The concepts of circular economy are changing the way energy is managed and resources are used by embracing efficiency, waste minimization, recycling, and sustainable manufacturing practices. Circular economy concepts help achieve environmental sustainability and resource security through extended lifecycle of energy systems and the reuse and recycling of valuable materials. We encourage submissions to the Journal of Energy Transition and Net-Zero Technologies in the areas of circular energy systems, resource recovery, waste-to-energy processes, life cycle assessment, and sustainable material management.