Australian Daily Wind Power Generation Data – Tuesday 22nd September 2020

Posted on Wed 09/23/2020 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.

Tuesday 22nd September 2020

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 7728MW, and this is from the current total of 64 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 – 3896MW (2.05PM)

Daily Maximum – 4639MW (1.40PM)

Average Wind Generation – 4273MW

Total Generated Power – 102.55GWH

Percentage Supplied By Wind Power At The Low Point For The Day – 16.00%%

Percentage Supplied By Wind Power At Peak Power For The Day – 4158MW of 25600MW – 6.40PM – 16.24%

Average Percentage Of Overall Total Power Generation – 19.2%

Daily Operational Capacity Factor – 55.29%

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

Wind generation was very high for this day. That average of 4273MW gave wind generation a daily operational Capacity Factor of 55.3%. That total generation of 102.55GWH has only been exceeded six times in all the years wind power has been generating power here in Australia. So, this is the highest Nameplate wind power has ever had, 7728MW and six times wind generation has been higher. Even so, note the irony here that on the seventh best day in wind generation history, it could still only manage a little more than 50% of its total nameplate. The power deliver across the whole day here was just 19.2%, and with this as the seventh best day in its history, imagine how many more wind plants need to be constructed so it can AVERAGE 50% of all power delivery, let alone for us to rely fully on 100% renewable power, or more correctly named weather dependent power generation. The targets across Australia call for 50% renewables by 2030, so barely ten years from now, on the seventh best day EVER, it can only manage 19%.

Also of note here, again highlighting the now common failing of wind generation is that because there are so many of them in a limited area, when there are high wind situations, and the blades are turned off to protect them from destruction, when there are falls in power, they are sudden and they are very large in nature, and that huge loss of power in a short time has to be made up from other sources, and here that is mainly from natural gas fired power plants, so an excess of wind has become counter intuitive resulting in an INCREASE in CO2 emissions. That is again easily seen from today’s graph for wind generation, where there was another of those large falls in power. On this day, the highest total for wind power and the lowest total were only 25 minutes apart at around 2PM, when that loss of power came in at 743MW, a fall in just 25 minutes and the large part of that in a five minute time frame. This is no small loss as this is the turning off of 13 whole wind plants in South Australia, and a further two of them in Victoria. Wind speeds in that large coverage area were high at this time, and to protect the individual towers and their blades from destruction, they were all turned off at this time.

This is not how you operate a critical grid in a smooth manner. There’s no warning. They just turn them off, and it is in fact automatic. As soon as the wind reaches a certain speed, ALL the towers in that wind plant get turned off, and as you can see here, that was 743MW fall in power, the loss of around 15 wind plants and also around 1600 individual wind towers, all just immediately turned off.


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.