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 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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