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wingnut771 said:
Which people?
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Twitterers who comment on the 70% from Medupi and are like man if they were measuring it with all 6 generators it would be lower, when it's like actually no it wouldn't.
 
Lupus said:
Twitterers who comment on the 70% from Medupi and are like man if they were measuring it with all 6 generators it would be lower, when it's like actually no it wouldn't.
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Explain it to them like this:

EAF only tells half the story like Ah rating on a battery, useless without knowing the voltage in order work out the actual number of any meaning which is Wh.

Actually, on second thought, never mind.
 
wingnut771 said:
Explain it to them like this:

EAF only tells half the story like Ah rating on a battery, useless without knowing the voltage in order work out the actual number of any meaning which is Wh.

Actually, on second thought, never mind.
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Yeah :-P but it's the more I say it's literally availability
 
Explain EAF like this: Your phone only works 16 hours a day, it will at a random time every day switch off for 8 hours (70% EAF).
 
McRuder said:
Explain EAF like this: Your phone only works 16 hours a day, it will at a random time every day switch off for 8 hours (70% EAF).
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Well that is sort of what it is, but it's generally not random. Think of it more like us, we sleep for 30% of the day, but we're available for 70% of it, though what capacity we're at for that 70% is another story :-)
 
Lupus said:
Well that is sort of what it is, but it's generally not random. Think of it more like us, we sleep for 30% of the day, but we're available for 70% of it, though what capacity we're at for that 70% is another story :)
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EAF is the ability to meet demand.

because half the generation is broken, they can't meet demand (which is less than it was 20 years ago), EAF drops. What is it now? 50%?
 
wingnut771 said:
EAF is the ability to meet demand.

because half the generation is broken, they can't meet demand (which is less than it was 20 years ago), EAF drops. What is it now? 50%?
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56% now was at 49% at the start of the year, was at 58% for the middle of March.
Also no EAF isn't the ability to meet demand, that is demand management, yes EAF plays a factor but it's not the ability to meet it.
Also for those that Eskom was great in the old days, 70% EAF was what Eskom had until the early 90s, but demand was at 20 to 24GW and capacity was 28GW. Demand 20 years ago was around the same as it's now, demand has actually dropped in the last 12 years it used to be around 30GW and winter peaks would be 37GW but after 2015 that all changed
 
Lupus said:
56% now was at 49% at the start of the year, was at 58% for the middle of March.
Also no EAF isn't the ability to meet demand, that is demand management, yes EAF plays a factor but it's not the ability to meet it.
Also for those that Eskom was great in the old days, 70% EAF was what Eskom had until the early 90s, but demand was at 20 to 24GW and capacity was 28GW. Demand 20 years ago was around the same as it's now, demand has actually dropped in the last 12 years it used to be around 30GW and winter peaks would be 37GW but after 2015 that all changed
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Well it was above 95% in winter 2001:
Eskom-EAF.jpg
 
wingnut771 said:
Well it was above 95% in winter 2001:
Eskom-EAF.jpg
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85 to 1994
1680072930846.png
The EAF highest was 80.5% in 1993, peak demand in was 24GW in 1994 by the looks of it.


1680073038353.png

Looks like it was 92% in 2001, demand highest was almost 32GW in 2003

Then it seems in 2013 they cut too this which is fancy for the management to read :-)
1680073282172.png
1680073498379.png
No freaking demand in that report quite disappointing
2015 EAF, report changes again
1680073594030.png

Total Capacity in 2015
1680073664426.png
1680073685586.png
2018
1680073792959.png
2019 through to 2021
1680073839481.png

Here is up to 2022
1680073912419.png

So De Ruyter took over in 2019 when the EAF had already dropped from 78% in 2018 to 69.95% in 2019 and he's too blame? It kept dropping though to a dismal 62% in 2022, hate to see what 2023 would be.
 
Lupus said:
Well that is sort of what it is, but it's generally not random. Think of it more like us, we sleep for 30% of the day, but we're available for 70% of it, though what capacity we're at for that 70% is another story :)
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Easiest way to understand it in solar terms - capacity is kWp, EAF is %kWp used, demand is load.

If the load goes up, kW generated increases towards kWp, up till peak capability of the panels.

If demand goes up, EAF increases towards capacity, up till peak capability of the plant.

Assuming a normal clear day at midday, if you have 10 kWp of panels, a load of 8.5 kW and you're only generating 7 kW of power, then you have a problem.

If your plant can generate 1,000MW of power, your demand is 800MW and your EAF is 70%, you also have a problem.

It's pointless talking about EAF without cross-referencing the demand at that point in time. It's not the ability to meet demand, but it's proportionally linked to demand...
 
Mike Hoxbig said:
Easiest way to understand it in solar terms - capacity is kWp, EAF is %kWp used, demand is load.

If the load goes up, kW generated increases towards kWp, up till peak capability of the panels.

If demand goes up, EAF increases towards capacity, up till peak capability of the plant.

Assuming a normal clear day at midday, if you have 10 kWp of panels, a load of 8.5 kW and you're only generating 7 kW of power, then you have a problem.

If your plant can generate 1,000MW of power, your demand is 800MW and your EAF is 70%, you also have a problem.

It's pointless talking about EAF without cross-referencing the demand at that point in time. It's not the ability to meet demand, but it's proportionally linked to demand...
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Renewables actually use a different metric for EAF :-(. But EAF doesn't really follow demand trends either, that would be the capacity factor, if there is more demand the capacity factor would go up to meet it, but the capacity factor could never exceed the EAF. So yeah sort of linked in a roundabout way.
 
zolly said:
It's not bizarre. It's so Muslim people can break the fast for Ramadan.
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That makes sense I suppose. Though it's odd that the City would favour religion over the economy.

Are there many Muslim DA supporters?
 
vaakseun said:
That makes sense I suppose. Though it's odd that the City would favour religion over the economy.

Are there many Muslim DA supporters?
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What has the DA got to do with City Power and Muslims in JHB?
 
vaakseun said:
Are there many Muslim DA supporters?
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I take it you're not from Cape Town :laugh: The short answer is that yes, there are many Muslim DA supporters.

vaakseun said:
That makes sense I suppose. Though it's odd that the City would favour religion over the economy.
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Let's just say that if I was in the DA's shoes I would do the same thing. People talk about Cape Town being a "white city", but it's coloured, and a lot of those coloured people are Muslim. So ya, do the decent thing and protect your votes (two birds with one stone) by making sure people can eat when they need to break their fast at the end of the day.
 
Lupus said:
What has the DA got to do with City Power and Muslims in JHB?
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They don't. Cape Town has adapted its load shedding schedule to make sure there's no load shedding over the period where most Muslim people are breaking their fast for the day.
 
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