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Sustainable Energy Systems LLC - Profile & Reviews

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.

19 reviews

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  • "Perfect Experience"

    Reviewed Mar 08, 2021

    From start to finish this company was professional, attentive and courteous. They had well laid out plans and everything was explained in detail. It was obvious they have been doing this for a long time. No pressure sales tactics or up sales. Just an honest company that prides itself in job well done.

    I actually contacted several other companies and decided SES was the best among the lot and I was not disappointed. Every employee was professional and took pride in their job. I usually would point out something that went wrong or could have been done better but I literally can't think of one thing to complain about which is rare.

    If you in the market strongly suggest you speak with SES before making any final decisions. They will answer all questions and will wait patiently for you to call them back which is exactly what I did.

  • "Residential Solar/Battery Install by SES - A Perfect Job!!"

    "Residential Solar/Battery Install by SES - A Perfect Job!!"

    Reviewed Jan 29, 2021

    We had long wanted to install solar and checked out a number of installers in the Northern VA area. We narrowed it down to 3 and began reference checks and requested proposals. Sustainable Energy Systems had the highest reviews from those who had used them and the best price. All of the employees we dealt with were completely transparent, extremely knowledgeable, and very willing to answer the many question we had. Our sales representative, Kenny, was very low key which was in contrast with other companies who wanted to rush us to sign a contract. We have been installed with 30 REC panels and 2 Tesla Powwerwalls for going on a year and the system has performed with high marks: generating energy at the levels predicted and operating seamlessly with the Tesla powerwalls when the power grid fails from time to time. I would highly recommend SES and actually we are thinking about expanding our system to accommodate a future EV.

  • "New residential installation"

    Reviewed Oct 22, 2020

    After quite a bit of research on material, service, and of course price, I hired Sustainable Energy Systems to install a large 18kW residential on-Grid roof system. They encountered some obstacles with county permit issues but persevered well through them. The installation was met with some unexpected work errors but I'm sure nothing ever goes perfect. They resolved/overcame the issues very well with a focus on making me, the customer, happy. I highly recommend Sustainable to anyone out there looking to invest in moving towards residential energy independence! A small ding on Responsiveness as I felt they could have communicated better.

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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 top 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!

Our company motto is “Stick it Where the Sun DOES Shine!” Though it is intended to make people laugh, we take that motto seriously. Whether it is on your roof, in your yard, or on your business - Sustainable Energy Systems offers a reliable and quality solar installation that is sure to get you powered by the sun in no time!

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

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Sustainable Energy Systems LLC Headquarters

4509 Metropolitan Court Unit H
Frederick, MD
21704 US

Local Offices (1)

  • 4509 Metropolitan Court Unit H
    Frederick, MD 21704

Workmanship Warranty

25 year comprehensive warranty on installation.



NABCEP Certified Solar PV Installer #032611-28
NABCEP Certified Solar Thermal Installer #RO-3204-2
Maryland Master Electrician #12512
Virginia Master Electrician #2710057042
Virginia Master HVAC #2710057042
MHIC # 05-1255565


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

States served by Sustainable Energy Systems LLC

  • District of Columbia DC ,
  • Maryland MD ,
  • Pennsylvania PA ,
  • Virginia VA