- Alternative Fuel Systems Inc. (AFS)
 - Emission reduction technologies including natural gas and natural gas/diesel systems and components plus catalytic converter technologies.  Eneco
- Design, development, and manufacturing company offering innovative solutions for zero and low carbon emission systems.- Green Car Group
- Offers marketing and communications services and independent research through its nonprofit institute.
- Green Star Products
- A holding company with various equity positions in energy and transportation technology companies.
- Natural Gas Vehicle Institute.
- Provides natural gas vehicle education, training, consulting, and technical assistance to vehicle manufacturers, fuel retailers, utilities, NGV users, consultants, and others.
- UQM Technologies
- Design and development of electric and hybrid-electric vehicle propulsion systems and electrical components.
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