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This article discusses the integration of renewable energy sources in islanded energy systems, focusing on electrification of the transport sector and highlighting the challenges that are faced. The proposed method comprises different steps. First, the energy system is analyzed using the Smart Energy Systems concept to identify high renewable energy scenarios. Then, the power system is evaluated to ensure compliance with security and stability requirements. The method innovatively combines an overall energy system analysis, from an energy planning perspective, with more detailed power system analyses, where the power balance at each instant is the main item of interest rather than the energy balance. The study, applied to Gran Canaria (Canary Islands, Spain), demonstrates that 100% electrification of passenger cars with renewable energy sources is the optimal scenario, resulting in reductions of 45.86 …