The biogas sector represents a perfectly integrated reality in Europe, particularly in Germany, Italy and France. Biogas allows the valorisation of waste products or by-products by transforming them into a versatile gas with high energy density, easily used in internal combustion engines to produce electricity and heat or transformable into biomethane suitable for injection into the national gas network. The numerous agricultural plants present in the Italian territory can play a fundamental role in the energy transition being a programmable renewable source able to follow the user demand. This document begins with an overview of Italy’s biogas sector, detailing current incentive systems, plant structure and components, types of biomasses used and the biogas upgrading processes.