Hydropower appears to be the most important among the renewable energy sources, with a share of 15 percent. While Bitcoin still relies to a significant extent on burning coal, the share of that energy source is steadily declining. In 2020 it was still 40 percent, while today it is less than 37 percent. To become a truly clean industry, this percentage needs to fall even further, but Bitcoin is on the right track.
Energy mix depends on region
Incidentally, this does not mean that the energy mix for Bitcoin mining is the same all over the world. Countries such as Kazakhstan, where Bitcoin mining is extremely popular, still largely rely on fossil fuels. However, if you switch to countries such as Sweden, you will find that they run on renewable energy for 98 percent. The rise of nuclear energy and natural gas is mainly due to the relocation of the network to the United States.