About Sage

In 2005, David Williard founded Sustainergy Systems in rural Marin county to help local ranches and businesses reduce energy costs and make the switch to renewables. In 2009, David was joined by his brother, Tom Williard, a software engineer and local school board member, and Brent Johnson, a civil engineer with a background in water and environmental engineering, to form Sage Renewable Energy Consulting.

By 2014, Sage had established itself as a leading project management and energy consulting firm for California businesses, public agencies and school districts. Our team has evaluated and managed more than 300 MW of renewable energy, including the largest contracted commitment to solar by a public school district in North America—Kern High School District’s 27-site solar project. Other professional services firms—financial advisors, architects, construction managers, and legal teams—also turn to Sage for auditing and due diligence of energy projects. 

Our projects have saved hundreds of millions in energy costs for our clients, providing enduring benefits for the environment, resources, and fiscal health of their communities. We've helped more than 100 public and private organizations become leaders in the transition to renewable energy. 

Brent Johnson, Tom Williard and David Williard at the construction of a wind turbine at McEvoy Ranch in 2009.

Brent Johnson, Tom Williard and David Williard at the construction of a wind turbine at McEvoy Ranch in 2009.

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Tom Williard

  • 16 Years Experience, Renewable Energy
  • 20 Years Electronics, Software & Hardware Engineering

Prior to founding Sage, Tom was a Principal at energy consulting firms Sustainergy Systems and System Design. In 2005, he co-founded Solmetric, Inc., where he was Director of Research and Development for the initial SunEye product. Tom has expertise in modeling tool development, renewable energy finance, engineering and business development and construction oversight. Previously, Tom spent twenty years in the electronics industry as a management consultant, senior technologist and senior hardware and software engineer for a number of imaging and communications companies, most recently Ascend Communications. Tom takes an active role in his community and has served on several boards and foundations in Marin County, CA.  




Brent Johnson, P.E., LEED AP

  • 15 Years Experience Civil-Environmental Engineer
  • 7 Years Renewable Energy Sector

During his time at Sage, Brent has developed custom financial and energy modeling tools and managed all aspects of renewable generation projects including feasibility studies, system design, project bids and construction, commissioning, and environmental credits management. Brent has worked on over 100MW of renewable projects encompassing technologies such as solar PV, storage, solar thermal, wind, and hydropower. His previous experience in the US and overseas has included design of large municipal facilities, construction management, operational support, and CEQA permitting. He has overseen all aspects of project development from concept to commissioned facilities, including serving as a construction manager on a complex, $170M multi-year linear project. Brent holds an M.S. in Civil-Environmental Engineering from UC Berkeley and currently serves as a director for his local water and fire district.




David Williard, LEED AP

  • 18 Years Experience, Environmental and Renewable Energy 

David's work has spanned environmental site assessment, commercial energy auditing, energy code compliance, greenhouse gas emissions inventory and reduction planning, and all aspects of renewable energy project evaluation, development and management. In early 2005, he founded Sustainergy Systems Consulting & Design and was soon joined by his brother, Tom, to provide energy consulting services to business and government. In 2009, they formed Sage Renewable Energy Consulting with his long-time friend, Brent Johnson. David has developed extensive experience coordinating complex projects with government agencies and other organizations, including managing the largest solar energy project implemented by a school district in North America, at 27 sites in Kern County, CA. David is an outdoorsman and active in his community, and is enjoying his new job as a father.


Our Team

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