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Renewables surprisingly "on track" to meet net zero by 2050
(newatlas.com)
This is a most excellent place for technology news and articles.
The US (which is where I assume you are), has the second largest one in the world in current operation:
https://en.wikipedia.org/wiki/Bath_County_Pumped_Storage_Station
Short answer, it scales fine.
Now you need to find someone to pay for it.
The gas industry doesn't likes this