3 ms·

this source claims that it would not be feasible to rely only on pumped hydro, due to the scale. [1] 1. http://physics.ucsd.edu/do-the-math/2011/11/pump-up-the

• Gibbon1 10y ago
  That source does thing like assume >I argued that we need 7 days of storage for it to be invisible to the end-user That said even with more reasonable numbers pumped hydro storage isn't going to work because the energy density is too low. I think roughly to store 1kwh your need to raise ~3.66 t water to 100m. Not very energy dense. However 1.8 kg of stone at 1000 degC will store about 1kwh of energy. That's a lot better. What's curious is Tom Murphy studiously ignores thermal storage.