A spokesperson for GOSH said: “We have a very active annual preventative maintenance programme across our estate, including in theatres but as with most hospitals, on occasion some parts of our estate need urgent attention for safety reasons.”
The trust said the power cut incident happened in 2023, as the hospital experienced “a series of intermittent power outages due to a design fault within the electrical system.”
This was the only surgery under way at the time and a decision was taken to stop the operation and carry out the surgery at a later date.
The patient is “doing well”, the trust added.
The assessments, carried out in October, followed a review into poor care provided by Yaser Jabbar, a former paediatric lower limb surgeon at the trust.
Mr Jabbar left the hospital in 2023 after a report by the Royal College of Surgeons (RCS) found some of the surgery had been “inappropriate” and “incorrect”.
Great Ormond Street, which treats 76,000 children each year, was rated “good” overall.
Inspectors found trust as “good,” but said the level of governance was “inconsistent” in some speciality areas.
Staff in several parts of the hospital were not clear about who was responsible for clinical care – a concern previously raised by a Royal College of Surgeons review – the CQC said.