afaik - the cable is used a lot, for months at a time when the gast turbines are undergoing maintenance the Island runs solely on the interconnector cable, so it is crucial it is safeguarded. I don't know if there is much export these days, there used to be times in the day when the UK grid price was high that it was profitable to export for the peak demand, but not sure if that's still the case (will have to ask my mole !)