Chefs Catch@GettingCooked @Bunnyslope @Johncdvorak In Australia the grid is about 10GWH hours oversupplied. So using excess wind and solar, of which there is a LOT! to pump water up to elevations, then letting it gravity down pipes through a hydro turbine would be like making giant batteries. The engineering inefficiency of pumping up then running out is an argument, but the alternative is wind and solar being built, then not being used at all. Which is the current status quo.
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