Australian Daily Electrical Power Generation Data – Tuesday 10th September 2019

Posted on Wed 09/11/2019 by


By Anton Lang ~

This Post details the daily power consumption 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 the scale change for all of the images, and that even though they look similar in size of generation, 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 10th September 2019

Total Power Generation All Sources

Here, the total power generation from every power plant source is the top of the load curve, with each colour indicating a source of power generation. This is also similar to the total power consumption, which is slightly lower after minor grid losses are taken into account.

The dark grey colour is for the black coal fired power generation. The yellowish colour is for the brown coal fired power generation. The purple colour is for natural gas fired power generation. The blue colour is for Hydro (water) power generation. The green colour is for wind power generation. The red colour in the dip between the two peaks is for solar power plant generation. The other colours mixed in with the rest of them are from those smaller Other sources. Rooftop solar power is not included on this graph, as this shows just the power generation from all power plants only.

In the data below, both of those (exact) figures for total power consumption for the daily minimum and the daily Peak are taken directly from the AEMO site, adding up the totals for each of the five States in this coverage area. Also, note the slight difference between Total Consumed Power and Total Generated Power. That indicates some of the losses in the grid system

Daily Minimum Power Consumption – 18810MW (3.55AM)

Daily Peak Power Consumption – 27420MW (6.50PM)

Daily Minimum Generated Power – 19000MW (3.55AM)

Daily Maximum Generated Power – 27900MW (6.50PM)

Average Total Power Generation – 23550MW

Total Power Generation In GWH – 565.2GWH

All Fossil Fuels Total – Coal Fired and Natural Gas Fired Power Generation

Here, the upper black line is the total from all fossil fuels, and this is the same as for all three colours, the grey, dark yellow and purple colours combined in the image directly above.

The black line just under that top black line is the Sub Total just for coal fired power, and that is the same as the combined colours of the grey and dark yellow on the image above. Note here how closely that coal fired line follows the shape of the upper Load Curve, and this indicates that coal fired power can be ramped up and down to follow actual power consumption.

Daily Minimum Coal Fired – 13660MW

Daily Peak Coal Fired – 16940MW

Average Coal Fired Generation – 15260MW

Total Generated Power – 366.24GWH

Average Percentage Of Total – 64.80%

Natural Gas Fired Power Generation

This image for Natural Gas Fired Power Generation shows the gap between the total for all Fossil Fuelled Sources of power generation and Coal Fired Power Generation in the image directly above.

Note here how closely the shape follows the total power generation Load Curve in the top image, indicating how these natural gas fired plants are used to smooth out the load curve to match actual power consumption.

Note also that while coal fired power provides the bulk of the power, these natural gas fired plants are used to add more power to the system during those time periods during the day when consumption rises for the morning peak, and the main evening Peak

Daily Minimum – 2390MW

Daily Peak – 6190MW

Average Natural Gas Fired Generation – 3740MW

Total Generated Power – 89.76GWH

Average Percentage Of Total – 15.88%

All Renewable Power Generation Versus Total Power Generation

This Image shows just the gap between total power generation from every source and the total power from the three renewable sources only. It is the same image as the first image at the top here, only with the fossil fuelled total (the grey, yellow and purple colours) and those smaller Other sources removed from the graph, As in that top image, it shows Hydro Power, (blue colour) wind power, (green colour) and solar power. (red colour)  This image is used here to highlight the gap between the total power generation (that black line, which also includes RTS as well) and the total from renewable sources alone.

