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The growing concerns about climate change and security of supply opened way to a significant investment in the exploitation of RES (renewable energy sources) for electricity generation. The possibility of achieving 100% RES systems is being debated but concerns about costs, storage and backup capacity still prevail. This paper addresses the topic of renewable energy scenarios for the electricity sector, analyzing different possible future strategies for the Portuguese system. Each one of these strategies is characterized according to the expected electricity consumption and renewable share, with the final aim of analyzing a possible 100% RES scenario. The energy system analysis tool EnergyPLAN was used for simulating each scenario for a one year period. The 100% RES scenario is found to be theoretically possible but a significant increase on the total capacity of the system would be necessary to ensure no …