In modern society, energy sustainability and fresh-water production are two of main challenges to be faced to ensure a good quality of life for the human species and to preserve planet Earth. The energy demand comes up against the problem of the scarcity of currently exploitable energy resources and the need to increasingly limit the consumption of fossil fuels to reduce polluting emissions into the atmosphere. A solution in this direction consists of increasing the exploitation of renewable energy sources. However, this is still hindered by several issues, such as the mismatch between energy supply and energy demand and the sub-optimal capacity to store energy from renewable sources.