Thousands of homes across London were left without electricity following a fault on an underground cable.
The unplanned outage hit on the evening of Sunday 13 February and affected at least 38 postcodes across the capital.
Residents in Harrow, Wembley, Edgware, Stanmore, and Borehamwood were amongst those left in the dark.
National Grid ESO pinpointed a failure on the high voltage network as the cause of the outage.
Engineers from the system operator and from distribution network operator UK Power Networks worked to fix the fault, with supplies restored to most properties by 9:30pm.
However, some homes were without electricity until the early hours of Monday morning.
We apologise for the disruption to consumers in North West London who have been disconnected this evening.— National Grid ESO (@NationalGridESO) February 13, 2022
Some have already been reconnected and engineers are working hard to ensure that all consumers are reconnected as soon as possible.
Of course, this isn’t the first major outage to hit London. In 2003, a faulty fuse left 410,000 customers without electricity.
While 9 August 2019 saw more than a million people affected by a blackout following a lightning strike.