There are many ways to store energy. Molten salt has been used in Spain and Arizon USA, but not at huge scale. https://en.wikipedia.org/wiki/Thermal_energy_st

There are many ways to store energy. Molten salt has been used in Spain and Arizon USA, but not at huge scale. https://en.wikipedia.org/wiki/Thermal_energy_storage#Molten_salt_technology https://en.wikipedia.org/wiki/Thermal_energy_storage#Molten_...