Are UK energy supplies in trouble after fire at French power link?

Fire at the National Grid IFA interconnector in Sellindge (UK) on 15 September Edward Evans/Bloomberg via Getty Images
On 15 September, a fire broke out at a facility which is part of the UK's largest electricity cable to continental Europe. This caused wholesale power prices to rise and raised concerns about tightening energy supplies in the future. Is the UK headed for a winter energy crises? Here's what you need to know.

What happened?

The fire broke out at Sellindge, Kent's converter hall, which uses DC electricity to run along the walls.