After years of chronic shortages causing rolling blackouts that constrained economic growth, Eskom has unexpectedly shifted to surplus power capacity. South Africa's state utility now confronts the unfamiliar problem of producing more electricity than demand warrants. Energy availability has climbed to 65%, with the country experiencing over 300 consecutive days without power interruptions – a stark contrast to the daily outages that plagued the nation for nearly a decade.

Chief executive Dan Marokane attributes the turnaround to an operational overhaul implemented two years ago, which restored broken units and improved plant management. However, challenges persist as the utility grapples with R130bn in unpaid municipal debts and ageing infrastructure. The majority of system breakdowns stem from obsolete control systems that have operated for 30-40 years, creating ongoing operational risks despite recent improvements.

The surplus has transformed Eskom's priorities from managing shortages to stimulating demand. While the utility plans to maintain 2-3 gigawatts of surplus capacity this winter, analysts caution that sustainability remains questionable should economic growth accelerate. The utility's funding model stays under pressure without more reliable revenue collection mechanisms from struggling municipalities, despite efforts to take over electricity distribution in those areas.