In the future, Bitcoin miners will likely rely on the cheapest energy sources, with renewables, particularly nuclear, being the most probable.
"Bitcoin miners are incentivized to find the cheapest forms of energy possible in order to maximize profits most of the time this means using energy that would otherwise be wasted like flared gas sometimes it means using very dirty energy like coal but since we're talking about the Future Let's think about the future which energy source will be cheapest in the coming years well the answer is likely Renewables specifically nuclear"