Five of the ten countries which officially joined the European Union (EU) on 1 May 2004 - Czech Republic, Hungary, Lithuania, Slovakia and Slovenia - rely on nuclear energy to provide a fourth or more of their electricity needs, based on the IAEA's nuclear databanks.
In total, they have 19 operational reactor units. Their accession means that 13 out of the 25 EU member states produce electricity using nuclear power, and the total number of operational reactor units in the EU now tops 150.
Six nuclear plants are operating, two at Temelin and four at Dukovany, collectively supplying about a fourth of the country's electricity.
Four nuclear plants are operating at Paks, supplying about 33% of the country's electricity.
Two nuclear plants are operating at Ignalina, supplying about 80% of the country's electricity.
Six nuclear plants are operating at Bohunice and Mochovce, collectively supplying about 57% of the country's electricity.
One nuclear plant is operating at Krsko, supplying about 40% of the country's electricity.
The new countries will add to the overall use of nuclear energy by nearly 450 million people in the expanded EU. Before the expansion, about one-third of the world's nuclear-generated electricity was consumed in the EU. Nuclear was also the community's largest single energy source for electricity generation, ahead of coal at 29% and gas at 15%. As noted at a recent European energy conference attended by IAEA Director General Mohamed ElBaradei, nuclear's future is mixed and countries face important choices. Besides the five new EU countries, eight others operate nuclear power plants - Belgium, Finland, France, Germany, Netherlands, Spain, Sweden, and the United Kingdom. Of these, four (Sweden, Germany, Belgium and the Netherlands) have introduced phase-out programmes, while Finland plans to build more nuclear plants.
At the European energy conference, Dr. ElBaradei outlined three critical challenges facing nuclear power's future in Europe and other countries - clear global and national strategies for the management and disposal of spent fuel and radioactive waste; high levels of nuclear safety performance; and upgraded nuclear security.
The IAEA places high priority on addressing the safety of nuclear power plants in the European region, as elsewhere. The EU additionally has issued a package of safety and related measures to cover the future development of nuclear energy in the enlarged union. Global cooperation on nuclear power and safety issues includes expert peer reviews, the exchange of operating experience, and legal conventions.
All five new EU countries with nuclear plants, for example, have joined the international Nuclear Safety Convention that sets benchmarks linked to IAEA safety standards. Each filed national reports at the last review meeting in 2002.