About Us
// The Experts
Who We Are
The GreyEdge Group possesses unparalleled experience in leveraging the “heat beneath our feet,” with members who have spent over the last 50 years actively building the geothermal industry. As a premier team of Professional Engineers, Energy Modelers, Hydrogeologists, and Academic Researchers, we have pioneered the standards and practices that define the field today.
Industry Standards & Education:
Contributed to every major geothermal standard and authored the training programs for key industry certifications. We continue to teach the courses for Certified Geo Designer (CGD), Certified Geo Inspector (CGI), and Accredited Installer (AI).
Technical Innovation:
Our team has helped define the modern practice of geothermal and ambient loop design. Garen Ewbank developed industry-standard methods for characterizing ground conductivity and diffusivity, later patenting advanced methodologies to improve these processes.
Cary Smith, Mark Smith, and Bill O’Donnell helped bring the ambient, one-pipe temperature loop concept into the modern era through their pioneering work at Colorado Mesa University.
Global Project Experience:
Our team members have spent decades successfully installing and managing complex geothermal projects worldwide, spanning from Saudi Arabia to South Korea, and Canada to Mexico.
// The Foundation
Shaping The Future
2023
- 2016
The GreyEdge Group Founded
The GreyEdge Group was originally founded as something intentionally different: a collective of the Thermal Energy Networks (TEN) industry’s most accomplished individual practitioners, brought together around a shared conviction that TENs represented the future of district-scale decarbonization. Our founding members include the engineer who pioneered in-situ thermal conductivity testing in 1994, the hydronics specialist who brought the one
pipe ATL into the modern era, and a team that has contributed significantly to every major geothermal standard and created the industry’s certification curricula. Over the past decade, what began as a network of collaborating specialists has been forged into a focused, aligned team, one whose collective experience designing, building, and operating real ATL systems is unmatched anywhere in North America.
The result is a firm whose principals have managed more than 1,000 geothermal projects, have overseen the installation of over 80,000 tons of installed heat pump capacity, and maintained operating relationships with flagship systems that have been running continuously for 15 to 18 years. When we say we have real-world experience, we mean the kind that comes from watching systems perform, and underperform,
across every climate, building type, and institutional context over decades. We paid our dues years ago to learn the lessons that many of our competitors are just now getting to. All of our projects will benefit from that hard earned wisdom.
// The Solutions
What We're All About
The GreyEdge Group specializes in engineering and design of complex Thermal Energy Systems using the Ambient Temperature Loop. Our systems are operating successfully around the world delivering clean and comfortable heating and cooling on projects ranging from single-family homes to 123-story skyscrapers and large district geothermal systems.
Combined 300+ years of industry experience, our purpose as an organization is to deliver cost-effective, sustainable thermal and electrical systems and our vision is one where geothermal systems transform the energy delivery ecosystem and lead towards a sustainable, low-carbon future.
// The Mission
Why Choose Us?
Clients choose The GreyEdge Group because we understand that successful thermal infrastructure requires more than good engineering, it requires practical solutions that balance performance, constructability, cost, and long-term operational success.
By using a deep understanding of heat pump optimization, we seamlessly blend geothermal with a diverse array of unique, localized energy sources including solar thermal, wastewater, industrial waste heat, thermal storage, and mine water.
By connecting these multi-source thermal districts across massive geographic areas, we deliver predictable system performance at a much higher efficiency, with lower project capital and reduced operating costs than legacy systems.
We bring the full picture
Technical depth, creative problem-solving, and real-world experience.
Industry Pioneers
Proven Results
Client-Focused Approach
