Government officials have in the past said that high energy consumption at peak times and poor maintenance of transmission lines have led to a high incidence of cuts.

In 2010 the late President Hugo Chavez signed a decree declaring an "electricity emergency" to help his government tackle power shortages.

The opposition says the government of Mr Chavez and his successor, Nicolas Maduro, may have spent billions of dollars on programmes to garner votes from the poor but has failed to invest in the upkeep and expansion of the electrical grid to meet growing demand.

Although Venezuela has big oil reserves, it is dependent on hydro-electricity for some 70% of its power.

Power cuts are common in Venezuela, especially in the country's interior states, but rarely affect the capital, Caracas.

http://www.bbc.co.uk/news/world-latin-america-23954514