Organisers cancel part of the event amid warnings of heavy rainfall, lightning and strong winds.
Buildings could also be damaged by lightning, hail or strong winds as well as floodwater.
Scottish and Southern Electricity Networks said electricity was lost shortly before 01:30 BST after a high-voltage overhead wire was damaged. Following repairs it was back on by 07:00. Organisers said: "Our priority is the safety of all of our athletes. Everything is exactly the same as it would've been, just without the swim."
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