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Avatar for Power Up Electrical Contractors, LLC
Power Up Electrical Contractors, LLC
4.5(
19
)
Fixed Generator - InstallGenerator - InstallGenerator - Install - For Business+1 more

Serving Jennings, MO and surrounding areas

Approved

Super Service Award Winner

In business since 2011

Free estimates

Emergency services offered

"PowerUp electrical was very professional and came out numerous times to help a strange situation we had with running electric to our hot tub on our new build house. They were very helpful and did not even charge us for the return visits. We really appreciated using a company with such integrity and great work ethic."
23 neighbors recently requested a quote
Recommended by82%of homeowners
Avatar for Hoffmann Brothers
Hoffmann Brothers
3.8(
32
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+1 more

Serving Jennings, MO and surrounding areas

Approved

In business since 1980

Emergency services offered

Warranties offered

"I liked how the company called to update me on the arrival of the electrician. He was on time, professional and got the work done quickly. He listened to my issues and offered several solutions."
Burnt out panel
Burnt electrical panel
Panel replacement
Electrical Panel
Replacement Electrial panel with labeling

+14

Response time10 hrs
1 neighbors recently requested a quote
Recommended by87%of homeowners
Spartan Electric
4.3(
36
)
Portable Generator - Install

Serving Jennings, MO and surrounding areas

Approved

Customers say: Quick response

"Tom from Synergy did the bid for under cabinet lighting install, however sent someone else to do the job. Originally discussed with Tom that he would use a regular converter box inside the cabinet and place a dimmer switch on the wall, but the other guy he sent wasn't aware of this and placed the dimmer converter in the cabinet. This has resulted in us having to use the dimmer switch inside the cabinet instead of on a wall switch -- not what I requested. Also, I discussed with Tom installing an additional outlet in our kitchen during the bid process. After he left I noticed he did not include that on the written bid. The guy he sent didn't know about it either. The outlet was installed however. Overall, I was charged $95 additional over the bid and didn't get exactly what I wanted in regard to the dimmer switch for under cabinet lighting. Both electricians were very nice and professional, but there was definitely a communication problem in regard to the installation of the under cabinet lighting. Perhaps I should have clarified the issue more strongly, or perhaps I didn't understand. Either way, I'm happy with the lighting overall, but not 100%."
6 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for FixPro
FixPro
5.0(
5
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+3 more

Serving Jennings, MO and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

FixPro is a locally owned and operated handyman service proudly serving St. Louis, St. Charles, Lincoln, Warren, Franklin, and Jefferson Counties. We specialize in high-quality home repairs, carpentry, drywall, painting, flooring, deck repair, and general maintenance—handling everything from small fixes to larger improvement projects with precision and professionalism.\n\nWith years of hands-on experience across construction, maintenance, and service industries, I built FixPro to deliver what most contractors don’t: clear communication, reliable scheduling, and work done right the first time. We show up when we say we will, diagnose issues properly, and provide straightforward solutions without cutting corners.\n\nOur approach is simple—treat every home like it’s our own. We focus on clean workmanship, long-term durability, and customer satisfaction. If you want it done right the first time, FixPro is ready.\n\nNeed Something Fixed? Hire a Pro.

1 neighbors recently requested a quote
Avatar for Power Up Electrical Contractors, LLC
Power Up Electrical Contractors, LLC
4.8(
314
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+1 more

Serving Jennings, MO and surrounding areas

In business since 2011

Free estimates

Emergency services offered

"Power Up installed three items. 1. They installed an electric service for our new freezer. 2. They installed a Nest doorbell. 3. The big job was their installing a nine camera security system on our home. Their work was excellent and are always ready to answer any questions before, during, and after installation. I highly recommend Power Up for their excellent work. I would hire again."
Landscape Lighting
Installed outside receptacles.
Hooked-up generator
Installed interior lighting
Installed ceiling fan on porch.

+4

Response time9 hrs
Recommended by97%of homeowners
Avatar for Grasser Electric
Grasser Electric
4.6(
30
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Jennings, MO and surrounding areas

In business since 1975

Free estimates

Emergency services offered

"I had a great experience with them. Their bid was right in the middle where it should have been. The guy who showed up had estimated for 5-6 hours worth of work, and he ended up staying here for almost 9 hours, but they didn't charge me extra for it, and I was happy about that. He was able to run the wiring where I wanted it to run. There weren't all the cables showing and he was able to stick it through my wall, and that is why he ended up staying here for so long. I was really happy with the service. My biggest thing was that the guy stayed until the work was done, he didn't say he would come tomorrow even if it meant working overtime."
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Recommended by92%of homeowners
Showing 1-10 of 36
Generator Install questions, answered by experts

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.

Generators run on a variety of fuel types, ranging from natural gas to solar power. Keep in mind that fuel costs varying by type:

  • Natural gas: $2,000–$21,000 per year 

  • Liquid propane: $2,000–$21,000 per year

  • Diesel: $3,000–$20,000 per year

  • Gasoline: $500–$3,000 per year

  • Solar generator: $2,000–$25,000 per unit

  • Battery backup: $10,000–$25,000 per unit

The average cost to install a home generator is $5,200, but total costs can range from $500 to $18,000 or more. The final price depends on several factors, including the generator's size, type, brand, fuel source, and the cost of labor and assembly. The generator's size is the most significant cost factor, as units that can power larger homes with higher energy demands cost more.

Cost breakdowns by generator type are typically as follows:

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

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

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

To ensure you get the right size unit for your needs without overpaying, consider hiring an electrician to calculate the electrical load of your essential appliances. It is also recommended to get at least three quotes from qualified installers to find the best fit for your budget.

In some situations, yes. Never try to put biofuel into any home generator without checking the specifics first. If a generator has the ability to run on diesel, it can also run pure biofuel (the clear kind made from seed oils, for example). But if you are using biofuel made from animal fats or vegetable oils, the generator will need significant modifications before it can handle a sludgier type of biofuel.

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 Jennings, MO homeowners’ guide to generator installs

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