Serving Holliston, MA and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

At Champion Electrical Services, we believe homeowners deserve better. No more no-shows, rushed work, or upsells you don't need. We built this company to do things right - with respect, craftsmanship, and pride. Every project is treated like it's being done in our own home: clean, code-compliant, and built to last. Whether you need a panel upgrade, EV charger, generator, or quick repair, we show up when it counts and earn your trust every time. \nLicensed, insured, and proudly serving MA & RI. \nWhen the lights go out, don't call just anyone. Call the Champ. \n \n(774) 331-3500 \nCalltheChamp.com \[email protected]

Hotel 4Homeless Dogs
Pan Mass Challenge
Attleboro Cheer Team
The Autism Corner
Generac Generator

+1

117 neighbors recently requested a quote
T K Lyden Electric & Generator, Inc.
3.9(
114
)
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Install

Serving Holliston, MA and surrounding areas

Approved

In business since 1994

Free estimates

Credit card accepted

T.K. Lyden Electric & Generator Inc. is a family owned electrical contractor with over 50 years of experience serving Central & Western Massachusetts and Southern New Hampshire. We provide complete standby power solutions featuring Generac, Kohler, Briggs & Stratton, Honeywell, and other major brands. Our team offers installation, repairs, warranty service, and annual maintenance plans.

4 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for Ryan Cassidy
Ryan Cassidy
5.0(
11
)
Fixed Generator - InstallGenerator - Install - For Business

Serving Holliston, MA and surrounding areas

Approved

In business since 1990

Free estimates

Emergency services offered

"I would hire Ryan again in a second! His quality of work was excellent, he was reasonably priced, and he always responded promptly and did his best to work with my schedule while. I plan to recommend him to anyone in need of electrical work!"
Garage Sub Panel
Garage Circuit Lighting/Receptacles
Garage Circuit Lighting/Receptacles
Garage Circuit
Garage Circuit

+73

Response time2 days
3 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Cotti-Johnson Heating-Cooling-Electrical
Cotti-Johnson Heating-Cooling-Electrical
4.7(
168
)
Fixed Generator - InstallPortable Generator - InstallGenerator - Install+2 more

Serving Holliston, MA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1948

Free estimates

Emergency services offered

"Jason and his team with Cotti-Johnson did an excellent job updating our electrical boxes, installing the washer/dryer hookup, and getting us setup with a generator! Sam, our assigned electrician, even took the time to go through the entire operation of the generator from A-Z. I would definitely recommend them for any electrical work!"
Navien Install
Backflow
Outdoor Shower
Well Tank Replacement
Filtration Installation

+62

Response time10 hrs
60 neighbors recently requested a quote
Recommended by88%of homeowners
...
Showing 1-10 of 153
Generator Install questions, answered by experts

It is safe to run a generator continuously, but you must follow safety protocols to ensure personal and home safety. Read the manufacturer’s instructions for specific recommendations, but the general recommendation is to turn generators off overnight or when you’re away from the house. Overworked generators can pose a fire hazard and if your generator is not in a well-ventilated area, running it continuously could lead to carbon monoxide poisoning.

The amount of time a standby generator can run continuously is around 3,000 hours on average. However, standby generators can generally run indefinitely as long as they have a continuous fuel supply. Generators hooked up to a home’s natural gas supply are the best option for extended usage, as these won’t rely on a finite fuel supply based on how much you have in storage. Generators running on liquid propane or diesel won’t last as long, as these require fuel storage and regular refueling to stay running.

In some situations, yes. Never try to put biofuel into any home generator without checking the specifics first. If a generator has the ability to run on diesel, it can also run pure biofuel (the clear kind made from seed oils, for example). But if you are using biofuel made from animal fats or vegetable oils, the generator will need significant modifications before it can handle a sludgier type of biofuel.

A portable generator can supply power to selected appliances and circuits in a home, but it's generally not designed to handle the entire household's electrical needs simultaneously. Portable generators have limited wattage capacity, so they are only designed to power essential devices and electronics temporarily until local power is restored. If your power needs outweigh the capabilities of a portable generator, consider installing a whole-home generator instead.

To determine the right size generator for your house, you should calculate the total wattage of the appliances and devices you want to power during an outage. List all essential items, note their start-up wattages, and add them together.

Here are some typical wattage requirements for common appliances:

  • Refrigerator: 600 watts

  • Large dehumidifier: 700 watts

  • Large window air conditioner: 1,400 watts

  • Water heater: 3,000 to 4,500 watts

  • Electric furnace: 5,000 to 25,000 watts

A 7,500-watt generator might be sufficient for essentials like a refrigerator, freezer, well pump, and lighting circuits. However, for high-demand items like a water heater or furnace, a whole-home generator is a better choice. A portable generator may be enough if you only need to power a few critical items.

While home square footage can offer a rough estimate, it is not always a reliable indicator. For reference, here are some typical generator sizes based on square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14 kW

  • 2,500 sq ft: 12–16 kW

  • 3,000 sq ft: 16–20 kW+

For the most accurate sizing, consult a professional who can calculate your home's peak and average power consumption and recommend the optimal generator.

The Holliston, MA homeowners’ guide to generator installs

From average costs to expert advice, get all the answers you need to get your job done.