Which country has the largest share of nuclear electricity in the world?

• A. France
• B. United States
• C. Japan
• D. Germany

Answer: (A)

The key idea is how much of a country’s electricity comes from nuclear power, not how much total nuclear electricity exists globally. France has built and continually run a large fleet of reactors, and its electricity system has relied on nuclear for a very large share of generation for decades. That strong, sustained reliance means a higher percentage of electricity from nuclear than the other options. The United States, while producing more nuclear electricity in total because of its size and many reactors, uses a much broader mix of fuels, so the share from nuclear is lower. Japan once had a substantial nuclear share but reduced it after the Fukushima events, and Germany has been reducing nuclear to zero as part of its phase-out. So France stands out as having the largest share of its electricity from nuclear among these countries.