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Avatar for Generator Supercenter of Maine
Generator Supercenter of Maine
4.6(
39
)
Fixed Generator - InstallGenerator - Install - For Business

Serving Greene, ME and surrounding areas

Approved

In business since 2020

Free estimates

Credit card accepted

"Diagnosed the problem and repaired my generator so it starts and runs well. I will be using them from now on for all of my generator service in the future. They are a first class company."
Generator Install
18KW Installation
Preparation for the day
Photos
Response time2 days
Response rate93%
85 neighbors recently requested a quote
Generators of Maine, Inc.
5.0(
5
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+1 more

Serving Greene, ME and surrounding areas

Approved

In business since 2014

Free estimates

Offers commercial services

"Generators of Maine just completed the installation of a 14kw generator with parallel transfer switches, to protect 2 separate metered panels at a rental property that I own. I didn't even know that this was possible, until Doug Sawyer suggested it. The incremental cost of protecting the additional panel with the parallel transfer switch arrangement was a fraction the cost of an additional generator and transfer switch. Throughout the job, Doug and his crew were awesome. I am a terrible snoop who enjoys technology, so I hung around just watching and learning. They didn't seem to mind my presence and were friendly and informative through out the install. Every aspect of the job was 100% top-notch. Doug also managed to under bid his nearest competitor on every component and aspect of the job, including the annual maintenance contract, which I deemed to be worth the $$$. I highly recommend Generators of Maine."
Response time4 hrs
Recommended by100%of homeowners
Avatar for Parker Electric LLC
Parker Electric LLC
5.0(
14
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+2 more

Serving Greene, ME and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Small jobs welcome

"Noah exceeded my expectations at a competitive price . Clear communication, and fast! His estimate was spot on and it was clean and professional work. Noah did a 60amp sub panel install for my new garage, and also wired in four new outlets in my basement as I only had one down there. Thanks Noah, I recommend him to family and friends every chance I get and I always get positive feedback from the recommendation"
Generator Install
Response time9 hrs
Response rate90%
12 neighbors recently requested a quote
Avatar for Merrymeeting Electrical Service
Merrymeeting Electrical Service
4.7(
55
)
Portable Generator - Install

Serving Greene, ME and surrounding areas

Approved

In business since 2002

Small jobs welcome

Customers say: True professional

"Mike took on wiring hookup of complete, electrical controller system for new in-ground pool Pump, Heater, Lighting, Chemical Generation systems. My original electrician passed away unexpectedly having started project some of his work was not to Code. Mike being very professional explained that he would need to change out some of his work. With minimal directions provided by Local Pool Company Mike installed all the component controllers for the Hayward Omni System in accordance with local code requirements. He is very neat in his work, prompt to schedule and I would highly recommend his services."
Merrymeeting Electrical
11 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Solid Ground Electrical Inc.
Solid Ground Electrical Inc.
4.8(
21
)
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Install

Serving Greene, ME and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

"Not only did the electricians promise to come to install the stovetop as soon as it came in, they came a few days after we first made contact to see what the work would entail and agreed to dispose of the cracked stovetop for us. They kept their promise by coming the day after the stovetop came in, worked efficiently and made sure it worked properly before leaving. My husband and I were extremely impressed with their work."
14 neighbors recently requested a quote
Avatar for Casco Bay Generators LLC
Casco Bay Generators LLC
5.0(
5
)
Fixed Generator - InstallFixed Generator - Repair

Serving Greene, ME and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

We are proud to be a Veteran-operated, Titanium Level Kohler® licensed and insured generator dealer. We teamed with Kohler® to give you peace of mind that you are working with a dealer-trained, factory-authorized provider to handle these appliances. We offer all Kohler® and Generac warranties and maintenance services. These are the industry’s best products for backup protection at your home or office.\nWe are also proud to work with Efficiency Maine, offering discounts, rebates, loans, and other initiatives to promote high-efficiency equipment that help Maine’s homes and businesses reduce their energy costs and lower their greenhouse gas emissions.\nProfessionally installing a standby generator and/or heat pump for your home or business is one of the best investments you can make. .\nWe at Casco Bay Generators & Heat Pumps keep the power on 24 hours a day, 365 days a year.

Standard installation.
Response time2 days
15 neighbors recently requested a quote
Avatar for Origin Energy, LLC
Origin Energy, LLC
4.6(
11
)
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Greene, ME and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Warranties offered

"“I had an exceptional experience working with Origin Energy. Their team demonstrates the highest level of professionalism and a strong work ethic. They are not only knowledgeable and efficient but also consistently go above and beyond to ensure customer satisfaction. Every interaction was seamless, and their dedication to providing quality service was evident at every step. I highly recommend Origin Energy for their reliable, hardworking, and professional approach to business!”"
Completed system
First half of panels
First half progress
Response time2 days
Response rate88%
22 neighbors recently requested a quote
Showing 1-10 of 37
Generator Install questions, answered by experts

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.

Natural gas and electricity rates vary significantly based on location, and pricing can change over time, too. It’s possible that in locations where natural gas is particularly inexpensive, it will cost less than grid-based electricity will. However, you should also factor in the generator’s initial costs and maintenance needs, as well as its noise level and if it can comfortably power all your home appliances.

In most municipalities, you will need a permit to install a permanent home generator, including emergency backup, partial-home, and whole-home generators. A permit for a generator usually costs between $50 and $250, depending on where you live. Your electrician or certified generator installer will usually pull the permit for you—and might be required to do so by your building department—but you’ll be on the hook for the cost of the permit. You should ask your installer before agreeing to any work if they will pull the necessary permits for your project.

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.

In many cases, yes. There are models called dual-fuel generators and fuel switches, but only between certain types of fuel. For example, with the right setup you can convert a generator from natural gas to propane. Some allow switching between diesel and gasoline. There are even tri-fuel generators available in some cases, which adds a large layer of security if you are worried about fuel availability in times of crisis. Always check your generator capabilities and manual instructions before trying to switch fuels. Some generators can use another fuel but may need a fuel conversion kit to prep them first.

The Greene, ME homeowners’ guide to generator installs

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