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(Bloomberg) — Power output at Europe’s newest reactor is set to hit a landmark 1,000 megawatts overnight as it ramps up toward full production, bringing some relief to the region’s strained market.

Finland’s Olkiluoto-3 nuclear unit will provide much-needed supplies to the Nordic nation’s taut power system when it reaches full capacity later this autumn, after imports from Russia were cut completely in May. The Finnish grid has warned of rolling power cuts this winter as Europe faces its worst energy crisis in decades. 

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The reactor, which cost operator Teollisuuden Voima Oyj roughly $6.4 billion and was once set to be the world’s biggest, has been in test stage since starting in March. 

Tests at the full 1,600-megawatt level will take place in early October, TVO said in a statement. Regular production will be reached in December. 

Europe’s Newest Reactor to Save a Part of Strained Energy Market

Output from the plant stood at about 960 megawatts on Wednesday morning.