South Africa power outages: some improvement but a long way to go before the grid is stable
By Hartmut Winkler - Professor of Physics, University of Johannesburg
Over the past few months, South Africa’s power generation sector has performed
better than expected. Four factors explain this: an acceleration of solar power installations, less frequent breakdowns at power stations, a less restricted supply of diesel and the return to operation of some units at Kusile coal fired power station.
Throughout most of this year South Africa experienced prolonged and damaging electricity shortages, making 2023
the worst year to date. The power utility Eskom confirmed this in its annual results presentation, in which it
said: “Eskom’s generating plant availability reached the lowest levels ever, due to unprecedented levels of unplanned unavailability.”
The percentage of functional power generating capacity, which was typically around 90% in the 1990s,
has dropped over the past few years. It was between 50% and 60% for most of 2023.
Is he right? Is the government’s optimism justified?
There is certainly reason to be pleased that the 2023 winter electricity shortfalls were less grave than expected, and that Eskom has booked some recent successes in its efforts to stave off further declines. But it’s too early to claim a turnaround, which requires fundamental medium-term measures and reforms.
Mitigating factors
In the last year, a number of factors have assisted in mitigating the power crisis.
Firstly, an acceleration of private solar power installations. The acute power shortfalls triggered a long overdue drive towards private solar rooftop installations. The move was boosted by government-promoted
tax incentives and
loan schemes.
According to estimates provided by Eskom, the capacity of private solar installations has risen by
349% between March 2022 and June 2023. The total peak generating capacity of these was in June 2023 expected to be almost 4,500 MW. As solar energy generation is limited to daytime sunny conditions, this translates to about 1,200 MW on average.
Secondly, less frequent breakdowns at the coal power station fleet, apparently linked to a decrease in sabotage activity.
The previous Eskom CEO claimed to have uncovered evidence of
massive sabotage at power plants. While the scale of such sabotage is uncertain, it is likely that at least some has occurred.
Thirdly, a less restricted supply of diesel.
In 2022 the power crisis deepened when Eskom
ran short of funds to purchase diesel. The power stations where electricity is generated from burning diesel are only envisaged as a backup during acute shortages, but have been kept running longer than intended.
Lastly, the return to service of some of the damaged Kusile coal power station units. This plant could, if fully operational, contribute about 15% of the country’s electricity needs.
The scale of the power shortage in the last year was largely due to multiple failures at Kusile. Kusile is the country’s newest large plant, but nine years after its initially projected completion date, two of its six units have
still not been finished.
On the down side, lengthy closures will be needed at some point to properly fix the flue ducts. It is also worrying that Kusile and the new Medupi plant have experienced so many failures already.
Persistent dangers
There are nevertheless signs that the recovery of the power generating sector is still far off.
The biggest threat is that the ageing and overworked coal plant fleet remains vulnerable to breakdowns.
Secondly, the life extension project for the country’s sole nuclear power plant, Koeberg, is progressing far too slowly.
Calls for its closure are gaining traction.
Koeberg’s operating licence expires in July 2024. If not renewed, Koeberg’s two units would have to be closed for good. That would result in a 4% drop in the country’s generating capacity.
To extend this licence for 20 years, the National Nuclear Regulator has requested significant plant upgrades and component replacements. This was in 2010 projected to
cost R20 billion (US$2.8 billion at the time) and require five months’ down time for each unit.
Given
bad planning and
delays so far, it is unlikely that work will be completed by the licence expiry date.
Thirdly, delays in the drafting of a revised national electricity plan highlight sharp disagreement within government on the solution.
Electricity generating infrastructure planning in South Africa is guided by Integrated Resource Plans that are supposed to be redone every two years. The country is currently using a plan
approved in 2019.
The delays probably reflect unhappiness in parts of the ruling party with a path that emphasises renewable energy. The minister of mining and energy, whose department is responsible for the energy plan, is known to
favour power generation from coal, gas and nuclear.
What’s needed
Without strategic alignment on how to address the electricity crisis, government won’t be able to develop new power plants. The old coal plants will not be as efficient as 20 years ago, and high breakdown levels will persist.
It therefore remains unlikely that South Africa’s electricity problems will end in the short to medium term.
This article previously appeared on The Conversation, it has been re-published on JoburgPost.com with permission.
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