Abstract
This chapter provides an overview of the current tendencies, potentials, and technologies to recover energy from water resources, which can be divided into two main fields: conventional hydropower and ocean energy. A strong focus is placed on “conventional hydropower” and especially on small hydropower (SHP), through the description of a case study dealing with a raw wastewater network. Indeed, marine energy is still in its development phase, even if tidal currents technology continues making great steps forward.
The chapter begins with the main equations for hydropower and ocean energy. Then, the historical evolution of water energy recovery is summarized, followed by worldwide potentials. Environmental issues, especially for SHP, are analyzed, before a discussion of the best available mature technologies. All the components of a SHP plant are presented.
With the case study, more details are given on how a SHP project can be led so as to optimally recover the water energy, even coming from wastewater.
The economic tendencies for SHP are given, based on a recent Swiss analysis of the market.
Finally, the greater objective of the chapter is to demonstrate the sustainability of water energy and its technologies.