Last year nuclear energy generated 25% of the world’s clean (greenhouse gas emissions-free) electricity, and ranked second only to hydropower as a clean energy source, reported the World Nuclear Association (WNA) in its newly published “World Nuclear Performance Report 2023”. Total electricity generated by nuclear energy last year was 2 545 terawatt hours (TWh), and 2022 was the sixth year in a row that nuclear produced more than 2 500 TWh. However, the total nuclear generation figure for last year was slightly more than 100 TWh below the figure for 2021. This was largely due to three events in Europe. The need to carry out a series of welding repairs at nuclear power plants (NPPs), plus other outages, in France reduced that country’s nuclear generation by 81 TWh. Germany shut down three of its nuclear reactors at the end of 2021. And, the war in Ukraine forced the shut down of all six reactors at the Zaporizhzhia NPP.