The last decade we are witnessing a new evolving era in the global energy environment as global measures towards the alleviation of climate change, agreements on carbon pricing and energy taxes, are terms that represent a significant part of the terminology in the energy sector. In this new era, renewables are an extremely attractive and desirable option for every energy mix, but their increasing share is decelerated mainly due to the old-fashioned electricity grids and the lack in decent energy storage options. On the other hand, the transition from the conventional linear to the new circular economy concept requires that energy resources are retained as available for use in the production cycle for as long as possible, by maximizing economic benefits and minimizing the environmental impacts. As the circular economy is related to sustainability, specific technologies and practices are necessary to engage the economic with the social and technical drivers of production in order to reconsider energy management for supporting circular principles. Current renewable energy systems need to be revisited from the micro to the macro level to improve efficiency and recovery by redesigning all stages of production, from resource harvesting, production, storage, disposal and end-of-life practices. The necessary blending and transformation of renewable technologies under the circular economy principles, will stimulate emerging challenges for renewables that should contain necessary technological innovations and revised incentive policies. This Special Issue will gather up-to-date findings from leading researchers in this field and will bring increased confidence and visibility to the abovementioned issues. This Special Issue will be of benefit for researchers and decision-makers worldwide and it will include analyses across the range of renewables, containing technological management based practices mainly focusing on various circular economy aspects.