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I also wanted to make this note about the application matters. Lithium ion are great, especially for electronics and EVs. They are pretty good for grid scale,

I also wanted to make this note about the application matters. Lithium ion are great, especially for electronics and EVs. They are pretty good for grid scale, but we need other technologies there. Currently the largest source of storage on the grid is pumped hydro (about 95% of storage on the grid) and it will continue to be the largest source of storage for a long time.

usrusr 8y ago
Depending on what exactly you want to measure, the largest grid storage by far is the power-to-gas/gas cavern/gas power plant cycle. But of course only a miniscule fraction of the energy currently going through caverns and gas plants comes from power-to-gas, so it's not wrong to put pumped hydro ahead (possibly even battery installations, p2g is tiny)