Eskom has warned coal suppliers it may halt purchases of the fuel because a nationwide lockdown to deal with the coronavirus pandemic has curtailed demand for electricity.

The force-majeure notice Eskom issued to miners follows a similar instruction to windpower producers two weeks ago as the utility struggles to honour contractual agreements. It’s another sign of the unprecedented effect the disease is having on energy markets, with crude oil trading at a negative price on Monday because of oversupply...

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