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Avatar for Great Northern Power LLC
Great Northern Power LLC
5.0(
6
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+1 more

Serving Fort Harrison, MT and surrounding areas

Approved

In business since 2024

Free estimates

Emergency services offered

Great Northern Power LLC is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over 12 years of hands on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today!

15 neighbors recently requested a quote
Avatar for Montana Power Solutions, LLC
Montana Power Solutions, LLC
New to Angi
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business

Serving Fort Harrison, MT and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

I've been working in the electrical industry since 2017 and am a licensed Master Electrician and Generac Service Dealer. Montana Power Solutions serves Helena and surrounding communities, with the ability to travel throughout the area for generator and electrical projects. My specialties include Generac generator installation, maintenance, troubleshooting, warranty service, electrical repairs, panel upgrades, and new construction. I take pride in quality workmanship, honest communication, and doing the job right the first time. My goal is to provide homeowners with dependable electrical and generator solutions they can trust when they need them most.\n

5 neighbors recently requested a quote
Avatar for RB Electric, LC
RB Electric, LC
5.0(
21
)
Portable Generator - Install

Serving Fort Harrison, MT and surrounding areas

In business since 2015

Free estimates

Warranties offered

"Review by Charles S. Bob was very professional and made time for our needed repair. We were surprised at his low cost and high professional knowledge and actions. We would highly recommend him for any electrical service."
BreakerPanBefore2
BreakerPanAfter2
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ServiceBefore

+4

Recommended by100%of homeowners
Avatar for Power Block Electric, LLC
Power Block Electric, LLC
5.0(
1
)
Fixed Generator - Install

Serving Fort Harrison, MT and surrounding areas

In business since 2006

Free estimates

Offers commercial services

"He's very fastidious, detail oriented, and clean electrician. Super friendly and extremely responsive when you have questions. Very reasonably priced and incredible value for the level of service he provides. Knowledgeable, and seems like he could do pretty much anything!"
Response time10 hrs
Recommended by100%of homeowners
Armko Construction and Electric
New to Angi
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Fort Harrison, MT and surrounding areas

In business since 2008

Free estimates

Armko Construction and Electric, has over 20 years of experience. We pride ourselves on quality work and friendly service. We always strive to make sure we keep everything organized, clean and our scheduling as convenient for you as possible. We do free estimates and always do our best to work with you to ensure you get exactly what you want out of your home. We are always professional, honest and up front about all costs, no hidden fees. Every job always has a custom feel, built with your thoughts and needs in mind. We have the knowledge to show you some options and to make helpful suggestions to generate new ideas. We look forward to working with you in the future and bringing out the full potential in your home.

Response time2 days
GGC. Shane Gray
New to Angi
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Install+1 more

Serving Fort Harrison, MT and surrounding areas

In business since 1992

Free estimates

Emergency services offered

I am a professional person that takes great pride in my work, in a neat and orderly Fashion. That goes above and beyond the call of work to satisfy the customers needs, from the smallest to the largest jobs.\nRanging from residential electrical repair, new and existing to home improvement and remodeling projects.

Bosch electrical services
New to Angi
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Install+1 more

Serving Fort Harrison, MT and surrounding areas

In business since 2023

Free estimates

Emergency services offered

Bosch E Services Llc 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.

Generator Install questions, 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.

Generators are safe to use as long as they are installed and operated correctly according to the manufacturer's recommendations. The most critical safety tips are to never use a portable or fuel-powered generator inside an enclosed space due to the risk of lethal carbon monoxide poisoning; always operate it outdoors where fumes can dissipate away from your home. Additionally, never attempt to connect a generator to your home’s electrical panel yourself—hire a professional to ensure the setup meets safety standards. Finally, avoid overloading the generator by not connecting more appliances than it is rated for, as this can damage your equipment or cause a fire.

The cost to install a whole-house generator averages $5,200, with a typical price range of $1,500 to $8,900. However, total costs can vary from $400 for a small portable unit to over $18,000 for a large-capacity system. The most significant cost factor is the generator's size and capacity, but other variables include the brand, fuel type, and labor for assembly and installation.

Generator costs can be broken down by type:

  • Portable or Emergency Backup Generators (1kW–7.5kW): $500 to $2,000

  • Partial-Home Generators (9kW–20kW): $2,000 to $6,500

  • Whole-House Generators (22kW–48kW): $5,000 to $18,000

To avoid paying for more power than you need, consider hiring an electrician to calculate the electrical load for your essential appliances. It is also recommended to get at least three quotes to find the best deal for your specific needs and budget.

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.

If you’re wondering if you can use your electric vehicle as a backup battery, it depends on whether your EV is compatible with bidirectional charging. This technology allows energy to flow both ways, enabling vehicle-to-home (V2H) backup power, vehicle-to-load (V2L) for appliances and camping, and vehicle-to-grid (V2G) to support the power grid. Compatible EVs convert stored DC energy into usable AC power, helping reduce energy costs and enhance grid stability while providing emergency backup power.

The Fort Harrison, MT homeowners’ guide to generator installs

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