This chapter examines the integration of decentralized blockchain-based systems to automate financial settlements in local electricity markets, aligning with sustainable energy goals. By leveraging blockchain technology, the proposed system ensures transparency in transactions, secure data storage, and rapid data processing. These features enhance resilience against cyber threats, corruption, and fraud while supporting energy efficiency and cost reduction. The decentralized approach fosters sustainable energy distribution by simplifying system access and promoting balanced electricity allocation between suppliers and consumers, contributing to the advancement of smart grids and sustainable infrastructure.