Developing frameworks at the local community level is essential to utilizing renewable energy and achieving the goal of a decarbonized society. In order to utilize variable renewable energy (VRE), such as solar energy, an energy storage methodology is essential. Although electric batteries are highly effective for short-term charging and discharging, they are not suitable for storing energy among between seasons. This is due to the following three factors: (i) building energy loads fluctuate significantly according to local climatic characteristics, (ii) solar power generation also fluctuates significantly, and (iii) electric batteries lose stored electricity over long periods. Therefore, it would be feasible to use electric batteries for short-term energy storage and consumption while using hydrogen for storage and consumption among seasons. In this scenario, a methodology and devices are required to transport hydrogen from the production point to each load point within the community. Simulations were conducted based on the idea that, from the perspective of infrastructure scalability and flexibility, mobility may become an efficient means of transport, taking into account the expansion or contraction of the community. The simulation results indicate that although there is currently no cost advantage due to the expense of hydrogen production equipment, this method will be highly effective in the future. Based on these results, a small test bed has been developed at the Okinawa Institute of Science and Technology, a university located on an island in southern Japan, as part of a subsidiary program of the Cabinet Office. We are currently demonstrating the delivery of high-pressure hydrogen cartridges and planning a community-scale test bed to evaluate the stable operation as well as the life cycle cost and the whole life carbon of the community.