All Renewable Power Generation (Does not include rooftop solar generation)

This image is the same as for the one directly above for all renewable power, only with the total from all sources removed from the graph. As the scale of the left hand vertical axis has now changed, you can better see the detail of all renewable power. Again, the blue colour is for hydro, the green colour is for wind, and the red colour is for solar. The other colours you can just make out indicates smaller plants, mostly using biofuels as their fuel source, tiny plants adding up to a very small total and for a short time duration. 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 (4AM) and maximum power consumption. (around 6/6.30PM)

Daily Minimum – 2200MW

Daily Peak – 5400MW

Average Renewable Generation – 3470MW

Total Generated Power – 83.28GWH

Average Percentage Of Total – 14.74%

Generation From Other Sources

This image shows the power being generated from the smaller sources other than the major sources of power generation. These include Natural Gas/Diesel, Natural gas/Fuel Oil, Coal Seam Methane, Diesel, Kerosene, Waste Coal Mine Gas and Bagasse. All of these are fossil Fuels, excepting Bagasse which is sugar cane waste mostly used to provide main and auxilliary power at sugar mills.

Note the scale change here, as these are smaller producers of power, and the scale is changed so they can be more easily shown on the graph.

For the data here, I have just added the average generation across the day, the total generated power from all these sources, and the percentage of the total.

Average Generation – 1080MW

Total Generated Power – 25.92GWH

Average Percentage Of Total – 4.58%

Hydro Power Generation

This image shows all Hydro power generation. It is the same as the blue colour in the top image for power generation from all sources.

Again, note here that the shape of this load curve follows the shape of the main load curve for all power generation, in that it has similar peaks in the morning and for the main evening Peak. The coloured lines at the bottom of this graph indicate the power generation from each of the hydro plants in this coverage area.

Daily Minimum – 1070MW

Daily Peak – 4240MW

Average Hydro Generation – 2020MW

Total Generated Power – 48.48GWH

Average Percentage Of Total – 8.58%

Wind Power Generation

This image shows the total power generated by every wind plant in this vast coverage area. It is the same as for the green coloured line in the image at the top showing generation from all sources.

The total Nameplate for all these wind plants is 6702MW, from a total of 55 wind plants.

Note that the shape of this load curve does not follow the shape of the main load curve for total power generation. Wind power generates its power only when the wind is blowing, hence it does not follow actual power consumption levels.

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 (4AM) and maximum power consumption. (around 6/6.30PM in Winter and earlier during the Summer Months.)

Daily Minimum – 330MW (11.45AM)

Daily Peak – 1630MW (12.05AM)

Average Wind Generation – 770MW

Total Generated Power – 18.48GWH

Average Percentage Of Total – 3.27%

Solar Power Plant Generation

This image shows the total power generated from all the solar power plants in this coverage area. This is the same as for the red coloured area you can just see in that top image.

The total Nameplate for all these 41 solar plants is 3075MW.

Daily Minimum – Zero

Daily Peak – 2150MW

Average Solar Plant Generation for hours of generation – 1330MW (6.00AM till 6.00PM)

Average Solar Plant Generation across the whole 24 hour day – 680MW

Total Generated Power – 16.32GWH

Average Percentage Of Total across the whole 24 hour day – 2.89%

Rooftop Solar Power Generation

As this source of power generation is classed as ‘behind the meter’, it is not included in the total power generation. Note here that the State of Queensland (QLD on the legend under the graph) is broken down into four separate areas as this is the largest State with the largest number of installations.

While the total Nameplate changes often, the latest information is that the total is now 8000MW and higher, and that is a large total. However, that total equates to almost 2 Million homes with panels on their roof. That equates to an average sized installation of 4.3KW. Most of the power is consumed by the homes with the panels, and what is fed back to the grid is only consumed in the local residential areas. While seemingly still high this total is spread across that huge number of installations across the whole of this coverage area.

Daily Minimum – Zero

Daily Peak – 4600MW

Average For Hours of Generation – 2540MW (6.00AM till 6.00PM)

Average Rooftop Solar Generation across the whole 24 hour day – 1210MW

Total Generated Power – 29.04GWH

Average Percentage Of Total across the whole 24 hour day – 5.14%

Wind And Solar Power Generation Versus Total Power Generation

This image shows the total power generated from all the wind plants, and all the solar power plants in this coverage area, combined in the one image, and compares it to the overall total generated power, the black line at the top of the graph, which also includes RTS as well. Wind power is the green coloured area, and solar plant power is the red coloured area, and these are the same as shown in those other coloured images at the top of the Post.

