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CHP - Capturing Wasted Energy Good basic overview of CHP and statistics. This is a brief of the full paper, but some good basic information on congeneration with diagrams and charts. http://www.aceee.org/pubs/ie983.htm
Cogeneration Technologies The company provides cogeneration development including engineering, design, feasibility studies, financing and investment capital. http://www.cogeneration.net
Microgy Anaerobic digester technology that produces "green" energy by burning biogas derived from animal wastes. http://www.microgy.com/
Nils Tellier Consulting International NTCI Inc provides engineering services for air separation plants, gas processes and small distributed power generation plants. Worldwide. http://www.ntciinc.com
Transparent Energy Systems Private Limited Steam Engine Driven Continuous Duty Power Generating Sets for Captive Power Generation. Free Refrigeration Effect, Energy saving, Efficiency Upgradation http://www.tesplcogen.com/
Vital Energi Ltd UK company for combined heat and power (CHP) and district energy. http://www.vitalenergi.co.uk
Website for Aircogen Ltd Aircogen Ltd design, manufacture, install and commission quality, custom built CHP solutions. http://www.aircogen.co.uk
Wikipedia: Cogeneration Free encyclopedia article describing the concept of cogeneration. http://en.wikipedia.org/wiki/Cogeneration