top of page



Established in 2012 to focus solely on solar and industrial power, Engineered Power Solutions (EPS) addresses future energy demands with creative solutions and innovative technologies.

Meet our Team

EPS_Matthew Gillis.png

Matthew Gilliss

Principal, P.E., LEED AP

Matt founded EPS in 2012 and has engineered and approved more than 1,000 projects totaling over 2 gigawatts. He is an associate member of the Structural Engineers Association of California (SEAOC) on the Solar Committee which provides design/code interpretations and recommendations for the solar design industry to the International Code Council (ICC). He graduated Cal Poly San Luis Obispo with a BS in Architectural Engineering.


During his time off, he enjoys wine tasting, camping and gardening with his wife and two daughters.

EPS_Jason Kelley.png

Jason Kelley

Principal, P.E.

After working with Matt for several years as a contractor, Jason joined the company full-time in 2018 and became partner. He brings over a decade of experience engineering and managing construction of large-scale infrastructure projects for major electric utilities. He graduated Cal Poly San Luis Obispo with a BS in Architectural Engineering.


Jason currently manages utility-scale ground-mount solar projects, including specifying racking and foundation design requirements based on product specific wind tunnel testing, geotechnical reports and corrosion evaluations.


Jason enjoys spending time with his wife and two children on outdoor adventures, and has a passion for water sports and DIY projects.

Jason Serda

Project Engineer

Jason joined EPS in 2015 with a BS in Architectural Engineering from Cal Poly San Luis Obispo. He brings a fresh perspective to EPS and provides our clients with efficient and practical designs.


During his time off, he runs a small fabrication and welding company, goes camping, takes road trips and spends time with his family.

EPS_Valerie Gillis.png

Valerie Gilliss

Office Manager

Rachel Keith

Project Engineer

Rachel joined EPS in 2020 and since graduated cum laude from Cal Poly San Luis Obispo in 2021 with a BS in Architectural Engineering and a minor in Construction Management.


She is a strong addition to the EPS team and is committed to helping build a sustainable future and benefiting the global environment.


In her free time, she is involved with the Cal Poly Alumni Band, enjoys relaxing on the Central Coast and traveling with her family.

EPS_Gary Phelps.png

Gary Phelps

Corporate Administrator

EPS_Jason Serda.png

Gary joined the EPS team in 2019 with four decades of managerial experience in the financial and banking industry. He manages our out-of-state corporate compliance.


In his free time he enjoys spending time with his wife of 40 years, gardening, spoiling his border collie and chasing his grandkids.

Valerie joined EPS in 2017 and is invaluable managing A/R and various other essential functions. She is passionate about seeking sustainability for our future, and is excited to be part of a company that is paving the way in solar innovation.


In her free time, Valerie volunteers with the Girl Scouts, her children's school and at church. She loves spending time outdoors with her family, whether it's working on their mini-farm, hiking, camping, or playing at the beach.

EPS_Rachel Keith.png
bottom of page