The first use of pumped storage was in the 1890s in Italy and...

  1. .y.
    3,566 Posts.
    The first use of pumped storage was in the 1890s in Italy and Switzerland. In the 1930s reversible hydroelectric turbines became available. These turbines could operate as both turbine-generators and in reverse as electric motor driven pumps. The latest in large-scale engineering technology are variable speed machines for greater efficiency. These machines generate in synchronization with the network frequency, but operate asynchronously(independent of the network frequency) as motor-pumps.

    Didn't realise the idea was thought of long ago
    Thanks for the link.
 
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