Combined generation of electricity and heat, i.e. cogeneration, is a method of generating electrical energy in which the heat released during the electricity generation process is used in a useful way, thus achieving a very high efficiency of use of energy contained in the fuel. At the same time, this process minimizes the losses that occur in conventional electricity generation. Due to the efficient use of “waste heat”, the combined heat and electricity generation can save up to 70 % of the energy contained in the fuel compared to separate electricity and heat generation.