EFS Energy
NABCEP-certified St. Louis solar installer since 2011, specializing in residential, commercial, and agricultural systems with over 2,000 installations
15+
Years in Business
2,000+
Projects Completed
60
Customer Reviews
99 mi
Service Area
11-50
Employees
SurgePV Score
About EFS Energy
EFS Energy is a St. Louis-based solar installation company founded in 2011 by Paul McKnight. The company specializes in residential, commercial, and agricultural solar projects across Missouri and Illinois, with over 2,000 systems installed to date. EFS Energy’s entire installation team holds NABCEP certifications, and the company is a member of the Missouri Solar Energy Industries Association, the U.S. Green Building Council, and the Illinois Solar Energy Association.
The company installs panels from Silfab Solar and works with inverters from Enphase and SMA, selecting equipment based on the specific needs of each project. Battery storage is available through the Enphase IQ platform. EFS Energy handles all aspects of the solar process in-house, from initial design and engineering through permitting, installation, and utility interconnection. The company is experienced with both rooftop and ground-mounted systems.
EFS Energy operates from its office at 3407 South Jefferson Avenue in St. Louis and serves customers throughout Missouri and into Southern Illinois. The company provides free solar assessments and works with various financing options to make solar accessible to a wide range of customers.
Service Area
EFS Energy serves the following areas within a 99-mile radius:
Contact Information
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Services Offered
Certifications & Accreditations
Partner Manufacturers
Panels
Inverters
Batteries
Warranty Coverage
25 years
25 years
10 years
What to Expect: Solar Installation Process
Initial Consultation
Free site survey and system design
Quote & Design
Detailed proposal with costs and savings
Installation
Panels, inverter, and wiring (1-3 days)
Inspection
City inspection and utility interconnection approval
Go Live
Utility grants PTO, system goes live
Customer Reviews
4.7
60 reviews
Scott M.
EFS Energy installed a 12 kW system on our farm building. The team was experienced and completed the work on schedule. Production has matched the estimate almost exactly. Great company for agricultural solar projects.
Amy G.
We chose EFS Energy for our residential installation after comparing several quotes. They offered competitive pricing with quality equipment. The Enphase monitoring system makes it easy to track our production daily.
Brian H.
Professional team with deep knowledge of the solar industry. Our commercial installation went smoothly, though the permitting process took a few extra weeks. The system is performing well and the ongoing support has been responsive.
Frequently Asked Questions About EFS Energy
What services does EFS Energy offer?
EFS Energy offers Solar Installation, Battery Storage, Solar Design, Energy Audit, Grid Connection, Maintenance.
Is EFS Energy NABCEP certified?
Yes, EFS Energy is NABCEP certified and also holds MOSEIA Member, USGBC Member, ISEA Member certifications. NABCEP certification is the gold standard for solar professionals in the United States.
What areas does EFS Energy serve?
EFS Energy serves St. Louis, Jefferson City, Cape Girardeau, Edwardsville, Belleville, Springfield. They are based in St. Louis with a service radius of 160 km.
What warranty does EFS Energy offer?
EFS Energy offers 25-year panel warranty, 25-year inverter warranty, and 10-year installation/workmanship warranty.
How are EFS Energy's customer reviews?
EFS Energy has a 4.7/5 rating based on 60 customer reviews. Customers consistently rate them highly.
How long has EFS Energy been in business?
EFS Energy was founded in 2011 and has been in business for 15 years. They are one of the more experienced solar installers in their area.
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