Eskom’s warning that the country was threatened by months of rotating blackouts became a reality in less than 24 hours. The state-owned company, which produces most of South Africa’s power, said on Wednesday that controlled blackouts could return and last throughout the year. Even more concerning is that the company expects energy availability of the system will keep declining into early next year and probably only recover to current levels in six months. By Thursday, Eskom announced it was cutting 1GW from the grid. It doubled that amount on Friday in an outage that’s scheduled to last 13 hours. For...