During a Zero Emission Bus Conference in Center City Philadelphia, SEPTA showcased its new hydrogen fuel cell buses as part of a pilot program aimed at achieving a zero-emission fleet by 2040. The buses are set to operate along various routes in Philadelphia and the suburbs to evaluate their performance under different conditions. The project manager highlighted the importance of testing the buses in real-world scenarios to assess their viability. The article discusses the production of hydrogen using different energy sources and its implications for climate change, emphasizing the potential of 'green hydrogen' from renewable energy sources. SEPTA plans to transition to a mixed fleet of battery electric and hydrogen fuel cell buses, with ongoing pilot projects to determine the ideal combination. Challenges with battery electric buses led SEPTA to explore alternative options, with hydrogen fuel cell buses appearing more suitable for suburban routes. The article also contrasts the efficiency of battery electric buses with hydrogen fuel cell buses in utilizing renewable energy, pointing towards the advantages and considerations of each technology.