“Economic problem” isn’t merely short form for “if we had a socialist system we could solve it with free money.” These solutions require us to dig huge amounts of minerals out of the ground and tear the earth apart in the process. And we’re already doing that at a rate exponentially larger than we ever have in history. Plus these are the same materials we need to build the batteries for EVs, so building them for grid storage competes with the EV transition.
And then you factor in the rapidly increasing electric demand we’re producing by switching over to EVs and that means the demand on the grid is even higher. The grid wasn’t built to be able to source power from everywhere so putting solar panels on everyone’s rooftops is making the situation even worse.