Published Wednesday, 25 July 2012
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Interview: Jamie Delargy
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The Moyle Interconnector, which is made up of two cables linking Scotland and Northern Ireland, has experienced four faults in the past two years.
It has the capacity to deliver as much energy as a power station, but the cable's insulation is breaking down in places, causing energy to leak into the sea.
The faults to date have cost over £30million to repair - the latest break is close to Scottish shores.
Paddy Larkin, of the interconnector's owners Mutual Energy, told UTV that the faults have been hugely disappointing.
"It's abnormal to have that number of faults at that age in the cable."
He admitted that "parts of these cables are not fit for purpose."
Scientific work is being carried out to determine the cause of problem.
Mr Larkin said that the solution is "to use the good parts of the cable to keep half of the interconnector running reliably."
However, this has not been done before.
The Energy Regulator Shane Lynch says he's confident there is currently enough supply.
"At present, we're comfortable we still have a significant margin over and above consumer demand - but that situation can always change.
"For example, if we were to lose other generation on the system it might become a little bit more critical."