See what a solar system costs installed in St. Louis, sized from your power bill. Free, instant, no sign-up.
Updated · installer rankings recalculated
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| System | Installed cost |
|---|
StraightUp Solar
4.8 · 43 reviews · Free quote
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Astrawatt Solar
5.0 · 21 reviews · Free quote
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EFS Energy
4.5 · 23 reviews · Free quote
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An estimate, not a quote. Based on $2.12–$2.86 per watt installed in Missouri and 1,433 kWh per kW a year in Missouri. Installers confirm the final price after a roof check.
Ranked by TrustAnalytica from verified reviews · see the full Top 10 list →
Known for handling every step of solar installations with care and clear communication, StraightUp Solar brings over 15 years of local experience to residential and commercial projects across Illinois and Missouri. Their team manages design, permits, and installation while keeping customers informed throughout. Reviews highlight their professionalism and thoroughness, though their pricing can be… more...
Known for handling every step of solar installations with care and clear communication, StraightUp Solar brings over 15 years of local experience to residential and commercial projects across Illinois and Missouri. Their team manages design, permits, and installation while keeping customers informed throughout. Reviews highlight their professionalism and thoroughness, though their pricing can be higher than some competitors.
Astrawatt Solar emphasizes educating homeowners to help them make informed decisions about solar energy. Their team handles everything from sales and permitting to installation, with customers noting clear communication and professional, friendly service. Some mention minor hiccups during installation, but appreciate the company’s prompt follow-up to resolve issues.
Known for customized solar panel installations for homes, farms, and businesses, EFS Energy focuses on helping clients achieve energy independence through clean, renewable power. Their team handles design, installation, and coordination of permits, with many customers appreciating their professionalism and thorough communication. Some reviews mention delays and warranty service challenges.
Helio GreenTech offers a turnkey, maintenance-free solar system with a 25-year warranty covering all components and labor. Their NABCEP-certified team guides homeowners through the decision process using up-to-date tools and personalized assessments. Customers appreciate their knowledgeable, friendly approach and clear communication throughout installation and beyond.
Known for their expertise in solar energy and LED lighting installations for commercial properties, Exceptional Energy Solutions helps businesses upgrade with smart, cost-efficient systems. Their team handles everything from electric vehicle charging stations to tailored lighting solutions, with clients appreciating their professionalism and smooth project execution. Some note a preference for… more...
Known for their expertise in solar energy and LED lighting installations for commercial properties, Exceptional Energy Solutions helps businesses upgrade with smart, cost-efficient systems. Their team handles everything from electric vehicle charging stations to tailored lighting solutions, with clients appreciating their professionalism and smooth project execution. Some note a preference for more cautious health practices during visits.
Specializing in solar generators and custom solar solutions, Solar Luxury LLC handles everything from off-grid and grid-tied installations to solar setups for RVs, agriculture, and outdoor lighting. Customers appreciate the team’s clear communication, creative problem-solving, and reliable work, though some projects may involve coordinating with other contractors.
With over 50 years of combined experience in the energy sector, Solis Energy Services specializes in residential and commercial solar energy solutions, including energy evaluations and system installation. Customers appreciate the team’s knowledge and clear communication during the sales process, though some note follow-up after installation can be inconsistent.
Solar City STL offers solar design and installation for both residential and commercial properties, helping customers reduce their energy bills with clean, renewable power. The team guides clients through the process, including coordination with Ameren Missouri, and many appreciate their clear communication and smooth installations. Some find the initial decision to switch takes time, but the… more...
Solar City STL offers solar design and installation for both residential and commercial properties, helping customers reduce their energy bills with clean, renewable power. The team guides clients through the process, including coordination with Ameren Missouri, and many appreciate their clear communication and smooth installations. Some find the initial decision to switch takes time, but the results often speak for themselves.
Specializing in ground and residential solar mounts, BKJ Solar handles full installations, upgrades, repairs, and maintenance for home solar systems. The team also installs solar awnings and carports and offers battery storage solutions. Customers appreciate their responsiveness and thorough project management throughout installation and beyond.
Azimuth Energy offers affordable energy solutions to businesses, which improve their financial performance as well as climate sustainability. Our team is made up of skilled engineers and builders who can help clients build solar-energy and energy storage projects. This will reduce their fossil fuel consumption and lower OpEx. It also helps improve financial performance, property value and fight… more...
Azimuth Energy offers affordable energy solutions to businesses, which improve their financial performance as well as climate sustainability. Our team is made up of skilled engineers and builders who can help clients build solar-energy and energy storage projects. This will reduce their fossil fuel consumption and lower OpEx. It also helps improve financial performance, property value and fight climate change.
Our ground built solar system was commissioned on March 29, 2022 and has worked less than 6 weeks consecutively. Yes, you read that correctly. EFS HAS been out to our home many times and every time they leave it is not fixed. Many times a different problem exists. It is beyond frustrating to not onl…
| # | Business | Rating | Reviews | Starting price | Phone | Website |
|---|---|---|---|---|---|---|
| 1 | StraightUp Solar | 4.8 | 43 | $100 | (314) 218-2663 | Visit |
| 2 | Astrawatt Solar | 5.0 | 21 | $50 | (877) 937-4786 | Visit |
| 3 | EFS Energy | 4.5 | 23 | $50 | (314) 771-5131 | Visit |
| 4 | Helio GreenTech | 5.0 | 17 | $200 | (866) 435-4648 | Visit |
| 5 | Exceptional Energy Solutions | 4.7 | 13 | $200 | (314) 899-8886 | Visit |
| 6 | Solar Luxury LLC | 5.0 | 8 | $100 | (314) 337-7071 | Visit |
| 7 | Solis Energy Services | 3.7 | 9 | $100 | (800) 262-1101 | Visit |
| 8 | Solar City STL | 5.0 | 6 | $50 | (636) 515-4895 | Visit |
| 9 | BKJ Solar | 5.0 | 5 | — | (314) 899-5527 | Visit |
| 10 | Azimuth Energy | 3.0 | 2 | — | (636) 717-8484 | Visit |
This calculator sizes a solar system from your electricity use. Your monthly bill, divided by the average Missouri electricity price, gives your yearly use; Missouri's sunshine (1,433 kWh per kW of panels a year) then gives the system size that covers it, adjusted for roof direction and shade. The installed price is that size multiplied by the price per watt homeowners in Missouri pay installers. Payback compares that price with what the panels save at Missouri power prices, assuming prices rise 3% a year.
An estimate, not a quote. Roof size and pitch, shading, equipment, permits and the installer all change the final price; installers confirm it after a site visit. Sources: EnergySage state installed-cost data (2026), NREL PVWatts, U.S. Energy Information Administration residential prices (2026), state program pages.