Russia, China, India, Hungary, and some newcomers like Turkey, UAE, Belarus, Bangladesh and Egypt are now building several reactors. But to increase power generation from nuclear fission, it is necessary to build more reactors to replace the reactors that will be shut down, which is not happening at the moment.
Assuming no change in current trends, the production of electricity from nuclear power will decrease at an unprecedented rate between 2030 and 2040.
The cost of generating electricity from oil, gas and coal is soaring. Their stock is not inexhaustible. These fossil fuels are playing a major role in global warming. Research has found that nuclear power generation is far more economical and environmentally-friendly than other fuel sources. Due to the lack of public support and the risk of another accident (like the Fukushima 2011 one), developed countries involved in nuclear technology are not taking the initiative to build new reactors.