Wind farms are a joke, page-52

Thanks for confirming your ignorance. I strongly doubt anyone would be silly enough to want to use lithium batteries for grid-level storage. Nothing about them makes them suitable for that task.

No, the current growth industry is in what's known as flow batteries - particularly vanadium and zinc-bromine systems. In these, the electrolyte (the bulk material that actually stores the power) is a permanent asset - it doesn't wear out. The only parts that need to be maintained/replaced occasionally are the electrodes and the external equipment. Upshot: one solid capital outlay, and your ongoing storage costs are near nil forever more.

This goes even more so for Ambri's technology. It's essentially a great big tank with two layers of molten metal (chosen to be cheap and abundant as well as for their properties) separated by a molten salt layer. There is literally nothing in there to wear out - and if you decide for whatever reason to decommission one, on cooling all you have is a solid block of metal/salt which you can sell off to the nearest smelter.