poweralert....

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Parched said:
OK, so in terms of balancing the system during evening peak 2400MW vs 900MW renewables has no impact at all, on OCGT usage, changes to load curtailment, etc? Interesting, thanks for the clarification. I would have thought that with coal units dropping off a higher contribution from renewables was a welcome offsetting factor last night, guess I have the wrong idea about how they operate and need to learn more about it.
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Yup non-dispatchable power isn't used to balance the system, look it helps out and probably stabilised a few things, but in their calculations on load shedding, load curtailment they can only work with the dispatchable figures they have at hand.
The problem with renewables is that it could be 900MW at 4pm and 2400 at 6pm and back to 900 at 6:30, it's not reliable to base numbers on. If you had overspecced it that we had 30GW of renewables and we were producing 10 to 20GW then you have a better idea if you could use it or not.
 
Lupus said:
Yup non-dispatchable power isn't used to balance the system, look it helps out and probably stabilised a few things, but in their calculations on load shedding, load curtailment they can only work with the dispatchable figures they have at hand.
The problem with renewables is that it could be 900MW at 4pm and 2400 at 6pm and back to 900 at 6:30, it's not reliable to base numbers on. If you had overspecced it that we had 30GW of renewables and we were producing 10 to 20GW then you have a better idea if you could use it or not.
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Which is why wind is pretty damn good.

You can watch the weather forecast here and pretty much predict what tomorrow's electricity price is going to be based on wind forecast.
 
Sinbad said:
Which is why wind is pretty damn good.

You can watch the weather forecast here and pretty much predict what tomorrow's electricity price is going to be based on wind forecast.
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Yeah it's good when it blows and bad when it doesn't, remember earlier this year and December the wind wasn't blowing. Also weather forecasts are only 75% accurate.
 
Wind forecasts here are generally pretty good.
Roaring 40s northern hemisphere equivalent, surrounded by sea...
 
wingnut771 said:
I see Eskom lost their data and went back in time:

Station build-up for the last 7 days - Eskom Data Portal

This shows how resources were used to build-up the demand over the past 7 days, and it includes both generation and demand side resources that Eskom has contracts with.
www.eskom.co.za www.eskom.co.za
View attachment 1512375
View attachment 1512377
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Do they even have data from the 90s? I'm under the impression that the ANC burnt any of the NATS documents needed to help run the country.
 
KatieKim said:
Do they even have data from the 90s? I'm under the impression that the ANC burnt any of the NATS documents needed to help run the country.
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Google Eskom report and the year you'd like to review it goes to the 80s
 
Update:

FRIDAY
All day stage 6

SATURDAY midnight - 5am stage 6
5am – 4pm stage 3
4pm – midnight stage 4

SUNDAY midnight - 5am stage 4
5am – 4pm stage 3
4pm – midnight stage 4


Deja vu :rolleyes:
 
Priapus said:
I wonder how long they’ll last. Those peakers are not meant to run that hard.
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Gas turbines are quite robust, and can run continuously with limited maintenance. They do eventually need to be serviced, probably 8000 hours (1 year) and refurbished after 24,000 hours (3 years). They are modular, and spares are freely available. The main issue is that when run so hard the cost of fuel consumed far exceeds the capital cost...

This link says they last much longer when used continuously compared to stop/start peaking use:
www.twi-global.com

Factors influencing maintenance intervals for gas turbines

By far the most significant factors affecting the maintenance interval are the type of operation (base load, peak load, trips, starts), the type of fuels used, the method of NOx control, and the quality of air entering the turbine.
www.twi-global.com www.twi-global.com
 
Gordon_R said:
Gas turbines are quite robust, and can run continuously with limited maintenance. They do eventually need to be serviced, probably 8000 hours (1 year) and refurbished after 24,000 hours (3 years). They are modular, and spares are freely available. The main issue is that when run so hard the cost of fuel consumed far exceeds the capital cost...

This link says they last much longer when used continuously compared to stop/start peaking use:
www.twi-global.com

Factors influencing maintenance intervals for gas turbines

By far the most significant factors affecting the maintenance interval are the type of operation (base load, peak load, trips, starts), the type of fuels used, the method of NOx control, and the quality of air entering the turbine.
www.twi-global.com www.twi-global.com
Click to expand...

Thanks for the info!
TIL
 
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