"A topic of this work is connecting two areas - municipal waste and transport sector. From one side is the need for new energy resources in transport sector and from another - using waste as renewable source which is everywhere available although not desired and has to be solved anyhow. So, why not to consider more closely reuse of municipal waste in the form of energy needed for transport? The core thesis' question is how much biomethane can be produced from municipal waste in Croatia and being further used in transport sector or injected into the natural gas grid. To answer to this question, I used available data and estimation when needed. Additional issues under considerations were conditions for natural grid injection and usage by vehicles, as well as costs of biomethane production. At the end, as a conclusion, it has to be stated that any assessed potential would always stay only theoretical if there are no preconditions for its employment: awareness, the need for use, a proper development strategy and clear economic and social benefits."