- Airlift Technologies
 - Redlands - Manufacture of airlift water pumping windmills. - California Hydrogen Business Council
- Los Alamitos - Promotes the conduct and growth of hydrogen business by identifying opportunities, building partnerships, and providing educational programmes about technologies.
- Control Components, Inc. (CCI)
- Rancho Santa Margarita - Manufacturer of velocity control valves for severe service applications.
- Encapsulation Technologies
- Los Angeles - Uses a passive aerosol fogging technique to eliminate airborne radioactivity and fix contamination remotely.
- Globe Gas Corporation
- Long Beach - Propane installation and delivery services for Long Beach and the rest of Los Angeles, San Bernardino, and Orange Counties.
- GO Solar Company
- North Hollywood - Design, installation, and service of solar electrical and heating equipment.
- Hydraulic Rod Pumps
- Foothill Ranch - Oil & gas well long-stroke rod pumping units.
- Industrial Specialists, Inc.
- Anaheim - Design and installation of LPG storage and steam systems.
- International Energy Services Company (IESCO)
- San Pedro - Provides nondestructive examination and analysis services to the petroleum, petrochemical, and power industries.
- Powerzinc Electric, Inc.
- City of Industry - Develops zinc-air fuel cells for electric powered vehicles.
- Professional Solar Products
- Camarillo
- Royale Energy Inc@
- S. Bravo Systems, Inc.
- Buena Park - Offers petroleum maintenance products, including patented secondary containment/shutdown systems for gasoline dispensers.
- Solar-Tec Systems
- Dana Point - A solar energy contractor that designs, installs, and supplies solar electric (PV) power systems, solar pool heating systems, hot water, and home heating systems.
- Sun-Mate Corporation
- Canoga Park - Specialising in solar-powered consumer products such as radios, hats, and battery chargers, as well as solar panel, cells, and Bill Nye the Science Guy kits.
- Sunpower Systems
- Canoga Park - Manufactures and markets fully integrated solar charged cellular phone batteries.
- Utility Savings & Refund Services
- San Juan Capistrano - Energy service consulting firm.
- Vasco Solar Energy
- Costa Mesa - Specialising in the installation, design, repair, and sales of solar pool heating and hot water systems.
- Wintec Energy, Ltd
- Palm Springs - Providers of wind powered electricity.
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