The Council for Scientific and Industrial Research (CSIR) has released its annual statistics on power generation in South Africa for 2020.

The statistics reveal that load-shedding occurred for 859 hours of the year (9.8%) despite a reduction in demand during the national COVID-19 lockdown.

These rolling blackouts were driven by Eskom’s plummeting energy availability factor (EAF), which measures plant availability including planned maintenance, unplanned breakdowns, and energy losses not under plant management control.

“Eskom fleet EAF is on a declining trend and drove load-shedding events in 2020,” the CSIR noted.

Over the past year, Eskom’s power generation fleet delivered an average EAF of 65%, with the lowest figure of 51.7% being recorded on 31 December 2020.

The graph below shows the steady decline in Eskom’s EAF from January 2016 until January 2021.

Eskom EAF

While the CSIR has not yet provided an outlook for 2021 with respect to load-shedding predictions, a continued decline in EAF is likely to result in more intense load-shedding.

Based on last year’s trend, the average EAF delivered by Eskom for the year to date does not bode well for load-shedding in South Africa.

According to Eskom’s latest weekly generation availability report, the average EAF for the year to date is only 58.55%.

This may have been a significant factor in the recent implementation of stage 2 load-shedding as a result of the continued need for the power utility to burn emergency fuel.

The table below shows Eskom’s weekly EAF figures for the year to date.

Eskom EAF 2021

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