I think pumped storage is 70 to 80 efficient. I think the Helms Pumped Storage Plant is about 120 million kwh storage(guess). https://en.wikipedia.org/wiki/He

I think pumped storage is 70 to 80 efficient. I think the Helms Pumped Storage Plant is about 120 million kwh storage(guess). https://en.wikipedia.org/wiki/Helms_Pumped_Storage_Plant https://en.wikipedia.org/wiki/Helms_Pumped_Storage_Plant