- American Windmills
 - Placerville - Sells old fashioned water pumping windmills. - Battery MD
- Sacramento - Providing innovative R&D and service solutions to OEMs of electric, hybrid, and fuel cell vehicles.
- Cherrington Corporation
- Sacramento - Originators of horizontal directional drilling (HDD).
- Heschong Mahone Group
- Fair Oaks - Energy efficiency consultants for commercial buildings.
- JBS Energy, Inc.
- West Sacramento - Specialises in regulatory economics for energy consumers and producers.
- Northern Technology & Testing
- Sacramento - Indepedent laboratory serving the electrical power industry with dissolved gas analysis, PCB, and oil quality assessment testing.
- Petroleum and Refractory, Inc.
- Benicia - Provides hydrotesting, refractory inspection, tank inspection, and consulting services for the petro-chemical industry.
- Sierra Solar Systems
- Nevada City - Engineers solar electric and solar pumping systems worldwide.
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