Correct Answer:
B. 10%
The correct answer is 10%. Nuclear power currently supplies approximately 10% of the world's total electricity generation, which, when translated into global primary energy demand, represents roughly 4‑5%. However, the most commonly cited statistic in such contexts is that nuclear energy provides about 10% of the planet's electricity.
Nuclear Energy's Global Share
- Electricity Generation Dominance: As of the latest data, over 430 nuclear reactors operate in more than 30 countries, producing around 2,600 TWh of electricity annually. This consistently accounts for about 10% of global electricity output.
- Primary Energy vs. Electricity: The question often refers to the "world energy demand" in the context of electricity. If primary energy (including transport fuels and heating) is considered, nuclear's share drops to around 4‑5%. However, standard multiple‑choice examinations use the electricity figure of 10%.
- Other Options Assessed: 5% is too low even for primary energy, and 15% or 20% would overstate nuclear's current global contribution. Only 10% matches the widely published statistic from organizations like the International Energy Agency (IEA) and World Nuclear Association.
- Future Projections: While some nations are expanding nuclear capacity to meet climate goals, its overall share has been relatively stable. In 2025, the 10% figure remains the correct benchmark.
Therefore, nuclear energy accounts for about 10% of world electricity demand.