You’re being very dishonest again, and are consistently portraying things in the worst light possible. An individual system of pump hydro can be built much larg

You’re being very dishonest again, and are consistently portraying things in the worst light possible. An individual system of pump hydro can be built much larger than any realistic battery facility. There are enough viable locations that it will scale better than batteries. You need to let this go and stop BSing. There was no need for compressed air or thermal energy storage until recently. In fact, there were no large scale battery energy storage systems until recently either. All of them are starting to happen. Your point about low grade heat is entirely a red herring. It’s not even true as storage of low grade heat is valuable in a renewable energy world. But more importantly those energy storage can definitely store higher grades of heat. Especially if it is hot enough to drive a turbine, or used to that heat to make other systems more efficient. In large scale facilities, it is not meaningfully less efficient that batteries. So the conclusion is the same: there does not really need to be batteries for this purpose. You can eliminate them and save yourself the money. After all, you already admitted that you need those other systems anyways, so just have those other systems and not bother with batteries.