> A possible solution would be to have the EPA regulate the energy usage of miners and ban the product from the US if it fails energy regulations. The US does have some slice of the mining distribution so ASIC manufacturers will want to follow them to be able to sell their miners there.

Yup that would make sense, same could apply to the energy origin, to not allow mining activities if a certain percentage does not come from renewables. But I have doubts that the US government would have just the slightest interest to regulate in favor of crypto currencies. It always looks more that they would just like to ban them.