I have also added the data below for the total generated power for both wind and solar plant power combined, and the percentage of the overall total below for the maximum power from both sources with respect to the overall total, both at the maximum for both, and then for the total for both at the daily peak Power time.

Daily Peak for Wind and Solar Plant Power – 2600MW

Average Across the whole day – 1450MW

Total Generated Power – 34.8GWH

Average Percentage of Total across the whole 24 hour day – 6.16%

Total Generated power at the daily maximum for both wind and solar plant power, the time of that maximum, and percentage of the total at that daily maximum –  2600MW – 1.25PM – 12.94%

Total Generated power for wind and solar plant power at Peak Power Consumption time for the day, and percentage of total at that daily Peak Power time – 600MW – 6.50PM – 2.15%

Overall Total With Rooftop Solar Power Added

This image shows the overall total generated power with Rooftop Solar Power (RTS) added to the total from all of the power plants. RTS is shown here as that orange colour added near the top of the graph in the middle, during daylight hours, and is indicated on the legend below the graph as Rooftop PV (PhotoVoltaics). The new overall total is that black line along the top of the Load Curve. Note here that with this RTS total added, the shape of the full load curve, the black line now looks almost exactly as Summer load curves used to look prior to the advent of RTS, and all those panels on roofs of private dwellings.


  1. Finding Averages – On each (non solar) graph, there are 25 hourly time points, starting with midnight and finishing with midnight. I have added the total at each time point together, and divided by 25.
  2. For both solar power averages, I have used the same addition of hourly time points and then divided by the same number of those time points of actual generation. Every so often, as the days get longer (or shorter after Summer) I change the hours of generation as those hours change.
  3. For total power in GWH, multiply the average daily power by 24, and then divide by 1000.
  4. The total percentages for coal fired power, natural gas fired power, all renewables, and those other smaller sources add up to 100%.
  5. The total percentages for Hydro, Wind, and Solar adds up to the total percentage for all Renewables.
  6. Total Generated Power is expressed here as GWH (GigaWattHours) and a GWH is a MWH (MegaWattHour) multiplied by 1000

Comments For This Day

Overall power consumption rose on this day, and here, let me point out something of interest. Those two daily indicators I use here, the early AM Base Load, (the minimum power consumption/generation for the day) and the evening peak, (the maximum power consumption/generation for the day) will, more often than not change on a daily basis, sometimes by large margins for both of them, and there are often occasions where one is higher and the other lower on the day, when compared with the previous day, so those two indicators are not really a guide as to what happens to the overall power consumption/generation across the whole 24 hour period. This is one of those days where those indicators showed exactly that, with the early AM Base Load higher, and the evening peak lower, and by a relatively large amount lower than for the day before. Now, even with that evening peak lower by so much, (and that fall was spread across four of the five States) the overall average (across the whole 24 hour day) was higher. That total power generation for this day came in at 565.2GWH, at an hourly average of 23550MW, and that was 300MW higher than the average for the day before this one.

That early AM Base Load was higher on the day, up by 400MW to 19000MW. (and that is well above the year round average of 18000MW) The evening peak was 800MW lower at the same time as usual, give or take 5 minutes or so, at 6.50PM, and that peak was 27900MW. Across those five States with their individual peaks at differing times, the peak in New South Wales (NSW) was 250MW lower. The peak in Queensland was actually higher) , up by 40MW. The peak in Victoria was 330MW lower. In the two States with the lowest power consumption, the peak in South Australia was 120MW lower, and in Tasmania, it was 70MW lower.

The average for coal fired power was higher on the day, (by a greater amount actually than the average) up by 410MW to an hourly average of 15260MW. The range between the low for the day and the high was 3280MW, and coal fired power generated a maximum on the day of 16940MW. In Queensland, Unit 3 at the Callide Power Plant went off line immediately at 8AM and after the problem was fixed, it came back on line at2.30PM, and by 5.30PM, it was back at full power output. There are eight of those coal fired Units off line, four in NSW, and two each in Queensland and Victoria.

