Now any renewable energy sources are relevant. Reserves of natural resources will soon be exhausted. In addition, their use leads to environmental pollution and dramatic climate change. I'm more interested in solar panels, the production of which is getting cheaper, and the efficiency is growing.
Recently, information has emerged about the possible future use of artificial suns, which has recently been successfully tested in China. Such suns can be very cheap sources of clean thermal energy. It is quite possible that other, new types of clean energy will continue to appear, since a lot of attention is now being paid to this.