The combined generation of heat and power (cogeneration) is praised by many as a technique for reducing the emissions of O2 in industrial ized nations. This is generally true but not always. In this article we discuss the impact of some major variables on the CO2 emission reduction capacity of cogeneration. Two sets of variables are predominant: the characteristic of the CHP process and the composition of the electricity generation sector. We highlight the interaction between the two sets of variables with the help of diagrams. Keyword: Cogeneration; CO2 emissions; Energy technologeies Aviel Verbruggen, michael Wiggin, Nadine Dufait and Adwin Martens.
