- Berkeley Applied Science and Engineering, Inc.
 - San Francisco - Consulting/research and development firm offers energy and waste assessments, audits of manufacturing and commercial facilities, and develops energy efficiency software. - Bevilacqua-Knight, Inc
- Oakland - Providing analytical, planning, programme management and communications services to clients in the energy and transportation fields.
- Chevron Energy Solutions
- San Francisco - Offers a broad array of energy cost saving tools and strategies that are customised to individual businesses or institutions.
- Economic Sciences Corporation
- Berkeley - ESC offers anayltic consulting services and software for buyers, sellers, and investors in evolving electricity and gas markets.
- Exergetic Systems, Inc.
- San Rafael - Efficiency improvement of thermal systems for power plants through testing.
- Gabel Dodd/Energysoft
- Novato - Provides software and consulting services for residential and commercial building energy use analysis.
- Independent Power Associates
- South San Francisco - Providing engineering support, operations and maintenance, training and qualification, and project management to independent power plants and industrial facilities.
- KW Energy Engineering
- Oakland - Independent providers of energy engineering services specialising in commercial, institutional, and industrial mechanical systems.
- McPhail Fuel Company
- Petaluma - Propane delivery and service for home and industry. Serving the energy needs of Marin & Sonoma Counties since 1884.
- Nova Group, Inc.
- Napa - Specialising in general engineering contracts involving hydrant fueling systems and waterfront construction projects.
- Occidental Power
- San Francisco - Design, installation, sales, and service of solar thermal, photovoltaic, and cogeneration systems.
- Petroleum and Refractory, Inc.
- Benicia - Provides hydrotesting, refractory inspection, tank inspection, and consulting services for the petro-chemical industry.
- Praxis Engineers, Inc.
- Milpitas - Provides consulting and software development to the power production industry.
- Solarcraft Services, Inc.
- Novato - Installs and services solar energy equipment for residential and commercial use. Also maintains and repairs swimming pools.
- Solardepot.com
- San Rafael - Wholesale distributor of solectrogen solar electric generators and related solar thermal systems and products.
- Title 24 Online
- Fremont - Provides Title 24 energy calculations and services to homeowners, architects, contractors, and builders.
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