"The Forsmark 2 reactor was re-started and resumed generating power today," plant spokesman Claes-Inge Andersson told AFP.

Forsmark 1 was re-started on October 14.

The reactors in central Sweden were closed on July 25 after a short-circuit caused a blackout. Two of four backup diesel generators failed to start automatically, revealing other faults in the power station's electrical system.

Sweden's nuclear energy authority (SKI) gave the go-ahead for the reactors to start operating again on September 28.

Forsmark 2 would reach full production capacity on Friday, Andersson added.

Nuclear power accounts for almost half of all electricity generation in Sweden, which has 10 nuclear reactors, down from 12 since 1999 as part of a plan to phase out nuclear power over the next 30 years.

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