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For the curious there is an ongoing construction of such pumped-storage in the canton of Valais in Switzerland. It is called Nant de Drance [1] and is located at the Emosson Dam, between the "Emosson Lake" and "Old Emosson Lake".

[1] https://en.wikipedia.org/wiki/Nant_de_Drance_Hydropower_Plan...

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Carter's dam in Georgia has been operational since 1977 doing pretty much the same thing. Pretty sure the idea has been around for ages but with solar and wind power needing storage it might see more use. The one consideration is that recent environment trends have been against dam building in some areas and even to the point of removing them.

https://en.wikipedia.org/wiki/Carters_Dam

On a side note, the imagery in the article is very good

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