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31st European Photovoltaic Solar Energy Conference and Exhibition; 2784-2788, This paper analyzes the energy supply system of the municipality of Bressanone, province of Bolzano, studying renewable energy sources (RES) high penetration scenarios. Particularly, the benefits from the increase of photovoltaic installed power and high and low efficiency storage devices were evaluated. Firstly, the reference scenario was built using energyPLAN, system analysis tool based on energy consumption and production data for the year 2010. Three different scenarios were then produced and compared, with the reference system, on few parameters: renewable energy integration, carbon dioxide emissions and economic costs. The results show that an increase of photovoltaic capacity up to 20 MW (approximately 1 kW/person) produces an improvement of all the evaluating parameters: increases RES integration, reduces CO2 emissions and slightly decreases annual economic costs. The threshold of 50 MW of photovoltaic rooftop potential capacity in Bressanone – filtered for insolation level and historical city center - could be reached with an increase of annual economic costs. In order to further improve renewable energy integration and CO2 emissions, scenarios with different installed capacity of storage and different round-trip efficiency were thus investigated.