The British government has launched an urgent investigation following a fire at an electrical substation that resulted in a blackout at Heathrow Airport, one of the busiest airports in the world. The incident, which occurred on Friday, disrupted the travel plans of thousands, grounding over 1,000 flights and leaving many travelers stranded.

Energy Secretary Ed Miliband expressed the government's commitment to understanding the events that led to the disruption, underscoring the need for improving infrastructure resilience in the nation. As Heathrow prepared to resume operations with over 1,300 flights on Sunday, officials faced the daunting task of addressing the backlog caused by the incident. By Saturday, more than 250,000 passengers had navigated through the airport with stable departures.

Initial investigations suggest the fire may have been accidental, but it has raised pivotal concerns regarding the integrity of the UK's energy systems. Experts, including Martin Kuball from the University of Bristol, opined that the fire served as a stark warning about Britain's aging electrical infrastructure. Emphasizing the urgency, Kuball criticized reliance on outdated technology in substations, calling for a modernization of the national grid system.

As the investigation unfolds, the government is under mounting pressure to address long-standing issues relating to transportation and infrastructure investment, particularly amidst constraints on public spending. Transport Secretary Heidi Alexander highlighted the importance of maintaining robust power systems for crucial infrastructure like Heathrow Airport, which consumes energy equivalent to that of a small city.

Preliminary findings from the investigation are expected to be available within six weeks, as authorities work diligently to ensure such incidents do not recur in the future.