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Best 5 Solar Companies in O'Fallon, MO

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Written By Max Peterson|Last Updated: February 05, 2024

O'Fallon homeowners are increasingly using solar panels to power their homes and heat their water. While switching to solar energy comes with upfront costs, local homeowners could ultimately save $810 per kilowatt on their electric bills. A professional technician can help you select the best panels to maximize your savings. On this page, we'll show you O'Fallon's best solar providers and offer expert advice for your solar journey.

Best High-Efficiency System
  • Builds custom, high-efficiency solar systems suited to each home
  • Extensive coverage area throughout the country
  • Offers energy storage and EV charger add-ons
Most Reputable
  • Offers high-efficiency panels and storage options
  • Provides unique in-house financing options
  • Recognized as one of the most reputable solar companies

Top O'Fallon Solar Companies

Helio Solar Power, LLC. Logo

Helio Solar Power

Based on 27 customer reviews.

Services Offered

Skilled RepairsCleaning And MaintenanceSolar CarportsBattery StoragePanel InstallationFinancing Assistance


  • Prompt service delivery
  • Informative resources
  • Reliable customer support
119 S Main St, St Charles, MO 888-424-3546 heliosolarpower.com
StraightUp Solar of St. Louis Logo

StraightUp Solar of St. Louis

Based on 55 customer reviews.

Services Offered

Cleaning And MaintenanceFinancing AssistanceBattery StoragePanel InstallationConsultationGrid-Tied Solar System


  • Clear pricing policy
  • Informative resources
  • Free quotes
11696 Lilburn Park Rd, St. Louis, MO 314-218-2663 straightupsolar.com
EFS Energy Logo

EFS Energy

Based on 31 customer reviews.

Services Offered

Financing AssistancePanel InstallationConsultationCleaning And Maintenance


  • Reliable customer support
  • Informative resources
  • Clear pricing policy
1283 Research Blvd, St. Louis, MO 314-771-5131 efsenergy.com
Astrawatt Solar Logo

Astrawatt Solar

Based on 35 customer reviews.

Services Offered

Permit AssistancePanel InstallationBattery StorageTesla PowerwallConsultation


  • Clear pricing policy
  • Informative resources
  • Free quotes
222 S Meramec Ave Suite 202-1100, St. Louis, MO 877-937-4786 astrawatt.solar

More Local Solar Companies

Streib Company

User Reviews: 5/5 

9225 Watson Industrial Park
St. Louis, MO 63126

Route 66 Solar

User Reviews: 4.6/5 

2110 Troy Rd Suite B1
Edwardsville, IL 62025

Pyramid Electrical Contractors, Inc.

User Reviews: 4.1/5 

300 Monticello Pl
Fairview Heights, IL 62208

To share feedback or ask a question about this article, send a note to our Reviews Team at reviewsteam@thisoldhousereviews.com.

Ranking Methodology

Our team used the following criteria to determine the best O'Fallon solar companies.

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Facts about O'Fallon
Average Max Temp:65°F
Solar Payback Period:11.3 years
Average Daily Sunlight:55%
Homes Powered by Solar:246
Average Annual Energy Bill:$1,291
Solar Power per Capita Percentile:48.0%

Expert Tips By

This Old House empowers homeowners with the knowledge and tools they need to tackle various projects and navigate the complexities of homeownership.

Benefits of Solar Energy

Solar energy offers several advantages that will enhance your home for years to come.

  • Lower utility costs: Generating some or all of your own power will cut power costs long-term.
  • Better energy independence: Solar systems with battery backups work through power outages and emergencies, and you won't have to rely on the grid for your safety and comfort.
  • Reduced carbon footprint: The sun is the universe's most abundant clean energy source, meaning you can minimize or conquer your home's dependence on "traditional" sources.

What Solar Incentives Are Available to O'Fallon Homeowners?

Missouri's public agencies and power companies offer a range of solar incentives to help cut your solar system costs. Check out a breakdown of eligible solar programs where you live.

Incentive Type: Rebate Program

Website: powermoves.com

Incentive Amount:

Dual Fuel Heat Pump: $500
Variable Speed Pool Pump: $250
Air-Source Heat Pump: $250 - $750
Geothermal Heat Pump: $1,500
Heat Pump Water Heater: $400/unit
HVAC: Varies depending on ZIP code. See program website

Incentive Type: Rebate Program

Website: central.libertyutilities.com

Incentive Amount:

$0.25 per watt for systems operational between July 1, 2019, and December 31, 2023

Incentive Type: Property Tax Incentive

Incentive Amount:

100% exemption

Incentive Type: Rebate Program

Website: ameren.com

Incentive Amount:

Air-Source Heat Pump: $500-$900
Ductless Air-Source Heat Pump: $300-$500
Dual Fuel Heat Pump: $175-$200
Ground Source Heat Pump: $800-$2,000
Central Air Conditioner: $300-$500
Electronically Commutated Motor (ECM): $50-$100
Air Conditioner/Heat Pump Tune-Up: $75

Incentive Type: PACE Financing

Incentive Amount:

Financing contracts limited to 20 years or less; improvements must display a positive economic benefit over the life of the contract.

Incentive Type: Rebate Program

Website: cuivre.com

Incentive Amount:

Water Heater: $50
Ground-Source Heat Pumps: $750/ton
Ground-Source Heat Pump Replacement: $150/ton
Dual Fuel Heat Pumps: $150/ton
Basement/Crawl space/slab insulation: 50% of installed cost
Advanced Thermostat: 50% of installed cost
Heat Pump Water Heater: 50% of installed cost
Window Air Conditioning: 50% of installed cost
Business Lighting Rebate: Varies, visit program website or contact utility for details

Incentive Type: Personal Tax Credit

Website: ecowatch.com

Incentive Amount:

30% federal tax credit for systems placed in service after 12/31/2021 and before 01/01/2033. Good for: solar water heat, solar photovoltaics, biomass, geothermal heat pumps, wind (small), fuel cells using renewable fuels.

