A failure affecting four transmission lines on 2 September left four Brazilian regions partially without electricity, highlighting the growing strain on the country’s power infrastructure.

Power generation at the Itaipu hydropower plant was affected by the same issue, said the National Electricity System Operator (ONS).

ONS said that the outage affected all seven states in Brazil’s south and southeast regions, and another three in the north and the midwest. ONS said that about 5700 MW were lost through the outage. Most power service was restored in slightly more than an hour.

Power infrastructure bottlenecks are said to be becoming an increasing concern, hindering the economic growth of the country. In particular, concerns have been expressed over the capacity of the system to meet the surge in demand at the 2014 soccer World Cup and the 2016 Olympics.

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