The world needs to switch to renewable and distributed energy systems as soon as possible since climate change and energy security issues become increasingly urgent. Solar photovoltaic technology, especially rooftop PV systems, is vital for this energy shift. Because it is flexibility, low emission, and adaptability to urban environments. At the same time, renewable energy communities (RECs) serve as a decentralized way to regulate energy. They give people opportunities to work together to produce, exchange, and manage local renewable energy. This study focuses on the Liguria region of Italy, exploring how rooftop solar photovoltaic systems can be effectively integrated into Renewable Energy Communities to enhance energy autonomy, economic efficiency, and environmental sustainability.