How To Choose the Best Solar Company in O'Fallon

The purchase price and effectiveness of solar panels often rely on which company installed them. Consider all of these criteria in your service provider search.

Licensing and Training

In Missouri, cities and counties have the right to issue contracting licenses. However, all contractors must register with the Missouri Secretary of State. You should also visit a company's website to learn about its private credentials. Two of the most prestigious are the Solar Heating Installer and PV Installation Professional certificates, backed by the North American Board of Certified Energy Practitioners (NABCEP). Some companies don't publish this information online, so you should also ask your estimator about them.

Cost of Solar Panels in O'Fallon

Different solar panel types look and perform differently. Monocrystalline panels offer the best energy production but cost more than other options. Polycrystalline panels provide a lower price point but produce less power. Thin-film panels work well for small projects like RVs and sheds, but they're not ideal for larger installations due to their low performance.

Additional components, such as electric vehicle (EV) chargers and battery storage, will add to your overall costs. However, they might make your solar system more efficient and convenient to use. Not every solar provider offers these add-ons, so look for a contractor that sells them if it's crucial for you.

Most O'Fallon homeowners select solar systems sized for five kilowatts (kW) of electrical capacity. These systems cost about $16,850 to set up, considering both materials and labor. You can see more specific cost information in the table.

Solar Panel CostAverage Cost
Solar Monocrystalline$1,141
Solar Polycrystalline$890
Solar Battery$731
Solar Home EV Charger$2,739

Financing Solar Energy in O'Fallon

Choosing the ideal financing plan will influence your overall solar system cost and potential savings. Common payment options include loans, power purchase agreements, cash payments, and leases. Though it involves a large up-front payment, cash is the most economical choice because it doesn't accrue interest and qualifies you for incentives. Solar loans are the next best option. As with a car loan or mortgage, you'll pay a monthly rate towards system ownership, including interest. You can still apply for money-saving solar incentives, and depending on your lender, you could put as little as $0 down. Solar leases allow you to rent your panels for a fixed monthly rate, while PPAs let you pay just for the energy you use, akin to an electric bill. Both options disqualify you for solar incentives and do not provide you system ownership. Solar experts generally don't recommend them, but they might be suitable in some cases. We advise working with a provider that offers multiple financing options. Speak with each agent about what's available, and obtain more than one estimate for the best odds of staying within your financial plan.

The table below lists the average payback periods for different capacities of solar systems in O'Fallon.

A 26% federal tax credit applies to new residential solar equipment purchased through 2032. Further incentives may be available through local governments, usually in the form of rebates and special financing programs.

Solar System CapacityEstimated Payback period
1 kW2.3 years
2 kW4.5 years
5 kW11.3 years
10 kW22.7 years

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Frequently Asked Questions About Solar in O'Fallon

How much money could I save by going solar in O'Fallon?

On average, O'Fallon homeowners shell out roughly $1,291 per year on energy bills. Once you repay your solar array, you could reduce your costs by $809.62 per kilowatt you produce.

Is solar energy readily available in O'Fallon?

Yes, solar energy is gaining popularity in O'Fallon. Some homes already benefit from solar power on-site or through utility grids, and they're fortified by a state solar economy with 2647 workers and counting.

Should I expect a property value increase after switching to solar energy?

Yes, a solar PV system will raise your property value. According to the National Renewable Energy Laboratory (NREL), for every dollar you save on energy bills, your home value rises by $20. So, if your panels save you $600 per year on energy costs, your property could appreciate $12,000.

What if I live in a rainy or dark

Solar panels could still work well in cloudy conditions. Your installer will position your panels to absorb the most sunlight possible. They might also recommend a back-up power source to keep your system functioning at its best.

How do I care for my new solar system?

Solar panels don't require much upkeep to keep working well. All you'll need to do is clean and inspect the panels every six months or as necessary in dusty seasons. Solar installers frequently offer maintenance packages to help you in your system's care.

What's the average solar system size in O'Fallon?

A typical O'Fallon solar home uses a 7.2-kW panel array, but you might need a bigger system if your energy needs are more demanding. Solar professionals will evaluate your property's power usage and roof shading to recommend the appropriate system for you.

What are some "red flags" to watch for as I research companies?

Even the most renowned O'Fallon solar providers will have both glowing and negative reviews. To make the most informed decision possible, focus on these warning signs to know if a company isn't worth your investment:
  • High-pressure sales tactics
  • Not being straightforward about references, warranties, training and credentials and cost
  • Inflexible options
  • Rushing through the site assessment
  • More mixed or negative reviews than positive ones

What's the difference between a PPA and traditional financing?

A power purchase agreement is a contract between you and your installer. They install, own, and maintain the panels, and you purchase the generated electricity from them for 10–25 years. There will usually be options to extend the agreement and buy out early to own your system.

In contrast, solar loans can come from specialty lenders, installer, the government and local banks. You'll need to pass a credit check to qualify for most of them. While the upfront costs are more expensive, and you'll be responsible for maintenance, you'll also have total ownership and can apply for many more benefits.

To share feedback or ask a question about this article, send a note to our Reviews Team at reviewsteam@thisoldhousereviews.com.