It is for example (after purification of water) possible to make WWTPs from wastewater. A study of the very serious EPFL has calculated that there is a potential of 35GW, the equivalent of 35 nuclear power plants (for a very small country like Switzerland).
Among the eligible sites there would be 106 including 19 "profitable" (but of course we should not fancy a lot of profitability as long as the cost of raw materials is skewed, but still reason with the feet on the ground, if not we will still blame him ...)
Pragmatically, we could be assured of having a PROFITABLE deposit of more than> 6,5GW here and without major development since it is on the basis of already existing pumping or retaining basins.
And this is where the conclusion of EPFL can interest any country, especially France, which has a lot of mountainous areas:
EPFL wrote:Finally, future technological developments are to be monitored: new small-capacity hydraulic turbines could make hitherto unpublished sites profitable, and make the recovery of wastewater hydraulic energy more common. In the context of the energy transition, the production of hydroelectricity on the basis of wastewater thus offers an interesting potential, not only economic, but also in terms of communication with the population by setting up a local production, practically without impact on the environment
Source: Federal Polytechnic School of Lausanne >>>
But let's go back to the profitable profitable sites, since that is what makes it possible to invalidate the relatively dishonest forecasts of Jancovici
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Sleep peacefully (well not too much anyway, we still have to kick the train of the "indécrottables" and there it is a big job)