- PetroChem Inspection Services
 - Haddonfield - Offers nationwide inspection services in the refining and petrochemical industries. Also supplies outsourced inspection and NDE services. - Princeton Partners, Inc.
- Princeton - Full-service advertising agency working with a range of industries.
- Trigen - Philadelphia Energy Corporation
- Philadelphia - Provider of thermal energy for heating and cooling.
- Deiter Bros.
- Bethlehem - Offering fuel oil, heating, cooling, air conditioning, and security systems to Lehigh Valley for over 70 years.
- Princeton Energy Programme
- Princeton - Providing a modern, evolving learning structure for members of the oil, gas and electricity industries.
- Levr/Air, Inc.
- Doylestown - Offers a retrofit with McCabe Windmill Blades. Patented aerodynamics designed to improve output at lower airspeeds.
- Advanced Energy Solutions, Inc.
- Downingtown - Specialising in preparing clients for retail power purchasing, offering aggregation services, educational information, and more.
- Koch, James - Power Plant Performance Specialist
- Lansdowne - Provides performance testing and analysis for fossil steam, gas turbine, combined cycle units, heat balance studies, and more.
- S.J. Fuel Co.
- Woodbury - Providing NJ, PA, DE, and NY with commercial fuels and energy solutions including gasoline, kerosene, fuel oil, diesel, and residual grade oils.
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