Re: I've been pointing this out for years.
"Pumped storage is...erm...storage. Although that does raise an interesting point. Pumped storage is viable because they buy leccy at cheap "dead of night" rates and sell it back it peak demand rates. I wonder how long that will be viable if everyone is charging at "dead of night" rates/times?"
Pumped storage also absorbs over capacity when there is too much wind if possible. Otherwise they have to feather the turbines and "turn them down".