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We can't pump the water higher than 83 m, because the glaciers in the ice age didn't bring higher heaps of sand than that. A cooperation of southern Germany and Switzerland doesn't make much sense either, because all these pipes would be ugly, and a reservoir on each summit would be taking things a bit too far, I guess. No matter where you try, you will always have only very limited opportunities to build pumped hydro. We will need many more methods to store energy, combined with methods to steer demand.
A system that delivers energy (turbine), stores excess energy for late use (a gravity battery), filters groundwater (wetlands at every reservoir) and creates ponds and small lakes as a habitat for various wildlife to use, all while putting former strip mine workers to work could be a good way to address multiple problems with one solution.
What do y'all think?
If you can use the towers of a wind farm as water towers, that could be a good thing. I suppose there are some unintended consequences that will come out over time...
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