ABSTRACT Climate change poses severe challenges to human and environmental the environment around them. Therefore, it is necessary to act in the energy domain especially as a significant source for climate change is greenhouse gas emissions. Effective policy measures are imperative for addressing this critical issue. A key strategy is the transition from conventional fossil fuels to renewable energy sources. This strategy involves a fundamental shift from carbon-based electricity to a diversified energy portfolio predominantly constituted of renewables, complemented by a minor share of gas. The thesis at hand aims to conduct extensive energy system modelling for the island of Favignana over three different scenarios, identifying the most efficient clustering algorithm to reduce computational demands while maintaining precise outcomes.