It would be a market-based solution if the state wouldn't interfere with the markets in major ways. E.g. many battery projects in Germany are nonviable due to the fact that some less-efficient but cheaper battery technologies are verboten. Meaning the market gets screwed again. There are also fees and taxes on power transit that are set up in such a way that energy storage is disadvantaged compared to energy production, especially gas-based energy production. Hydro storage e.g. is comparable to gas peaker plants in the quickness of powering up/down, but hydro storage pays transmission fees twice, once to charge, once to discharge...