S.Africa: 50% of electricity generators are offline – Eskom remains on a knife edge – My Comments


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[I saw back in about 2006 that the electricity from Eskom is going to be a problem in the future. I bought my first generator back then. Later, in 2015, I began with my solar panel and battery experiments. That was lovely stuff and my little solar power setup runs for me every day and I am expanding it. I love it. When the power goes out I just switch over to my batteries. I never lose working time due to electric power outages – NEVER. I'm always on the go. This system will never be fixed. The Whites are CONSTANTLY saving the Blacks from themselves. Jan]

Load shedding suspended but underlying generation capacity does not look good.

By Moneyweb 14 Oct 2021 00:01

It is not clear publicly just how bad the picture is across Eskom’s aging coal power station fleet.

Strong indications are that things are bad.

The utility has not published a weekly system status report since the start of October and its public data portal has not been updated since last Wednesday.

It says there has been a “fairly significant failure of the data support system” but that this “will be resolved soon”. It is unclear whether this and the failure to update its weekly system status reports are related.

What we do know is that Eskom is currently barely managing to generate 26 000 megawatts (MW) of power to meet peak demand in the evenings.

Factoring in the contribution from renewable generation at the peak, there remains a shortfall of between 3 000MW and 4 000MW to meet demand.

How Eskom managed to stick to Stage 2

To avoid Stage 4 load shedding this week – where 4 000MW of demand is removed – it is relying on most of its 14 open cycle gas turbine (OCGT) peaking plants and is cutting supply to its large industrial customers, including South 32’s aluminium smelters near Richards Bay. On Monday, it removed 1 200MW of supply to these customers.
Eskom warns of possible load shedding in coming days [Oct 7] Eskom extends scheduled power cuts until Thursday [Oct 9]

Eskom implemented Stage 2 (a shortfall of 2 000MW) load shedding from Friday (October 8). At that point, it said this would be until Thursday, October 14, at 5am. However, generating capacity has not improved materially since then.

Its 14 OCGT plants can generate up to 2 067MW of power. So far this week, it has been supplementing its baseload generation capacity at peak with as much as 1 800MW from these plants.
Monday October 11, 19:32 Tuesday October 12, 18:51
Total demand 31 023MW 30 207MW
Interruptible load supply 900MW 450MW
Virtual power station 278MW 206MW
Number of Eskom OCGTs utilised 12 11
Number of IPP OCGTs utilised 0 0
Renewable generation 941MW 1 603MW
Load shedding 2 052MW 1 938MW
Eskom generation capacity 26 272MW 25 968MW

When one removes the additional sources of generating capacity, in other words everything except coal, the picture starts to look problematic.

Peak generation capacity ±26 000MW
OCGTs ±1 800MW
Nuclear generation 1 846MW
International imports ±1 200MW (Cahora Bassa hydroelectric).

Imports were halved last Friday as maintenance started at Cahora Bassa. This will be restored to full capacity of around 1 200MW on Friday morning (October 15).

It is not clear how much of its pumped water generation capacity it is using at the moment, but it is highly likely that it is using these schemes to provide between 1 500MW and 2 000MW of power in the evenings (never mind using these to stave off a higher level of load shedding during the day).

This means its coal fleet is producing no more than 20 000MW of electricity at the peak. The number is more than likely around 19 000MW.

Capacity versus reality

Eskom says its installed capacity is 48 585MW. This includes non-commercial units at Kusile (likely two of the outstanding three).

Remove Koeberg, OCGTs and imports from this capacity, and you are left with around 41 000MW of coal capacity.

This means more than 50% of Eskom’s coal fleet is offline.

On Wednesday afternoon the utility announced the suspension of load shedding from 5am on Thursday, as planned, but cautions that “there are still significant risks to some generating units, which would force Eskom to implement load shedding at short notice should we lose any further generation capacity”.

Last week it said there had been breakdowns of generating units at Kriel, Tutuka, Grootvlei, Kendal, Kusile, Komati and Hendrina power stations.

It said “whilst still recovering four units at Tutuka, which had experienced conveyor belt failures, the fleet suffered a cluster of boiler tube leaks within a short period of time”.

Certain of these units will likely have already returned to service, but based on the peak generating capacity picture shared each evening, it is equally likely that other plants suffered breakdowns.

It says it expects units to return to service at Kriel, Majuba, Hendrina, Lethabo and Tutuka power stations overnight and over the next few days.

It says total breakdowns amount to 14 868MW of capacity, with planned maintenance at 5 277MW. These figures are virtually identical to the data shared on Friday night (14 982MW and 5 334MW). The explosion at Unit 4 at Medupi in August, which has left 800MW of capacity out of service for what is expected to be the next two years, is included in the planned maintenance figure.

CEO Andre de Ruyter told eNCA on Wednesday that the utility is working to avoid load shedding as the country heads into election season.

Source: https://www.moneyweb.co.za/news/south-africa/eskom-remains-on-a-knife-edge/

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