If I recall correctly, Switzerland has a lot of gun control laws that dictate who can own a firearm, when and where the firearm can be used, and ownership requires strict training and licensing that often comes from the compulsory military service that the country requires. All of that would be great to have here in the US since the little tidbit about guns in our rule book mentions a well-regulated militia.
The physical battery idea has been a thing for decades in the form of a pump storage plant where during times of excess electricity, they pump water up a hill, and when power is needed it works like a hydroelectric power plant. The problems with these however is that in order to get a meaningful amount of power and longevity, you need a lot of water and space to build one of these which makes them massive and expensive up front. I have one near me, but I also live near one of the biggest lakes in the world, which helps.