Utilities want those power plants to store solar energy so it can be used to balance a power grid increasingly supplied by intermittent sources of electricity like wind farms.

FORBES: Secret Ingredient To Making Solar Energy Work: Salt

The energy concerns of the future have also been taken into account with grand schemes of super-fast charging batteries supplied ultimately by solar or wind power connected to the stacking stations that could even feed back into the energy grid of the city itself.

CNN: Reinventing the wheel