There are numerous options for super-cheap energy storage. They just aren't built out yet, because the money is better spent, still, on adding generating capaci

There are numerous options for super-cheap energy storage. They just aren't built out yet, because the money is better spent, still, on adding generating capacity. What is being built is factories to produce them. Excess renewable generation is not a problem; if there is too much sloshing on the grid, you turn them off.