The entire country was affected by a general blackout yesterday, the second of its kind in just two weeks. According to the Superintendence of Electricity, it resulted from damage to the transmission lines in Haina that caused all the generators on the interconnected electrical system to collapse. Last night approximately one quarter of the 450 circuits in the country was still out of service. The general blackout began yesterday at 8:27 am due to damage on the 138-kilovolt sub-station in Haina, where the transmission lines of the Haina and Itabo generators meet. Later all petroleum and coal-fired generators went out of service, leaving just the hydroelectric generators to supply 10% of the demand.