If something is a good idea, it should not need government subsidies, there should be plenty of private capital willing to fund it.
Batteries are a great idea except for the cost. Lots of bad economics comes for the ride with the bad science of catastrophic anthro. global warming.
Tell that to the railroad who were subsidized with so much free land along their original rights-of-way, or the oil companies who have been getting tax breaks for 100 years. Is there a good reason why solar and wind should not get similar consideration, or why oil shouldn’t have to stop sucking tit? Do we believe in fairness here?