Green storage at scale does not exist yet because the equipment to do it has not been built yet. The equipment has not been built yet because the factories to

Green storage at scale does not exist yet because the equipment to do it has not been built yet. The equipment has not been built yet because the factories to build it are still under construction, and because money is still overwhelmingly better spent building out renewable generating capacity needed to charge it from. Storage you cannot fill up is wasted money. People responsible for keeping the grid operating are not at all worried about their ability to continue, using renewables and storage that will be built. In places and times where renewable generation falls short for longer than local storage can cover, energy will be imported from places with an excess, via transmission lines or shipments of synthetic fuel, most likely liquified anhydrous ammonia. Until that is available in sufficient quantity, they will burn NG during those shortfalls. The amount burnt will be much, much less than is today. Producing and then storing hydrogen underground takes very little of "hydrogen infrastructure". H2 may be generated, stored, and drawn down all within a single facility built over or near the underground storage cavity. The power involved may be moved in or out by transmission lines.