15 LARGEST Nuclear Facilities in the World Interesting! A Nuclear Power Plant is a thermal power station that employs a nuclear reactor to create a heat source. The heat generates steam to drive the turbines, which in turn produce electricity within their generators. As of 2022, there are 440 nuclear power plants operating across 33 countries and territories around the globe! But building these plants can be pretty tough, and take anywhere from five years to a decade to build, and can cost a fortune. But, they are proving to be more and more important as the world turns and as the need for renewable energies becomes more apparent. So join us for today’s video, where we look at the 15 largest nuclear facilities!