More than 3000 people were reported to have been left without electricity after four faults restricted power distribution in the West End.
The unrelated faults are not believed to have been caused by the recent hot weather, although they have been exacerbated by the increased use of air conditioning.
The area first affected in Soho was bounded by parts of Oxford Street, Marshall Street, Regent Street, and Wardour Street, shortly before 10am yesterday. Power was restored at around 2pm.
Post facilities in locations including Wardour Street - home to audio facility Soho Studios and post house Ascent Media - had to temporarily close, and some had to farm out urgent work to other facilities.
The area bordered by Broadwick Street, Wardour Street, Regent Street and Piccadilly Circus also saw the power go down from 2pm until 6pm.
Parts of Noho (north of Oxford Street ) such as Wells Street - where both Frontier Post and one of Evolutions' buildings are based - and Newman Street were also affected from 6pm until 7.30pm.
Energy supplier EDF said that although they hoped to avoid further power interruptions in the area, there was a 'significant risk' that power interruptions could occur in the same blocks of Soho at the same times as yesterday.