Europe's Largest Nuclear Reactor Begins Regular Output After 18-Year Delay.

Finland's Olkiluoto 3 nuclear reactor, Europe's largest, has begun regular output after 18 years of construction and technical issues. The reactor is expected to meet around 14% of Finland's electricity demand, reducing the need for imports from Sweden and Norway. The start-up boosts energy security in a region to which Russia has cut gas and power supplies. The controversial nuclear power remains a topic of debate in Europe, with Germany switching off its last three remaining reactors, while Sweden, France, Britain, and others plan new developments.