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Sustainable Energy Systems LLC

Sustainable Energy Systems, based in Frederick, Maryland, is a locally grown, family-owned business that has been operating since 2008. We provide turn-key residential and commercial solar installations that are constructed using the industry’s most trusted products and methods.

SES has installed thousands of organically developed solar projects throughout the Mid-Atlantic, which makes us one of the most experienced installers in the region. We have been fortunate to install for some of the largest solar companies in the U.S. to include SunRun, SolarCity, and Sungevity. This has allowed us to become experts in multiple installation techniques and components; expertise that we will bring to your project!
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About Sustainable Energy Systems LLC

Sustainable Energy Systems offers sales, design, engineering, procurement, installation, and commissioning services.

We also offer multiple options to go solar including cash purchase, financing, lease and power purchase agreements.
Year Established
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Reasons Why You Should Work With Us
  1. Installing since 2008, We are one of the oldest and most trusted installers in the Mid-Atlantic Region.

  2. We want our clients to get the best possible value from their solar so we work directly with the best manufacturers in order to consitently provide the best products at the lowest possible cost.

  3. Our process is simple and easy. We handle all permits, applications, and paperwork on behalf of our clients.

Approved EnergySage badge

Approved installers passed our rigorous screening criteria for experience, licensing, and positive reviews.

Services Offered

  • Installation
  • Financing
  • Roofing
  • Electrical Contracting
  • Solar Repair & Maintenance

Our team of dedicated consultants have over 20 years combined experience in solar sales and project management. We offer a friendly, educational approach to sales with a focus on empowering our clients to make the best decisions possible. SES has worked successfully with thousands of homeowners to help them achieve their renewable energy goals. We use the best technology available combined with our extensive experience in order to provide our clients with the easiest process at the highest value.

Workmanship Warranty

25 year comprehensive warranty on installation.


Virginia Master Electrician #2710057042
Virginia Master HVAC #2710057042
MHIC #126665
Maryland Master Electrician #12512
Rockville city ELL-0006778
Carroll County E2755M
Frederick County EM2716
Montgomery County ME203184 EB203185
Anne Arundel County B55622
Baltimore County MG12068
Howard County ES09928
Caroline County 1291
Frederick City 4164
Baltimore City M5464
Washington County EL-M-1502
EPA Universal License 0472672522600


Fully insured for up to $2,000,000.00 through State Farm


NABCEP Certified Solar PV Installer #032611-28
Maryland Master Electrician #12512
Virginia Master Electrician #2710057042
Virginia Master HVAC #2710057042
MHIC # 05-1255565

Industry Certifications

  • Better Business Bureau
  • Maryland DC Virginia Solar Energy Industries Association
  • Solar Energy Industries Association

Manufacturer Certifications

  • Certified Installer
  • Certified Solar Professional
  • Sungage Financial Certified Partner

What Customers Are Saying

46 reviews
Average Rating 46 review(s)
Leave a Review
Very happy with SES

I am very happy to chose SES. The price was great. I ran the materials they used by a few solar forums and all got thumbs up. Virginia and Loudoun County were a pain - like they don't much want solar (compared to where I used to live in DC where it was a breeze), but SES was great about navigating all the hurdles. Kenny in particular was responsive and nice. Aric doing the inspections was very skilled and personable.

Posted by aaronjohns on Apr 19, 2024
sustainable energy systems review

Sustainable proposed a string inverter solution. I've read multiple articles that micro inverters are a superior solution in terms of reliability and throughput. So, I rejected this vendor

Posted by frankhnewman on Apr 04, 2024
Responsive service and good followup

It took a few months to get my system installed, but once in place, it worked well and the company was responsive and followed up when needed.

Posted by skfh82 on Mar 19, 2024

Unethical and Extortionist practices - 14 months ago, my wife and I had solar panels installed on our home. The contract was brokered through a third-party (Zuna Solar - based in Texas). The installation went well, and everything is operating as it should. However, during August 2023, we experienced hail damage to our roof which has resulted in leaking that is slowly growing and causing damage to our living room ceiling. We had the roof inspected and confirmed the best way to deal with the leak is to have the roof replaced. We filed a claim with our homeowner's insurance and have had our claim approved and funded. With these funds, we contracted with a Northern Virginia roofing company to replace the roof. In order for this to occur, we need to have the solar panels dismounted, and then remounted after the roof replacement is completed. This is provided for in the contract on page 7, in the paragraph with the heading "Removal and Reinstall". Please note that the estimated cost on the contract is listed as "the greatest of $135 per panel or $2,700", although the contract also states this is subject to change. When we contacted Sustainable Energy Systems, they initially provided an estimate for the dismount/remount for a figure of $13,800 (drastically higher than "the greatest of $135 per panel or $2,700" figure provided in the installation contract), then went on to state that they would perform the work only if we canceled our contract with our current roofing company and paid SUSTAINABLE ENERGY SYSTEMS, LLC to perform both the roof replacement AND the solar panel dismount/remount. I refused to accept either the radically inflated cost for the dismount/remount work or to cancel my contract with our current roofer (we have already paid a 30% deposit), so we are no longer in discussions with Sustainable Energy Systems. I will never do business with them again due to these unethical and extortionist business practices.

Posted by gschierman on Feb 21, 2024
doesn't honor warranty, no service

I have tried dozens of times since June to get them to repair two (now 3) faulty panels that are not reporting data to the optimizer. Problem might be with the modules or the optimizer or the connector to the optimizer. The system is under warranty. I can NEVER reach the service department and messages are not returned. Sales has offered to have service return my calls, but service still does not return my calls. Basically, the service department is a scam, they do not have one and they will not provide any service. The install in 2015 was great and my roofer even complimented their work. But if anything fails later, you will get no help.

Posted by jascourt on Dec 12, 2023
Solar installed, saving money.

I joined a Solar United Neighbors Co-op. SES won the contract. We applied for the install. There were delays due the Co-op creating a lot of contracts including us. No complaints. They sent an expert out to review the design, and made a minor change to ensure maximum production (a chimney shadow and couple of bathroom vents were in play). The day of install the crew was professional, paid attention to detail and did not do the "up and over" install to connect panels across the front and back of my roof (meaning a no curb appealing conduit running over the roof). Instead they went into my attic and ran that conduit through the attic to outside the house and cleverly hid that conduit behind a gutter down spot to connect to the inverter. From the curb? A neatly installed array, and no unsightly conduits from the curb. They installed a new service panel and hit a space problem. Resolved at no additional cost. We went active January 13 and our monthly bill dropped to $8.71 (Pepco connect to the grid fee no getting out of that) by March and has held while we build credits for the Winter (BTW we paid for the panels as SES told me they don't want to do PPA or Lease). They are worth getting a quote from and if a SUN Co-op choice? No brainer.

Posted by malcolmjohns on Sep 19, 2023



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