> batteries are not suitable for extended periods Yet. It's just a matter of capacity. Yearly growth in grid storage is increasing at a rate even greater tha

> batteries are not suitable for extended periods Yet. It's just a matter of capacity. Yearly growth in grid storage is increasing at a rate even greater than solar. Crucially grid storage isn't limited by energy density, which leaves room for cheaper options – like sodium ion – which don't have the scaling bottlenecks of li-ion.