About of the world's electricity is generated from uranium in nuclear reactors. It comes from over 440 nuclear reactors with a total output capacity of about 390,000 megawatts (MWe) operating in 31 countries. Belgium, Bulgaria, Czech Republic, Finland, France, Hungary, Slovakia, Slovenia, Sweden, Switzerland and Ukraine all get or more of their electricity from nuclear reactors. The USA has just under 100 reactors operating, supplying of its electricity. France gets over of its electricity from uranium.