Roles of local and national energy systems in the integration of renewable energy

In the transition to renewable energy systems, national plans are being created for several countries around the world. Concurrently, regions, municipalities and cities are planning for CO₂ neutral and renewable energy systems. Both developments are necessary, which raises the question whether these two types of energy planning are coordinated. How should national plans specify local actions, and how should local plans take into account the surrounding development of the energy system? Most local plans rely on the surrounding energy systems as they need to integrate with the energy system to export excess production or import during demands with insufficient capacity. This paper suggests a methodology to analyse how well these local plans integrate with the surrounding national energy system. The methodology is applied to the two Danish examples of Copenhagen and Sønderborg. Both examples connect to the Danish 2030 scenario defined in the Coherent Energy and Environmental System Analysis study. Based on the results the study concludes that the suggested methodology is applicable for evaluating how well local and national energy systems integrate, and can potentially be used in bettering energy planning to include the benefits of local action and national coordination.