The submitted dissertation thesis involves research of various gaseous fuels and the utilization of each in progressive energy technologies. In the first part – the theoretical chapters – the literature review and existing knowledge are presented with key information about the role of hydrogen in the whole range of processes of creation and energy utilization related to various gaseous fuels. The main result from the work of previous researchers in this field is that hydrogen, with its unique combustion properties, seems to be the most promising additive which can significantly increase efficiency and reduce fuel consumption and associated harmful emissions in conventional diesel engines. Compared to conventional hydrocarbon-based fuels, hydrogen has better flammability, higher flame speed, and faster burn velocity. Unlike other additives, hydrogen is a renewable (depending on its production process) and clean fuel. Based on the information obtained from the theoretical part of research a completely original solution for efficiency increase has been created for the energy utilization of alternative gaseous fuels in cogeneration combustion engine units through the injection of hydrogen into the intake air flow. This hydrogen is used as an additive for enhancing the combustion process - not as an additional fuel. The main result of the research carried out is the establishment of a technical solution of the integration of a hydrogen producing unit into a CHP device with a produced H2/O2 mixture injection into the intake air flow of the engine. The result of the research in the framework of this dissertation is patented as Utility Model No. 7596 under the title: “Method of utilization of a device for the combustion of alternative gaseous fuels with a hydrogen generator”.