Energy · 1954

Obninsk grid reactor

A 5 MW Soviet reactor becomes the first to feed a public grid.

The AM-1 reactor at Obninsk connected to the Moscow grid on 27 June 1954 with 5 MW of electric output. It demonstrated civilian nuclear electricity and ran until 2002.

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What it built on 1

Nuclear reactor 1942

Related measurements

The dashed line marks when it first worked.

Nuclear electricity generation Latest: 2.81k TWh (2025) Source: Our World in Data

Share of electricity from low-carbon sources Latest: 42.6 % (2025) Source: Our World in Data