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By comparison, Heathrow is one of the country’s biggest consumers of electricity and requires as much power as a small city. What we know is that there was an unprecedented outage, and that it was not the result of a single point of failure on the electricity transmission or distribution system. The feed from North Hyde substation is one of three supply points to Heathrow, and the fire caused exceptional damage that took the whole substation out of service. The other supply points continued supplying to Heathrow Airport throughout the incident.