Engineers were still dealing with the aftermath of the Oxford Street explosion more than 12 hours after the area was evacuated.
London's electricity supplier, UK Power Networks, confirmed its workers were on site on Friday (September 8) morning in Mayfair, Westminster.
The disturbance on Thursday (September 7) led to one man suffering from minor injuries.
In its most recent statement, the company said: "Our engineers were on site with the emergency services, following an incident last night in Oxford Street."
Part of London's busy shopping district came to a standstill on Thursday evening after a "small power network explosion" closed off the road between John Prince's Street and Holles Street.
Emergency services, including the police, ambulance and fire crews, attended to the incident outside the New Balance store, near John Lewis , where part of the pavement was left blackened.
Late-night shoppers fled the scene as smoke billowed in Oxford Street.
It is not yet clear what led to the explosion.
The cause of the incident is under investigation.
UK Power Networks added: "A t this time is that we are working with emergency services to establish the cause of the incident."
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