The necessity of developing the production of biogas and digestate at Ukrainian sugar factories focused on the further sale of biomethane in the energy market and for its own needs is substantiated, which will partially ensure the energy security of the state under martial law. The volumes of sugar beet cultivation are determined, and the potential volumes of biogas production from the waste of Ukrainian agro-industrial complexes are investigated. A model of the functioning of a production bioenergy cluster based on a sugar factory has been developed and proposed. As a result of the study, it was found that a tangible way to increase the level of energy autonomy of the processing industry of the agro-industrial complex of Ukraine is the production of biogas by anaerobic digestion and its subsequent purification to the state of biomethane. To produce this type of biofuel, the use by-products of agriculture, agro-industrial processing enterprises, and organic waste from territorial communities where sugar factories are located is advisable. At the same time, as the analysis of resource potential shows, modern methane generation technologies allow using a wide range of biomass as a raw material base, which can be obtained both from production activities (non-core (non-target) products) and from household waste in general, which is one of the methods of solving the problems of their utilization. It has been determined that the use of advanced technologies for the transportation of liquid digestate and its injection will reduce the cost of application, increase the absorption in the soil, and the use of biodiesel will reduce transportation costs.

The article examines the environmental performance of a diesel generator that runs on a biofuel mixture. Biofuels are considered to be more environmentally friendly than traditional petroleum products and have become popular alternatives in the field of electricity production. To reduce dependence on petroleum fuels and decrease harmful exhaust-gas emissions from diesel generators, it is suggested to use biodiesel fuel and its mixture with diesel fuel. Various environmental indicators were measured and analyzed in this study, including the emissions of harmful substances, carbon dioxide, nitrogen oxides and particulates. By using biofuels, pollutant emissions are expected to be reduced because biofuels are made from renewable sources such as vegetable oils or biomass. The results of the study show that the use of a biofuel mixture in a diesel generator leads to a significant reduction in the emission of harmful substances compared to the use of traditional petroleum products. A reduction in the emissions of carbon dioxide and nitrogen oxides was found, which contributes to a reduction of the impact on climate change and air pollution. In addition, a decrease in particle emissions was noted, which contributes to the improvement of air quality and people’s health. The goal was achieved by researching the impact of a mixture of diesel and biodiesel fuel on the technical, economic and environmental indicators of an autonomous diesel generator. The regulation of the composition of the fuel mixture ensured the preservation of the power of the generator in all its modes of operation, while reducing the cost of purchasing fuel by 10% and reducing the smokiness of exhaust gas by up to 57%, depending on the mode of operation of the diesel engine.