At the moment levelised cost of storing a kWh in a gravity battery costs roughly the same as producing it does (highly dependent on country).
That depends a lot on how long you store the energy. As far as I understand most of the projects expect to use the energy within less than 24 hours to reach the cost efficiency you are talking about. Storing energy from summer to use in winter is two orders of magnitude more costly with gravity batteries.
That depends a lot on how long you store the energy. As far as I understand most of the projects expect to use the energy within less than 24 hours to reach the cost efficiency you are talking about. Storing energy from summer to use in winter is two orders of magnitude more costly with gravity batteries.