A significant electricity outage has been reported across a major swathe of London, with the affected postcodes listed and updates rolling in as engineers work to restore supply. Outages like this are unusual for the capital, where the grid is generally reliable, so when one lands it tends to cause a fair amount of local disruption — traffic lights out, shops and cafés closing early, and transport information screens going dark.
For visitors, the practical impact is usually limited but worth understanding. Underground lines and mainline rail generally have their own power arrangements, though signal failures can ripple out when stations lose supply. Contactless card payments stop working at tills without power, so carrying a bit of cash is a simple hedge. Mobile networks normally hold up fine, but a phone at low battery plus a dead laptop means you'll want offline maps already downloaded.
The good news is that London handles these events quickly. National Grid and local network operators typically publish live outage maps and restoration times by postcode, and most cuts are resolved within hours. If you're staying in an affected area, hotel front desks will know the local picture; lifts and key-card doors are the two things most likely to affect you directly.
Who should care? Anyone with a booking in the postcodes affected right now — check your hotel is reachable and plan a buffer on departure day. Everyone else can file this under 'rare, managed, not worth cancelling over'. London remains one of the easiest big cities to visit, and a power cut, while annoying, is a blip rather than a travel problem.
Full list of affected postcodes and updates via Secret London.
