Eskom has implemented a fifth straight day of controlled blackouts on Monday and will carry out more this week to prevent a total collapse of the electricity grid amid a shortage of capacity.

Eskom will implement stage-four load shedding until at least Tuesday as the effects of a tropical cyclone in Mozambique and problems at the company’s power plants continue to put severe pressure on the national power grid.

A huge study suggests the Apple Watch can sometimes detect a worrisome irregular heartbeat – but experts say more work is needed to tell if using wearable technology to screen for heart problems really helps.

Eskom quicky escalated its rotational blackouts from stage two to stage four on Saturday, despite demand over weekends typically being lower than on weekdays when industry is consuming more electricity.

Dimension Data senior managers are approaching lenders and investors to raise cash for a possible deal for the group’s Africa and Middle East operations, which could be valued at about $800-million.

African Rainbow Capital has attached an intrinsic value to telecommunications upstart Rain of R11.7-billion, or almost a third of Telkom’s market capitalisation.