Some rural areas are still experiencing power outages, reports say.
Energy minister Jesse Chacon apologized for the blackouts and congratulated Venezuelans for their calm despite the opposition’s “destabilizing efforts”.
Critics say the blackouts are due to a lack of investment in infrastructure.
Jesse Chacon said a metal grille had been tampered with and fell on electrical lines, causing a short circuit.
President Nicolas Maduro said the government would carry out an investigation, and a new security unit would be created to protect the electrical system from sabotage attempts.
Officials say the system has been fully restored everywhere, but accounts on the social network Twitter suggest that the blackouts lasted much longer outside the capital, Caracas, reports Irene Caselli in Caracas.
One woman has told the Associated Press news agency she did not believe “this tale about sabotage”.
“We all know who is to blame,” said Adriana Montoya, a housewife who said she was stuck for hours in traffic jams that formed as traffic lights went dark in Caracas, which lost power for five hours on Tuesday.
The blackout also partially disrupted the underground transport system, with people being stuck in trains in tunnels before being evacuated to safety.
Thousands of workers were sent home.
Nicolas Maduro blamed the opposition for “sabotage” to power transmission lines.
The president did not give any evidence to support the accusation, but said he had instructed the military “to protect the entire country”.
Opposition leader Henrique Capriles said the government was trying to divert public attention from Venezuela’s problems by concocting a conspiracy theory.
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