The development of urban and rural landscapes has entered a pioneering era with novel combinations of energy production and consumption and related changes in the urban and rural fabric including associated socioeconomic issues. Accompanying this change is a realization that newly developing energy initiatives are more viable for development and upscaling and are less vulnerable to failure and resistance from society if they are well integrated into their local and regional contexts. However, institutional questions remain regarding the required mechanisms and levels of integration, while simultaneously sustainable energy planning requires that the stakeholders with diverse and conflicting objectives come to some degree of consensus. Inspired by these findings, a methodological approach for holistic energy planning on a regional/local level was developed within the framework of the INTENSSS-PA project that is funded by HORIZON 2020. The approach provides a holistic energy plan, which goes beyond a blueprint for allocating renewable technologies and is based on the involvement of the wider community. Hence, this approach includes aspects such as the development of spatial concepts, new co-creating strategies, business cases, societal alliances and institutional changes and formats. To implement this approach, the Living Lab (LL) concept is applied. The case of Karditsa, in Greece, will be presented as evidence of the effectiveness of the proposed planning approach.