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TRUSTED BY GREENVILLE, DE HOMEOWNERS

  • Average homeowner rating star icon4.9
    Average homeowner rating
  • Verified reviews icon16
    Verified generator installs reviews

Top-Rated Generator install pros in Greenville - Updated Nov 2026

Avatar for Princeton Electrical Makeover LLC
Princeton Electrical Makeover LLC
4.5(
210
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+2 more

Serving Greenville, DE and surrounding areas

Approved

Super Service Award Winner

In business since 2008

Free estimates

Emergency services offered

"Brian was awesome and fast and courteous. Princeton Electrical was easy to communicate and negotiate with, and offers a fair price for their labor. Had a Level 2 EV charger installed from my townhouse basement to my garage in a few hours without problems."
Tesla in charging status
Wiring Tesla Wall Connector
Full installation
Connection in the panel
Additional Photos

+26

Response time2 days
22 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for BAY LINE CONSTRUCTION, LLC
BAY LINE CONSTRUCTION, LLC
5.0(
8
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business

Serving Greenville, DE and surrounding areas

Approved

In business since 2020

Free estimates

Offers commercial services

"Bay Line Construction did an excellent job installing my EV charger. The crew was professional, efficient, and the work was clean and high quality. They communicated well throughout the process and made everything easy. I highly recommend Bay Line Construction for any electrical work."
project photos
12 neighbors recently requested a quote
Avatar for Harris Plumbing, Heating, Air & Electrical
Harris Plumbing, Heating, Air & Electrical
3.9(
54
)
Fixed Generator - InstallFixed Generator - Repair

Serving Greenville, DE and surrounding areas

Approved

In business since 1988

Credit card accepted

Customers say: Quick response

"Arrived right on time and reviewed all my electrical needs then went to purchase lightbulbs for me and installed three lighting units instead of just two. I am very impressed with Harris’s services."
Team
Team
Team
Truck
Truck

+8

Response time1 day
443 neighbors recently requested a quote
Recommended by26%of homeowners
Lockhart Construction, LLC
4.1(
57
)
Portable Generator - Repair

Serving Greenville, DE and surrounding areas

Approved

In business since 1980

Free estimates

Emergency services offered

"We hired Jim Lockhart to design and construct our old run down screened porch and make it into a 3 season porch. Jim used excellent communication skills and computer technology to design,explain, and show pictures of the finished product. His 40 plus years of experience were evident when he went over the progress of the project. Cost factor of the project was reasonable and fair. He also, put in two new storm doors and did and excellent job selecting and installing the doors. Jim and his crew go out of their way to make you satisfied. They take great pride in their work and do and excellent clean up job. I highly recommend Jim. His quality of work is as if he is working on his own home and would treat your home as if it was his. Jim and his crew exceeded our expectations. Jim and his crew showed honest communication and trust."
Response time2 hrs
Recommended by96%of homeowners
Avatar for Horizon Services, LLC (DE)
Horizon Services, LLC (DE)
3.8(
1,298
)
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Install+1 more

Serving Greenville, DE and surrounding areas

Approved

In business since 1989

Free estimates

Emergency services offered

Experience The Horizon Difference. \n \nOn-Time Service. Up-Front Pricing. And The Job Done Right and Clean the First Time. GUARANTEED! \n \nHorizon Services is the region's largest and most well respected plumbing, heating and air conditioning company, with nearly 600 employees serving tens of thousands of homeowners throughout Delaware, Southeastern Pennsylvania, Southern New Jersey, and Northeastern Maryland. After a quarter of a century in business, Horizons Services remains fully committed to setting the industry standard for customer service, installation, and focusing on things that are important to busy homeowners: respect for their time, their home and their property; up-front pricing, and an unconditional 100% money back guarantee. \n

Recommended by89%of homeowners
Avatar for Simmz Electrical
Simmz Electrical
5.0(
1
)
Portable Generator - Repair

Serving Greenville, DE and surrounding areas

Approved

Emergency services offered

Small jobs welcome

"Joe from Simmz Electrical was very skilled, charged a fair price and was great to work with. He did a wonderful job, worked very carefully and was very neat. He communicated with us quickly; is very reliable and prompt. We felt comfortable with him in our home; he is now our go to guy for anything electrical. Lucky find"
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Generator Install FAQs, answered by experts

DIY is possible for basic setups. Professional installation ensures safe and proper electrical connections.

No, you should never plug a generator directly into a wall outlet in your house. This practice is extremely dangerous, often illegal, and can cause "back-feeding," where power from the generator flows back into utility lines, creating a life-threatening hazard for utility workers. It can also damage your home's electrical system, including appliances like pumps and HVAC fans. If the main power is restored while the generator is connected, it can destroy the generator and cause an electrical fire. To safely connect a generator, you must use a professionally installed transfer switch or an interlocking kit, which prevents back-feeding by disconnecting your home from the utility grid before the generator provides power.

Here’s what you can run with different wattages and types of generators:

Portable generator:

  • 2,000 watts can handle a large appliance like a freezer or refrigerator, plus a few smaller items like phones or computer chargers. 

  • 4,000 watts will keep two large appliances operating and a few smaller devices.

  • 8,000 watts should power most essential appliances and other devices, including a sump pump, well pump, or your dishwasher.

Partial to whole-house generator:

  • 20,000 watts and above will make it seem like your home’s power is still on.

You can determine what size generator you need for a transfer switch by matching the switch to the largest outlet on your generator. Larger generators can power up to 10 circuits, while most 5,000-watt generators can provide power to six circuits. So, if your generator’s largest outlet is 30 amps, you’ll need a 30-amp transfer switch.

To power a central air system during a power outage, the whole-house generator will need to be at least 5,000 watts, and this number will significantly increase for larger units. Check the specific wattage requirements of your AC unit to choose the right generator size. Consider consulting a generator installer to ensure your whole-house generator meets your electrical load needs.

The Greenville, DE homeowners’ guide to generator installs

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