Our Heritage

Since 1996 we have been helping our customers grow their businesses and protect the value of their properties across the Northeastern United States. With deep roots in site development, turnkey construction, landscape and facilities maintenance and property management, today we bring all our expertise to the solar energy industry.



Our Mission

We build and maintain utility-scale solar facilities to the highest standard throughout the Northeast. We help developers and owners achieve long-term success by providing them with quality constructed and maintained facilities. We believe in providing turnkey solutions or specific services—based entirely on each client’s business model and need. 



Our Team


B. Scott Gillespie


With more than 30 years of business ownership and management experience, 20 years as owner of OnSite Companies, Scott has overseen the construction of hundreds of millions of dollars’ worth property over his career. He still serves the first OnSite customer and leads more than 60 employees. Scott graduated from Ithaca College in 1989 with a Bachelor of Science degree in Business Management. Today he is responsible for all financial decisions, business direction planning and execution of OnSite Companies and OnSite Solar.


Brian J. Walters

Senior Vice President, Sales and Marketing.

With strengths in both sales and construction, Brian was instrumental in the early growth and development of the Construction Division of OnSite Companies. Brian sold and managed several million dollars of commercial construction and developed an asphalt management program to help private institutions maintain and improve asphalt infrastructure with a controlled programmatic approach.  Prior to joining OnSite, Brian was the Director of Business Development for Camp Dresser and McKee. Brian received a Bachelor of Science degree in Construction Management from Utica College of Syracuse University in 1997.


David Carroll

Business Manager

With a decade of experience in the renewable energy field as a project manager, business leader, project developer and field technician, David brings to OnSite Solar proven expertise in leading innovation within the solar energy sector.  His operations and maintenance background provide a broad perspective for each project OnSite Solar manages.   Our clients count on him to manage budgets while streamlining logistics on their projects, and providing the highest quality results. David graduated from SUNY Stony Brook University in 2007 with Bachelor of Science degree in Environmental Science.


Bill Coon

Project Manager 

With more than 25 years’ experience in construction, engineering, project management and quality assurance, today Bill is the lead project manager and estimator at OnSite Solar. He is a NABCEP Certified PV Installation Professional who manages our production crews, schedules all work, coordinates and orders all materials, oversees safety and coordinated subcontractors as needed. Bill graduated from Syracuse University in 1997 with a Bachelor of Science degree in Mechanical Engineering. 



We can oversee all aspects of your energy project or provide any mix of needed services to your team. Contact us to learn more.