"The attack was, of course, carried out with a sniper rifle. Let Venezuelans have no doubt that there are devil’s puppets behind this attack", Maduro said in an interview with a state-run TV broadcaster on Wednesday.
The president has called on the public to remain calm amid the power outage, adding that "very serious" damage had been inflicted on the power plant.
"It has been 55 hours since the onset of nationwide power outages in #Venezuela; 69% of the country remains offline after a new drop-in connectivity", NetBlocks wrote on Twitter.
Venezuela’s Communication Minister Jorge Rodriguez told Telesur TV on Wednesday that the country’s national energy supplier was working to restore electricity amid the blackout.
Rodriguez also wrote on Twitter the same day that Thursday would be declared a public holiday, keeping schools and companies across the country closed for a third consecutive day.
Over the past several months, Venezuela has repeatedly faced power outages. The largest blackout swept the country on March 7, prompted by what the authorities called US sabotage against the Guri dam.