I can't really fathom living in a country where this is necessary. Is all of America's power grid this unreliable to where you'd need 40kWh of batteries just fo

I can't really fathom living in a country where this is necessary. Is all of America's power grid this unreliable to where you'd need 40kWh of batteries just for one house? We have geothermal + solar, but this seems overkill.