Australian Daily Wind Power Generation Data – Saturday 10 April 2021

Posted on Sun 04/11/2021 by


By Anton Lang ~

This Post details the daily wind power generation data for the AEMO coverage area in Australia. For the background information, refer to the Introductory Post at this link.

Each image is shown here at a smaller size to fit on the page alongside the data for that day. If you click on each image, it will open on a new page and at a larger size so you can better see the detail.

Note also that on some days, there will be a scale change for the main wind power image, and that even though images may look similar in shape for the power generation black line on the graph when compared to other days, that scale (the total power shown on the left hand vertical axis) has been changed to show the graph at a larger size to better fit the image for that graph.

Saturday 10 April 2021

Total Wind Power Generation

This image shows the total power generated across the whole day by every wind plant in this vast AEMO coverage area for Australia.

The total Nameplate for all these wind plants changes as each new wind plant comes on line delivering power to the grid. That current Nameplate is 8132MW, and this is from the current total of 67 wind plants.

Note that the shape of this wind power load curve does not follow the shape of the main load curve for total power generation, and that is seen in the image below, the solid black line across the top of the image for that graph. Wind power generates its power only when the wind is blowing, hence it does not follow the actual power generation Load Curve, which is also the the exact same shaped curve as for actual power consumption.

For this data, I have added the times for the daily minimum, and the daily maximum, to show how they do not correlate with the actual times of minimum power consumption (around 4AM each day) and maximum power consumption, the evening Peak. (at around 6.40PM in Winter and earlier during the Summer Months.)

Daily Minimum – 2085MW (12.15AM)

Daily Maximum – 4926MW (5.25PM)

Average Wind Generation – 3970MW

Total Generated Power – 95.28GWH

Percentage Supplied By Wind Power At The Low Point For The Day – 10.2%

Percentage Supplied By Wind Power At Peak Power For The Day – 4662MW of 24560MW – 6.35PM – 18.98%

Average Percentage Of Overall Total Power Generation – 18.5%

Daily Operational Capacity Factor – 48.82%

Wind Power Generation Versus Total Power Generation

This image shows the total power generated from all the wind plants in this AEMO coverage area, and compares it to the overall total generated power from every source of power generation, which is the black line at the top of the graph. Wind power is the green coloured area, along the bottom of this graph.

While the green colour in this image looks to be a different shape to the graph above, keep in mind here that the scale is completely different, and that green coloured Wind total is the same as for the image shown above, only with the scale changed so it can fit onto the graph.


  1. Finding Wind Power Average – On the graph, there are 25 hourly time points, starting with midnight and finishing with midnight. I have added the total at each of those hourly time points together, and divided the resultant total by 25 to give an average in MegaWatts. (MW)
  2. For total power in GWH, multiply the average daily power by 24, and then divide by 1000.
  3. For the Capacity Factor, that is calculated by dividing the average wind generation by the current Nameplate and then multiplying that by 100 to give a percentage.

Comments For This Day

This was one of those really rare days when wind generation was high, and that average of 3970MW gave wind generation a daily operational Capacity Factor of 48.82%. Now here, note the extreme irony when I mention that this was a day of really high wind generation, and even then, it still did not reach even HALF of its total Nameplate. That average for the day is the highest it has been since the 6th December last year, so it has taken four Months to have another of these good days. What it did make me do is to check back my records for the last now more than two and a half years. More than 850 days now, and in all that time, wind generation has only been above 50% on 20 occasions, only 20 times higher than HALF its total Nameplate. So, for an average, on one day every seven weeks wind generation will deliver a little more than HALF its total. That’s nothing better than absolutely pitiful.

Across the day wind generation delivered 18.5% of all the generated power, on its best day in Months, and still just 18%, and even that was on the day of lowest power consumption for the week.

Note also the difference between the low for the day and the high, and here that was just under 2850MW, almost 3000MW, so the variation from the low to the high was almost 60%, and the only reason it was that ….. LOW was that the low point for the day was in fact so high at almost 2100MW.

Okay, so now look at that upper graph there of just wind generation, and you can see that I have circled an area of time covering just four hours either side of Midday there. You can see that inside that circled area there are a number of spikes up and down. Now while they appear to look only quite small, what needs to be taken into account here is the scale of the graph, and how it is sized to fit the page that the graph is shown on, and that scale can be seen at the left side vertical axis showing total power in MegaWatts, and the scale is more cramped with these higher numbers. So, inside that circled area covering four hours, there are 18 separate times when power is lost and then gained back. This is those individual wind towers at the wind plants automatically turning off and then a little later back on again, only to then turn off again. This happens in high wind situations, which has been the case for this last day. Those towers turn off in high wind situations so that the blades do not destroy themselves, a factor in high wind situations with larger generators now being used, hence longer blades to drive that generator, and those longer blades have a higher tip speed, and if it gets too high, the blades will be destroyed, hence they turn off, an automatic setting for each tower, and when the wind abates a little, they turn back on, only to turn off again within minutes, hence the large number of power loss spikes you can see there. Now, while those spikes down and then back up look small, they range in size from 200MW to 500MW. Off and on and off and on etc etc. Eighteen times in four hours, so that’s happening every 15 minutes. Each time power is lost, it has to be made up from somewhere else, and with it happening as regularly as this, it would be a nightmare to try and control.

So, even when wind generation has a very good day like this (irony aside) it still has problems.


Anton Lang uses the screen name of TonyfromOz, and he writes at this site, PA Pundits International on topics related to electrical power generation, from all sources, concentrating mainly on Renewable Power, and how the two most favoured methods of renewable power generation, Wind Power and all versions of Solar Power, fail comprehensively to deliver levels of power required to replace traditional power generation. His Bio is at this link.