Of course there is. Hydro storage is probably the biggest one that has been in use for decades. You pump water up a mountain during over supply and then let it

Of course there is. Hydro storage is probably the biggest one that has been in use for decades. You pump water up a mountain during over supply and then let it run down through turbines during times where there is no wind/solar etc. There are plenty other methods to store energy but most involve gravity. Batteries can be used for small scale rapid reactions to changes in demand or production. Actually fully switching to EVs as a side effect can create a distributed system of energy storage.