Eskom suddenly escalated load shedding to stage 4 on Tuesday morning after the state-owned electricity utility lost more generating units from its fleet.
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In an unprecedented development, Eskom has said it will implement load shedding on Easter Sunday, when demand from electricity users is low.
Emergency evacuation sirens, meant to warn Cape Town residents of a problem at the Koeberg power station, sounded on Thursday – but this was a false alarm.
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Eskom may continue with rotational power cuts after the Easter long weekend.
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At first it had planned to cut the power at night only. Now Eskom has said it will implement continuous load shedding until 5am on Friday.
Eskom has published a request for proposals to allow private producers to use land around its coal-fired power stations to build solar farms.
Eskom is scrutinising contracts to buy power from a government programme for private developers to quickly bring on board additional generation.
Eskom will again implement load shedding countrywide on Tuesday, with the rolling blackouts set to continue until Friday.