There are may different energy storage systems. https://en.wikipedia.org/wiki/Energy_storage https://en.wikipedia.org/wiki/Energy_storage There have wildly di

There are may different energy storage systems. https://en.wikipedia.org/wiki/Energy_storage https://en.wikipedia.org/wiki/Energy_storage There have wildly different prices for unit of stored energy and wildly different storage times. https://css.umich.edu/publications/factsheets/energy/us-grid-energy-storage-factsheet https://css.umich.edu/publications/factsheets/energy/us-grid... It's not cost effective run aluminum smelting only during peak electricity production.