*The Angi rating for Generator Install companies in Marshall, IL is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.
*The HomeAdvisor rating for Generator Install companies in Marshall, IL is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.
Last update on September 29, 2025
Serving Marshall, IL and surrounding areas
Approved
In business since 2018
Emergency services offered
Small jobs welcome
"Josh from Tepen Electrical, was knowledgeable, Professional, courteous and fair. He completed the job (rewire home,outlets,fixtures) within the projected time and budget, while exceeding in quality and efficiency. Thank you Tepen Electrical."
Serving Marshall, IL and surrounding areas
Approved
Super Service Award Winner
In business since 1986
Free estimates
Small jobs welcome
"Had 100 amp breaker replaced with 200 amp and multiple new lines run to the garage and added 100 amp in the garage. They were thorough and efficient and did the work as expected. Very professional and kept us updated if any potential delays and when new issues were found. I highly recommend and would hire again."
Serving Marshall, IL and surrounding areas
Approved
In business since 1969
Free estimates
Emergency services offered
"I was pleased with the installation of the lightning rods--communication was great and the work was done quickly. What I wasn't happy with is he quoted me a price that was less then my actual bill was BUT the price was still less then two other contractors bids."
+70
Serving Marshall, IL and surrounding areas
Approved
Free estimates
Credit card accepted
Offers commercial services
My name is Carson Thrasher. I’ve grown up around the Sullivan area and this is home. I have been around the electrical field for since 2018 when I graduated college. I’ve worked as an electrical engineer for a few years and started my business in 2023. I quit my job in November of ‘25 and am working the business full time. I have five start ratings on Google and strive to maintain a good line of communication with my clients. Honesty and integrity are key in my world and I ensure that as a customer of Amped Up Home Solutions you will receive just that.
Serving Marshall, IL and surrounding areas
Approved
In business since 2009
Free estimates
Emergency services offered
"our phone system is old, but they got the work done! Thanks Joe and the teams!"
Serving Marshall, IL and surrounding areas
Approved
Free estimates
Emergency services offered
Warranties offered
"They came, diagnosed the problem and had it fixed within an hour. Very friendly and professional. Would recomend them to anyone."
Serving Marshall, IL and surrounding areas
Approved
In business since 2019
Free estimates
Credit card accepted
"The crew was the most informative respectful group I have met. They actually wanted to work and listened to what I wanted. I would highly recommend this company. After the bathroom remodel they even stuck around to lay a new kitchen floor that wasnâ  t in the plan."
Serving Marshall, IL and surrounding areas
Approved
In business since 2022
Free estimates
Credit card accepted
Were a locally owned and operated company that values honesty and integrity and treats your We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!\n
Serving Marshall, IL and surrounding areas
Approved
My name is David Michl, and Next Phase Power LLC is built on 20 years of hands-on electrical experience across residential, commercial, and industrial work. From home wiring to underground PVC trenching for services, fuel stations, and farms, I understand how important reliable power is to everyday life.\nProudly serving Jasper County, Effingham, and surrounding communities with dependable service, honest work, and quality craftsmanship. Fully licensed and insured, competitive pricing, and free estimates. Feel free to call or text anytime, and don’t forget to leave a review here or on our Facebook page. Thank you for your support!
Serving Marshall, IL and surrounding areas
In business since 2020
Free estimates
Emergency services offered
"Outstanding job. Their work was fast, neat and very professional. Would definitely hire them back anytime as they went out of their way to ensure I was satisfied with the work."
+46
When maintained properly, a whole-house generator can last up to 20 years. Costs to maintain and repair generators vary by location and type of generator, but you can expect to pay about $150 to $300 per year for annual generator maintenance checks. An experienced generator service technician will inspect your generator’s engine filter, starting mechanism, fuel, lubrication, and coolant levels to keep your generator in good working condition for as long as possible.
Installing a whole-house generator costs about $5,000 on average. Prices range from $1,550 to $8,500, depending on size, brand, fuel type, and assembly. The size of your whole-house generator is the most significant cost factor, with large homes with high energy demands costing the most to power. Types of whole-home generators include:
Portable generators with 1kW–7.5kW capacity: $500–$2,000
Partial generators with 9kW–20kW capacity: $2,000–$6,300
Whole-house generators with 22kW–48kW: $5,000–$18,000
When choosing the right size generator for your needs, consider a few items to help calculate the wattage you’ll need. Start by determining which household items and appliances you want to power, and then add the wattages together. Check out the wattage of these essential appliances:
Refrigerator: 600 watts
Large dehumidifier: 700 watts
Large window air conditioner: 1,400 watts
Water heater: 3,000 watts
Running home appliances like these requires a partial or whole-house generator. A portable generator may be enough to power your home if you only plan to keep a refrigerator and freezer running.
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.
The value of installing a whole-house generator is that your home has guaranteed power, even if the power grid in your area is down. Whether a whole-house generator is worth installing in your home depends on how often you use it, your home’s location, and your lifestyle. For example, installing a whole-house generator is likely worth it if you:
Experience frequent or prolonged power outages
Work from home
Store a lot of cold food
Have a sump pump
Have a pump for well water
Use electronic medical devices
Live in a climate requiring heating or cooling
From average costs to expert advice, get all the answers you need to get your job done.
The average cost of a whole-house generator falls between $5,000 and $25,000. Keep reading to learn how much you can expect to spend.
The cost to install a generator transfer switch depends on several factors. Our guide will help you understand all of the costs.
Natural gas generators are whole-home standby generators that are connected to your home’s natural gas line. The average cost for a natural gas generator is $12,000.
Traditional and inverter generators can provide off-grid or emergency power. Learn the pros and cons of a traditional generator vs. inverter generator.
Whole house generators are a power alternative that can deal with frequent blackouts and other problems. Here’s how they function.
Installing a portable generator can power key appliances during outages. Learn about the best backup generator questions to discuss with a pro.
