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The thesis "Upgrading to biomethane and power production in SOFC-based cogeneration system: An exergo-economic comparison of biogas conversion alternatives" by Massimo Moschini, supervised by Prof. Massimo Santarelli, Dr. Marta Gandiglio, and Ing. Guido Lorenzi, presents an exergo-economic analysis of biogas conversion alternatives, focusing on upgrading to biomethane and power production in a Solid Oxide Fuel Cell (SOFC)-based cogeneration system. The study compares different biogas conversion methods, evaluating their energy and exergy efficiency, as well as their economic viability. The research aims to identify the most efficient and cost-effective biogas conversion alternative, considering factors such as energy losses, exergy costs, and investment costs. The thesis is divided into 11 chapters, covering topics such as introduction, case study, methodology, energy and exergy analysis, exergo-economic analysis, and economic results, concluding with a discussion and sensitivity analysis.