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In 1954, engineers at the Obninsk plant southwest of Moscow connected a 5-megawatt graphite-moderated reactor to the Soviet grid and became the first station anywhere to sell nuclear electricity to paying customers, nearly three years before the West managed the same feat at Calder Hall.

On 27 June 1954, a 5-megawatt graphite-moderated reactor near Moscow became the first anywhere to sell nuclear electricity commercially — beating Britain's Calder Hall by nearly three years and starting a lineage that runs directly to today's VVER-1200 reactors being built in seven countries.

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