The city of Pozna and its residents access to an energy-efficient co-generational source of heat and hot water supply, having an additional positive influence on air quality in the city. The district heating system in Pozna has over 360,000 end users of heat, residents, public institutions, commerce, and industry. The program, implemented on the initiative of Dalkia, fits well the comprehensive program of economic and social regeneration of these districts, announced and implemented by the city authorities. For Dalkia, the program offers an opportunity to develop a network in a way that is independent of the new investments in the city, which was especially important in the last two years of crisis and halted construction projects. The city for its part will benefit from the program of constructing and developing the district heating system in historical residential districts, heated previously by individual heat sources, often operating on hard coal, by a significant and evident reduction of “low emission”, or air pollution from sources without monitoring devices cleaning exhausts.