In Ljubljana, Slovenia, the public transport company LPP and the energy company Energetika Ljubljana have made a significant stride towards carbon neutrality with the introduction of the first city bus powered by 100% biomethane. This initiative is part of the Mission 100 Climate Neutral and Smart Cities by 2030, aiming to transform urban mobility. By utilizing biomethane, derived from renewable sources like biogas, the bus has become carbon neutral without the need for extensive infrastructure changes. The gradual transition of existing methane buses to biomethane will enhance the environmental friendliness of the fleet. Moreover, the collaboration between Energetika Ljubljana and LPP highlights a proactive approach to sustainable urban development. Plans are underway to introduce hydrogen buses and electric buses in the near future, further aligning with the city's goal of achieving carbon neutrality by 2030. This strategic partnership emphasizes the importance of public transportation in reducing the carbon footprint and promoting a cleaner environment in Ljubljana. Residents and visitors are encouraged to opt for public transport, recognizing its role in enhancing air quality and overall well-being in the city.