Heathrow Airport, which had halted all operations after a power outage caused by a fire at a transformer center in London, the capital of England, has resumed operations.

British Airways said that 85 percent of flights planned for today at Heathrow are expected to operate, but delays are likely.

Flight tracking site FlightRadar24 had reported that at least 1,351 flights would be affected by the closure of Heathrow, one of Europe’s busiest airports.