i dont see lithium-ion batteries be economical for grid level storage, since grid level storage is very different from a car, which require portability and the

i dont see lithium-ion batteries be economical for grid level storage, since grid level storage is very different from a car, which require portability and the car buyer pays a premium for portability. The biggest criteria for grid level storage is price to energy ratio. Cheap cost beats all, since size is not really a problem. So i want to see molten sodium, or heat based storage, which uses cheap materials. Or have cheap electricity produce green fuels for storage and use long term (e.g., synthetic "natural gas" from CO2 capture). I do believe nuclear has a place tho - diversification is security, but this might have to be subsidized rather than be naturally economically competitive.