By JARI TANNER

FILE – The turbine hall of the nuclear power plant Olkiluoto 3 ‘OL3’ is pictured under construction in Eurajoki, south-western Finland, March 23, 2011. Finland’s much-delayed and costly new nuclear reactor, Europe’s most powerful by production capacity, has completed a test phase lasting over a year and started regular output, boosting the Nordic country’s electricity self-sufficiency significantly. The Olkiluoto 3 reactor, which has 1,600-megawatt capacity, was connected into the Finnish national power grid in March 2022 and kicked off regular production on Sunday, April 16, 2023. (AP Photo/Lehtikuva, Antti Aimo-Koivisto, File)

HELSINKI (AP) — Finland’s much-delayed and costly new nuclear reactor, Europe’s most powerful by production capacity, has completed a test phase lasting more than a year and started regular output, boosting the Nordic country’s electricity self-sufficiency significantly.

The Olkiluoto 3 reactor, which has 1,600-megawatt capacity, was connected into the Finnish national power grid in March 2022 and kicked off regular production on Sunday. Operator Teollisuuden Voima, or TVO, tweeted that “Olkiluoto 3 is now ready” after a delay of 14 years from the original plan.

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