Fire crews are attending a blaze at a converter station at Hunterston for a £1bn, 260-mile undersea power cable between Scotland and England.
There are reports of an explosion taking place at the site, and images of smoke coming from the scene.
Scottish Fire and Rescue were called to the site near the Hunterston nuclear plant on Thursday afternoon.
Nobody is believed to have been injured in the blast and there is no danger to the public, STV reports.
It is used as converter station for a £1bn, 260-mile undersea power cable between Scotland and England.
STV report that the facility was visibly damaged by the explosion, with several pieces of outer cladding shaken loose.
Nearby buildings were evacuated but work at the nuclear station was unaffected.
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