President Nicolas Maduro, who was elected in April after the death of Hugo Chavez, later blamed the yesterday's backout on the "fascist right."
He called it "live sabotage on the electrical grid."
Maduro, a former union leader and bus driver, is struggling to establish the stature and following enjoyed by his political mentor Chavez, who died of cancer in March.
The December 8 municipal elections are considered a test of Maduro's popularity and performance since taking power.
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Power started being restored a few hours later.
Electricity Minister Jesse Chacon said the outage hit the metropolitan Caracas region and states in central and western Venezuela.
He said it started in the same place where a blackout in September left 70 per cent of the country without power for at least three hours.
Then, too, the leftist Maduro blamed his political opponents.
Chacon said a probe was underway.
State-run oil company Petroleos de Venezuela said its facilities were operating normally.
In Caracas, cars drove through darkened streets. Only hotels and other buildings with emergency generators had some light.
In April Maduro declared another electricity emergency and extended it in August for another 90 days, even though he said the sector had improved considerably.
Despite being one of the world's largest oil producers, Venezuela is regularly affected by power cuts.