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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
Phone Number
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.

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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
  • SunPower Authorized Dealer
  • Tesla Powerwall Certified

Manufacturer Certifications

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

What Customers Are Saying

32 reviews
Average Rating 32 review(s)
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Great Installation ... TERRIBLE post install Service

The installation and operation of my residential unit went great. The unit has been operating for about 4 years now and generating estimated KWH. However, when ever I've reached out to Sustainable energy for follow-up service, I need to installed 'cirtter gaurds' to prevent squirrels from nesting under the panels, they have been IMPOSSIBLE to get a hold of. I recevied an estimate fo rthe work in Decemver of 2022, it is now May of 2023 and they have not returned any phone calls (voice mails) , emails, or submissions via their website.

Posted by Sander.Zaben on May 09, 2023
Easy to work with!

We were very happy with our solar installation. We did not choose Sustainable Energy Systems, they were selected by the co-op we were working with, but everything went very smoothly. They were proactive and communicative about the entire process from proposal through inspection. I would recommend them to others.

Posted by laurencbopp on Apr 16, 2023
Communication module needs upgrade the 3G is no longer supported

Trying to communicate with the service department about ordering a part that the technician on site on Dec 16 , 2022 recommends has been horrible. Leave messages and emails no response. just bad customer service. Almost 2 months and zero communication. The on site technicians have been good but customer support has been bad. Any communication would be good.

Posted by shipeweld on Mar 03, 2023
Everything Excellent (Except Field Team)

Now that the work is complete, I am happy with the end product. I received four pricing quotes when using energysage to choose my solar provider. I decided on Sustainable Energy Systems, because they had great reviews, optional in-home battery, local family-owned and were very helpful answering questions. They were the second highest price out of the four, but within a competitive range. Pros: Tara (they should clone her, she is extremely responsive and helpful) she was my main POC throughout. I was happy with the schedule which was complete within 7 months (Contract to Final Inspection). They have also helped with shade studies on adjacent pop-up projects in the neighborhood. With any/all problems I had with field installation (below), I always could count on Tara to have things corrected and scheduled quickly. Cons: They seem to have too many Projects, and are growing so quickly, that their field teams are cutting corners. The general rudeness and disrespect the crew showed at all stages of installation was shocking, field supervisor lied to me, missing electrical material and leaving without an update, destroying flower gardens and splitting a young maple tree (plenty of access on concrete carport and front walk), not installing the conduit correctly on the front side of my row home (corrected by a different team). I also lost over a month on solar production because of a communication problem with an inverter, and they were ‘backed up in the service department’. To be fair, I am sure any solar company would have had things to overcome throughout the process/install, and I did trust Tara and their office team to help and make things right. Which they always did!

Posted by steele.sarahe on Feb 06, 2023
Good price; willing to install on synthetic shake roof

Jan 2022 update: The team came out and installed the correct hardware for monitoring. We now have full monitoring. We have been pleased with the solar production, and the price was very competitive. The team was also the only one willing to install on our roofing material — synthetic shakes. [Prior review; issues have been addressed] The team failed to install the hardware needed for accurate monitoring of our energy consumption, so we have no visibility into the balance of our production and consumption. All we need is one more part, which our rep Kenny said is on back order. That's fine, but it's been over a year since our system was installed -- I struggle to believe no equipment has been shipped for a year. Be careful about working with this company if you want quality customer service after you've paid your last invoice.

Posted by mdowney9 on Oct 21, 2022
Road bumps every step of the way

We went with Sustainable Energy Systems for solar because they had the second best price we were able to find (out of 5 or 6), and they also had relatively good reviews and gave us some confidence and trust in their work from their quote. Unfortunately for us, there were road bumps every step of the way. Their initial plan was not approved for a permit because they didn't follow certain building codes for Baltimore City. The project lead for installation seemed frazzled and left in a hurry with our attic open and insulation everywhere. They had to come back 4 times to finish the electrical work for installation and then fix various other issues that caused the system to fail to turn on. When it finally was functional, one of their techs remotely turned the system off by accident - I had to contact Enphase to have it turned back on. They repeatedly said we were on track for their 120 day goal set in their contract, but it ended being 268 days in total. They also requested to be paid before the inspection was complete. Their customer support phone line and email is never answered (however they do seem to respond to texts). Our system is up and running fine now, but I do worry that if anything were to go wrong, we would have a tough time getting issues resolved. Overall, I can't say I would recommend them, unfortunately.

Posted by nolan.odowd on Jan 09, 2023



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