Redesigning water supply systems from the perspective of energy recovery: A comprehensive proposal for the island of Naxos

This thesis focuses on the study and energy upgrade of a water supply project in Naxos. Although water supply systems are common across the Greek islands, none has been converted into a small hydropower plant to fully utilize the potential of the network. Hydropower projects are considered a form of Renewable Energy Source (RES), as they harness the kinetic energy of flowing water and the elevation difference of the terrain to generate electricity. Their development and operation are governed by the general legal framework applicable to RES, with specific provisions regarding site selection, licensing procedures, and key design principles. Within the scope of this study, a techno-economic analysis is conducted on the existing water supply system located in the municipal community of Apeiranthos, with a proposal to convert it into a Small Hydroelectric Power Plant (SHP), aiming to take advantage of the significant elevation differences in the project area. Subsequently, various aspects of the project’s implementation are examined in order to determine the most cost-effective and profitable approach. Finally, an assessment was carried out regarding the initial investment cost, operation and maintenance expenses, as well as the gross and net revenues expected from the sale of the generated electricity. The relevant calculations were based on correlations and data derived from the existing literature. Based on the outcomes, useful conclusions were drawn concerning the viability of the project and the environmental benefits associated with its implementation.