[email protected] <[email protected]> wrote: An old submarine hull (ridged structure) would work nicely as a reservoir. >
That's an underwater reservoir: https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricity#Underwater_reservoirs That is MUCH too small. It has to have hundreds or even thousands of times more capacity than that to hold a significant amount of energy. The water pressure is low. The reservoir is not far below sea level. It is not like a dam with water falling hundreds of feet. Typical pumped storage lakes are 30 to 50 million cubic meters. - Jed
