A minor fault at one of the plants at Marsa power station at around 5.15pm led to power cuts in a substantial area of the country including Birkirkara, Balzan and Sliema.
A spokesman for Enemalta said that the corporation's technicians and engineers were diverting the affected areas to other plants and the situation was expected to be back to normal within the hour.
Some areas were already getting their electricity back, he said.