One strategy to enhance environmentally friendly energy harvesting involves using biomass as the primary energy source for generating electricity and hydrogen (H2). Biomass conversion through gasification is a promising technology due to its fast reaction rate and high conversion efficiency. Additionally, high energy efficiency can be achieved by minimizing exergy loss through process integration and exergy recovery. This chapter discusses the potential for power and hydrogen generation from biomass involving gasification and chemical looping technology. It includes the development and proposal of an integrated power/hydrogen generation system, with a focus on clarifying key operating parameters to enhance energy efficiency. With efficient management, hydrogen has the potential to replace conventional carbon-based fuels. Finally, as potential future secondary energy sources, electricity and hydrogen should be mutually convertible.