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South Africa’s state-owned power firm, Eskom, has announced an intensification of its programme of planned power cuts.
Supplies will be cut off from 20:00 local time until 05:00.
The company said shorter blackouts would then be implemented until further notice.
Last week, President Cyril Ramaphosa declared a state of disaster to try to deal with the crisis.
Eskom is plagued by corruption, and has an ageing network of poorly maintained coal-fired power stations.
There have been power cuts in parts of South Africa every day since the beginning of the year.