About ECA Maui

Teri Mister, ECA Co-founder

Willy Bennett, ECA Co-founder


ECA was created to help businesses and homeowners save energy. We conduct energy surveys to find ways to improve energy efficiency. ECA uses energy monitoring, project management, and training to empower the customer to significantly reduce their energy usage.

Our mission is to design and improve energy efficiency, solar hot water and photovoltaic systems in Hawaii and similar climates, and to provide data and information to encourage the use of alternative energy.

Research shows that lowering your energy costs before you install solar-powered energy will save you a bundle!

Why wait? Call or click here to make an appointment for a consultation today.

Meet Lead Consultant, William S. Bennett

ECA Founder Willy BennettWilliam S. Bennett, co-founder of Energy Consulting Associates, LLC, has a BS in Electrical Engineering and is certified in Energy Management and EMF measurements. He worked as an aerospace engineer for twenty-five years where he served as a member of the Hubble space telescope design team. Willy first began working in the solar field on Maui in 1975, optimizing the designs. In the late 1990s, after a period on the mainland, he returned to Maui to manage the Maui division of a solar company where he continued researching and creating more efficient solar hot water systems. He worked with Maui Electric (MECO) as an Energy Management Consultant helping businesses save energy for seven years where he created the commercial solar water heating rebate program.

Willy is the founder of the Hawaii Energy Test Laboratory at UH Maui College, where research was performed to develop methods of optimizing Hawaiian solar water heating. He is a member of the American Solar Energy Society (ASES) and the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE).