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Best generator install pros near Gresham, OR

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

Avatar for ATR Electric
ATR Electric
5.0(
7
)
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Repair

Serving Gresham, OR and surrounding areas

Approved

In business since 2025

Free estimates

Warranties offered

With over 7 years of experience ATR ELECTRIC is your trusted choice for all of your electric needs. Quality is the foundation of every project. As a licensed, independent electrical contractor serving Portland and the surrounding communities, every job is approached with one goal in mind: getting it done right the first time. No shortcuts, no rushed work, and no unnecessary callbacks. Just dependable craftsmanship built to last. Give us a call today for a free estimate!

Kitchen and bath remodel
Kitchen and bath remodel
14 neighbors recently requested a quote
Avatar for John's Waterproofing Co.
John's Waterproofing Co.
4.9(
19
)
Fixed Generator - InstallPortable Generator - Install

Serving Gresham, OR and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1974

Free estimates

Credit card accepted

"Ideal experience with this company! They contacted me and came out to make the bid the same day I contacted them. They were super flexible and worked to accommodate my schedule. I needed to wait until my EV charger arrived from the manufacturer. They came out the day after it arrived, installed the unit in under two hours, and it's been working flawlessly ever since. Don't let their name fool you--John's Waterproofing is expert at electrical work! I will use them again."
Water Puddle
Water Stains on the Walls
Full Perimeter Drainage and wall system
Room for The Home Appliances
Sump Pump and Battery Back up

+36

Response time1 day
Response rate85%
103 neighbors recently requested a quote
Avatar for One Stop Electric LLC
One Stop Electric LLC
5.0(
37
)
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Gresham, OR and surrounding areas

Approved

In business since 2015

Free estimates

Emergency services offered

"As we wanted a ev charger installed, they went out of their way to get us the correct one. They were prompt in installation and courteous in all interactions, fair and reasonable pricing. Would use again for electrical needs."
Kitchen Remodel
Response time10 mins
Response rate100%
4 neighbors recently requested a quote
Avatar for Wind River Electric LLC
Wind River Electric LLC
5.0(
10
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+1 more

Serving Gresham, OR and surrounding areas

Approved

In business since 1996

Free estimates

Credit card accepted

"I am so grateful for this company. Micheal Townley is extremely knowledgeable and professional. He took the time to go through his assessment and upfront pricing. I had an odd electrical problem which lead to a bigger problem that could have been dangerous. After getting an absolutely shocking diagnosis from another company that left me stressed and crying for days, I hesitated to try anyone else but, Micheal put my mind at ease. I sent him pictures ahead of him coming out and he got right to work following further inspection of my electrical panel. I have additional work that will be completed by this company soon. I highly recommend Wind River."
Kitchen upgrades
Kitchen upgrades
Kitchen upgrades
Kitchen upgrades
Kitchen upgrades

+1

2 neighbors recently requested a quote
Avatar for 3 Mountains Plumbing
3 Mountains Plumbing
4.2(
653
)
Portable Generator - RepairFixed Generator - RepairGenerator - Repair - For Business

Serving Gresham, OR and surrounding areas

Approved

In business since 2000

Emergency services offered

Warranties offered

"The whole experience with 3 Mountains Plumbing was outstanding from Nicole at the office to Jon Marc and Peter, the plumbers. They originally scheduled me for an appointment 5 days out, but Nicole watched appointments carefully and moved my appointment to the same day I called. Jon Marc, the plumber, was very knowledgeable and professional. He gave me different options, which allowed me to decide what worked best for me. He even gave me a teacher discount. After installing my water heater at 8:00 p.m. at night, he discovered a manufacturing problem with the water heater. He called another plumber, Peter. Peter was going off shift and was at the office, but got another water heater and brought it to my house so Jon Marc could install it! I think other plumbers would have said that they needed to come back the next day, but Jon Marc stayed until 10:00 p.m. installing the water heater. I will never use another plumbing company because 3 Mountains is the best! Nicole, Peter and Jon Marc... Thank you!"
The 3MP Team (Circa 2017)
Bill Kerrigan
Alex Grabbing a Photo
Rolling Through Lake Oswego
Random Patch Photo

+103

Response time1 day
341 neighbors recently requested a quote
Recommended by91%of homeowners
Grid Electric LLC
New to Angi
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Gresham, OR and surrounding areas

Approved

In business since 2023

Free estimates

Offers commercial services

We invite you to experience a tradition of customer satisfaction that will exceed your greatest expectations. Our professionalism and quality workmanship will accurately reflect your taste and lifestyle. From conception to completion, we work with you until the job is done. We are ethical, honest, and easy to communicate with. \n \nCall us today you'll be pleased you did. Thank you \n

4 neighbors recently requested a quote
Showing 1-10 of 22
Generator Install FAQs, answered by experts

Sizing a generator is a careful process that requires calculating the electrical load of your entire house. You have to take into account every device you want to use and their wattage requirements, plus the wattage needed to start them, and look for a generator that can safely run all that at around 80% capacity.

In more practical terms, a small home can run on a 10,000-watt generator (and if you only want to power a few key appliances, much less than that). A mid-sized home may need something between 15,000 and 22,000 watts. Larger homes require 25,000 watts or more. 

Whole-house generators can run continuously for extended periods, even for weeks at a time (around 400 to 500 hours), as long as they have a sufficient fuel supply. However, this type of extensive use will increase wear and tear and can shorten the generator's overall lifespan. During long periods of operation, it's important to check and refill the engine oil as needed, potentially as frequently as daily depending on the model. If your generator uses a fuel tank, ensure it is kept full to prevent unexpected shutdowns.

You may need a permit for a portable generator if you’ll be installing a transfer switch for your primary residence or similar work. Otherwise, a permit for other uses may not be necessary. Check your local building codes or ask a local generator installer for more information about your local regulations.

As a safety measure, you should always turn off the main breaker while operating your generator’s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.

Many services include assembling the unit and securing it in the window. Confirm with your provider.

The Gresham, OR homeowners’ guide to generator installs

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