Modern society has developed a growing dependence on electricity in order to carry out important societal functions. This implies the risk of cascading failures to society in the case of power shortage. The creation of a resilient and sustainable power energy system is therefore crucial. Equal crucial is the preparedness for the event of power shortage. As a part of the Swedish crisis management system, the Swedish Energy Agency (EM) has developed a planning system, STYREL, to identify social important objects in order to ensure important social functions in the case of power shortage. This article examines STYREL as a policy network and as a planning system to ensure a sustainable and resilient power supply. The study focus on the design of the system, the implementation of the system based on the results from the two rounds completed in 2010 and 2014. Using interviews with coordinators at the local and regional level in three counties and a survey including all 21 coordinators at the regional level, it indicates that the design of the planning system reviles opportunities for improvements of the planning system. The study also indicates that the coordinators at the local level lack trust in the planning system depending on both the lack of resource and the lack of feedback. This in turn indicates challenges for the system from a resilient and sustainability point of view.