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  • Average homeowner rating star icon4.3
    Average homeowner rating
  • Verified reviews icon13
    Verified generator installs reviews

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

Avatar for Bailey & Shipp Electric
Bailey & Shipp Electric
4.1(
82
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+1 more

Serving Mayo, MD and surrounding areas

Approved

In business since 2011

Free estimates

Emergency services offered

"Your technician that came out to do a yearly maintenance inspection on my generator was very nice and knowledgeable. He arrived actually earlier than expected and went right to work. I would recommend your company to anyone and it was so nice to deal with someone who acted like they enjoyed their work and wanted to please. Thank you!"
3 recessed lights
Single Recessed Light
Custom Bathroom Wiring
chandelier
Panel Replacement After

+8

Response time10 hrs
5 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for Duke's Electrical Services, Inc.
Duke's Electrical Services, Inc.
4.9(
310
)
Portable Generator - Install

Serving Mayo, MD and surrounding areas

Approved

In business since 2001

Free estimates

Emergency services offered

"I hired them to come and install an exhaust fan as well as a thermostat. After realizing my hvac system also had a humidifier function that was incompatible with the thermostat I bought they were able to properly install my exhaust fan (I bought the wrong kind as well) and hung a chandelier under two hours. Very efficient and fair pricing."
Recess light install
Recess and fan install
Recommended by90%of homeowners
Avatar for Critical Peake Services, LLC
Critical Peake Services, LLC
5.0(
5
)
Fixed Generator - InstallGenerator - Install - For Business

Serving Mayo, MD and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

Critical Peake is a full-service commercial and residential electrical contractor serving the\nMid-Atlantic. We handle projects of every size. Our licensed, bonded, and insured team\nprovides scheduled electrical service and 24/7 emergency support. We deliver safe,\npractical solutions with clear communication and responsive support. With more than 100\nyears of combined leadership experience, we serve homes, businesses, multi-family\ncommunities, and public facilities. Our work ranges from repairs, maintenance, and system\nupgrades to tenant fit-outs, backup power, lighting, security, EV charging, and design-build\nconstruction. We build long-term relationships by staying responsive before, during, and\nafter each project.

Old panel, before
Old panel wiring
Inside old panel
New 42-space panel
Finished new panel

+15

3 neighbors recently requested a quote
Technician Engineers Group
3.7(
15
)
Generator - Install - For Business

Serving Mayo, MD and surrounding areas

Approved

In business since 1996

Offers commercial services

Customers say: Quick response

"Anthony and his team do expert electrical work of all kinds. We are a 145 year old non-profit organization with buildings and grounds, and have contracted with Technician Engineers Group (TEG) on two large projects (and several small ones) over the last 15 years. One project rewired a large 125 year old building listed on the National Register of Historic Places, and one installed an extensive outdoor lighting system. In these two unusual situations TEG worked closely with us to find innovative solutions to our unique needs. We are very pleased with the results, enjoyed their can-do approach, and highly recommend this company for any electrical challenge. We found TEG reliable, honest, on time, and all the work was completed ahead of schedule."
4 neighbors recently requested a quote
Recommended by53%of homeowners
Calvert Generator
New to Angi
Generator - Install - For Business

Serving Mayo, MD and surrounding areas

Approved

In business since 2021

Free estimates

Credit card accepted

Calvert Generator is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business. \n

Response time10 hrs
Avatar for Callahan Electric
Callahan Electric
4.9(
32
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Mayo, MD and surrounding areas

In business since 1999

Free estimates

"Callahan worked me in during a busy week before the 4th even though it was a cold call. I did not know him.. The electrician was exactly on time at 8AM and he wore a mask. He did a perfect job, and went out of his way to make the wire out of site as it was installed across my garage.. Even though it took a little longer than anticipated, he still charged me the quoted price.. I will definitely call him again for all my electrical work."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+14

Recommended by100%of homeowners
Avatar for Ethridge Electric & Generator Services
Ethridge Electric & Generator Services
4.8(
33
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Repair - For Business

Serving Mayo, MD and surrounding areas

In business since 1995

Free estimates

Emergency services offered

"Ron Ethridge has been our Electrician of chose for the past three years. I started out using Ron to service my generator after the warranty lapsed. Heâ  s provided that big company expertise with that small organization connection. Since that time Ron and his team have provided electrical services for our entire home. I feel comfortable leaving Ron in our home while weâ  re away which is a huge feat for me particularly. Iâ  m grateful for the service that Ron and his team continues to provide to our family."
Panel Change/Heavy Up
Panel Change/Heavy Up
Panel Change/Heavy Up
Recessed Lighting
Recessed Lighting

+1

Response time2 hrs
Recommended by100%of homeowners
Avatar for Walsh Electric
Walsh Electric
5.0(
8
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Mayo, MD and surrounding areas

In business since 2016

Free estimates

Emergency services offered

"They were fantastic. Really good price. They were on time, came in and did the work. Cleaned up after themselves. They noted some other concerns that we were able to look into and they came up with a solution that worked within the limitation on my home."
Recommended by100%of homeowners
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Generator Install FAQs, answered by experts

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.

If you’re wondering whether gas generators produce carbon monoxide, know that natural gas generators do not produce carbon monoxide if they are functioning properly, as natural gas burns cleanly. However, if the generator malfunctions and the gas does not burn completely, there is potential for carbon dioxide to be produced. To prevent malfunctions, it's crucial to perform regular maintenance, including running the generator weekly and scheduling professional inspections every 6 to 12 months. Also, be sure to test your carbon monoxide detectors regularly to ensure they function in the rare case of the generator producing carbon monoxide.

Portable generators provide backup power for essential appliances during outages and are easy to relocate.

Natural gas generators are designed to run for extended periods of time, such as power outages during a natural disaster. Since there’s no limit to the supply of natural gas, they don’t need to stop for refills. However, generators do need maintenance, including pauses to check and add oil. Constantly running them will also cause a lot more wear and tear, leading to a shorter lifespan.

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 Mayo, MD homeowners’ guide to generator installs

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