The cost of solar panels in Herculaneum, MO (2025)

Updated Jun 3, 2025

  • You'll pay an average of $12,765 to install a 5 kilowatt solar panel system in Herculaneum, MO, before incentives.

  • The federal investment tax credit (ITC) lowers that price by 30% of all your solar equipment and installation costs.

Don't overpay for solar in Herculaneum

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Written by:Emily Walker

As of June 2025, the average solar panel system costs $2.55/W including installation in Herculaneum, MO. For a 5 kW installation, this comes out to about $12,765 before incentives, though prices range from $10,850 to $14,680. After the federal tax credit, the average price drops by 30%.

Average price of a 5 kW solar panel installation in Herculaneum, MO

Good Price
$10,850 or less
Market Average
$12,765
High Price
$14,680 or more

You'll probably pay even less than what we show here. It doesn't include the federal ITC or Herculaneum, MO state incentives, which will lower this price by at least a few thousand dollars.

Your solar panel cost depends on your system's size

It may seem obvious but larger solar panel systems cost more money. We use cost per watt ($/W) so you can easily compare quotes, controlling for slight variations in system size.

While a 5 kW system will only cost you $12,765 in Herculaneum, MO, doubling the system size effectively doubles the price, so you'll pay about twice that for a 10 kW system. The higher the price tag, though, the more you'll get back as a credit towards your federal tax bill.

Average solar cost by system size in Herculaneum, MO

System Size
System Cost
System Cost (after ITC)
3 kW$7,659$5,361
4 kW$10,212$7,148
5 kW$12,765$8,936
6 kW$15,318$10,723
7 kW$17,871$12,510
8 kW$20,424$14,297
9 kW$22,977$16,084
10 kW$25,530$17,871

Are solar panels worth it in Herculaneum, MO?

Solar panels are worth it in most areas, including Herculaneum, MO. Certain factors, including the cost of electricity, incentives, climate, and the angle at which the sun hits your roof impact how quickly you break even on your investment relative to other areas around the U.S. 

If you pay for your system with cash, you'll save about $44,705 over 25 years (the warranty term of most solar panels) on electricity costs with a 5 kW system in Herculaneum, MO. We generate this estimate based on real solar quote data from our Marketplace. It considers your system's cost, the federal tax credit, and inflation rates.

Payback Period
10.69 Years
25-Year Savings
$44,705
Cost-per-Watt
$2.55

If you can't shell out $12,765 in cash to pay for solar, don't sweat it. You can choose to finance your system with a loan instead. Some companies even offer $0-down loans so you can start saving on day one if your loan payments are less than your current electric bills. Just keep in mind that your long-term savings will be lower with a loan due to interest rates.

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The numbers we're showing are averages. The price you'll pay for solar depends on many factors unique to you and your home:

If you're looking for solar companies in MO, here are some popular suggestions:

  • Rumos Chem
    St Louis, MO
    Established 2010
    Elite Installer
    Make the Switch Today! Join the growing number of homeowners who are investing in clean, sustainable, and cost-e... 
    Elite Installer
    Screened & Verified
    5.0 /5.0
    108 Reviews

    Make the Switch Today! Join the growing number of homeowners who are investing in clean, sustainable, and cost-e... 
  • SunSent Solar
    St.Charles, MO
    Established 2016
    Elite Installer
    Switch to sunshine with SunSent Solar: - Guaranteed Production: We promise your system will produce what we pr... 
    Elite Installer
    Screened & Verified
    4.9 /5.0
    63 Reviews

    Switch to sunshine with SunSent Solar: - Guaranteed Production: We promise your system will produce what we pr... 
  • Solar City STL
    St. Louis, MO
    Established 2021
    Elite Installer
    Solar City STL is a local, family owned company that has tailored the way we do business to get you the most ince... 
    Elite Installer
    Screened & Verified
    4.7 /5.0
    10 Reviews

    Solar City STL is a local, family owned company that has tailored the way we do business to get you the most ince... 
  • Freedom Solar Pros
    Multi-state
    Established 2011
    Approved Installer
    Our main focus is always on quality, both with equipment used and the installation performed. We offer the best w... 
    Approved Installer
    Screened & Verified
    4.3 /5.0
    9 Reviews

    Our main focus is always on quality, both with equipment used and the installation performed. We offer the best w... 
  • Green Home Systems
    Jefferson City, MO
    Established 1986
    Approved Installer
    Panasonic Elite installer Voted fastest growing company in 2023 by Panasonic. Operating in 20 states across the... 
    Approved Installer
    Screened & Verified
    4.4 /5.0
    47 Reviews

    Panasonic Elite installer Voted fastest growing company in 2023 by Panasonic. Operating in 20 states across the... 

Solar is a major purchase, but you can get the price tag to come down a bit by being an educated shopper. Taking advantage of incentives and rebates and shopping around for quotes can bring down your cost of solar in Herculaneum, MO.

Take advantage of federal and local solar incentives

As long as your federal tax bill is high enough, you can take advantage of the federal tax credit in Herculaneum, MO. This incentive allows you to apply 30% of your solar installation and equipment costs toward your federal tax bill. If the amount exceeds your tax bill, you can roll over the remaining credit to the following year. Many states also offer great local incentives and rebates.

Get quotes from multiple installers

Comparing multiple solar quotes can save you money through competition and transparency. Each additional quote you receive for solar will help you find the right solar panel system at the right price.

This is where EnergySage can help. With funding from the Department of Energy’s SunShot Prize, EnergySage opened the country’s first (and now the largest) marketplace for home solar panel installations. We gather custom solar quotes from local installers on your behalf and put them in an easy-to-compare format. When you compare quotes for solar panels on the EnergySage Marketplace, you can expect to see prices up to 20% lower than if you work with a single solar company.

As of June 2025, the average solar panel cost in Herculaneum, MO is $2.55/W. If you install a 5 kW system it will cost you between $10,850 to $14,680, with an average cost of $12,765.

Why shop with EnergySage?

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