The power failure experienced between 5.55 a.m. and 7.00 a.m. yesterday was due to the explosion of an instrument called `Current transformer`, a high volt device, at the grid sub station in Kolonnawa, a senior Engineer of the Ceylon Electricity Board said yesterday.
He told The Island the cause of the explosion was due to an internal failure in the equipment itself and he termed it normal. The explosion is similar to the noise emitted by an exploding bomb.
He added that number of areas experienced power failures due to it as many high tension lines of hydro power systems collapsed.
He also said that they had experienced similar problems last year in Kelanitissa, however, the impact was less on those occasions because it took place at late night.
He added on average power could be restored between one and one half hours.