” Cogeneration” is an efficient and environmentally friendly technology recommended by the EU. The paper presents, through examples from Romania, achievements regarding” high power cogeneration (HPCG)”
and” low and medium power (LMPCG)” installations, respectively. Some technical-economic and ecological performances are given for comparison. Under the conditions of decentralization and decarbonising of energy production LMPCG can become a unique solution, or complementary / alternative to HPCG. Having a long theoretical and practical activity in the field, the author argues that the decision to choose the optimal solution for heat supply of any type of consumer must be made based on a complex
technical-economic calculation to assess for each variant, including environmental aspects and the impacts (positive and negative), “internalized”
in the costs of heat production from those sources.