British Energy said it had restarted production from one reactor at the Hunterston B nuclear power station and received permission to restart another at the Ayrshire plant.
The generator confirmed that reactor four at Hunterston B had restarted supplying electricity to the national grid on Sunday.
The restart came within a week of British Energy receiving permission from the Nuclear Installations Inspectorate to bring the reactor back on line.
Yesterday, British Energy said the inspectorate had given permission for reactor number three at Hunterston B to be restarted.
Both reactors had been shut down since last autumn to allow for inspection, repair and the preparation of safety cases related to boiler tube cracking issues.
Two reactors at Hinkley Point B nuclear station in Somerset were shut down for the same reason.
The company received permission yesterday to restart production from reactor three at Hinkley Point B.
On May 11 the inspectorate said production could be restarted from reactor four at Hinkley Point B.
A spokesman said preparations for the restart of reactor four were continuing. He said no significance attached to the fact it remained offline while Hunterston three had been brought back on line.
The permissions allow the four reactors to return to service at around 70% of full capacity.
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