NEW : about 40 percent of power restored by about 4 p.m. local time , official says . Venezuela mayor says explosion at power station is being investigated . Power went out across much of the country 4:30 `` Normally , these blackouts do n't occur very often , '' said Javier Alvarado , president of Caracas Electricity . p.m . ET local time ( 7 p.m. ) High temperatures cited as a contributing factor in the outages .
NEW : about 40 percent of power restored by about 4 p.m. local time , official says . Venezuela mayor says explosion at power station is being investigated . Power went out across much of the country 4:30 p.m . ET local time ( 7 p.m. ) High temperatures cited as a contributing factor in the outages .