The average for natural gas fired power was higher on the day, and a large amount higher too, up by 1550MW to an hourly average of 3740MW, the highest it has been for a while really. The average for those smaller Other sources was also way higher on the day, up by 410MW to an hourly average of 1080MW, and that’s the highest I have seen it since starting to record this data on a daily basis. It has only been higher than an average of 1000MW a very few times, and look at that coloured Load Curve image for those Other sources, and note that it was higher across the whole day, and way higher at those two peaks. The average for hydro was slightly lower on the day, down by 70MW when compared to the day before this.The average for solar plant power was higher by 40MW.

Now, as you might guess with the average way up for natural gas and Other sources, then it stands to reason the wind had a poor day, and that was the case. I mentioned yesterday that wind power was continuing lower on the day, and would continue lower on the next day as well, (today) and that was the case. That average for wind power was a huge 2040MW lower at an hourly average of just 770MW, a little more than a quarter of what it was yesterday, and only 20% of what it was just two days ago when it was so high, and this again highlights the variability of wind power, and how it can never be relied on to deliver power on the constant basis that power is required to be delivered. That average of 770MW meant that on this day, wind power had a daily operational Capacity Factor of of just 11.49%, so on average little more than one in ten of those 8000or so wind towers actually had their blades turning across this day. Luckily the low point for wind power actually coincided with the low point for power consumption across the day, at the low point between the two peaks for the day. Even so, that low of just 330MW at 11.35AM meant that wind power was only delivering 1.6% of all the generated power required for consumption across this vast coverage area. At the evening peak, wind power had (almost) doubled its power delivery to around 600MW, and that meant that wind power was supplying 2.15% of all the required power, and as the Sun had set, that was the total percentage supplied by all three of those renewables of choice, wind power and both versions of solar power.

Now, let me show you something here. While those three non coal fired sources are an indicator for the changes in wind power, note where I mention above the fact that hydro was actually LOWER on this day, so that looks to be anomalous in a way, considering I mention that those THREE sources are used to ‘moderate’ wind power when it is up or down. But all this actually indicates is the sources of power in each of the States. You have to have an idea of what is happening is each of the States to correctly explain what has happened here on this particular day.

Hydro power is the main source of power in the smallest (by State) power consumer in the Country, Tasmania, and hydro delivers the vast bulk of the power in that State. This is augmented by two reasonably large wind plants in the North East and North West of this Island State, Musselroe wind, and Woolnorth Wind. Now while wind power was very low across nearly the whole Country, there was a pickup in the wind late in the day, but only in Tasmania, at those two wind plants. You can actually see that on that chart for wind power, and I have included that image at the right here, and again, as with all images I show, if you click on the image it will open on a new page and at a larger size. Now this image differs slightly from the wind image above, but only with those coloured lines. The image above for wind power shows actual generation in MW, (shown down the left vertical axis titled as MW) while this image at the right shows the percentage generation (shown down the left, and now differently titled vertical axis shown as Capacity Factor in % terms) for those wind plants across the day. You will note however that the solid black line is exactly the same shape on both images, except that in that image above for total power in WM, it is sized differently top to bottom to better show it on the page, but that shape is exactly the same.

Now, note here on this image at right, that late in the afternoon and into the evening and night, two of those coloured lines rise considerably. Those two coloured lines indicate the only two wind plants in Tasmania, with the purple line showing Musselroe Wind Plant and the pink line showing Woolnorth Wind Plant. So, as you can see, Musselroe especially is up around 90% and Woolnorth is also well above the usual 30% average as well. Both of these wind plants have kicked in delivering the bulk of their combined 300MW of power right when it is needed the most, at that evening peak and after. Because those wind plants are indeed high, then less power is required from those main sources in that State of Tasmania, and as that is hydro power, and because these two wind plants are high, then less hydro power is required, and hydro power in Tasmania is a lot lower in that State, and that takes the overall for hydro power lower for the day. Considering that the evening peak in Tasmania (the smallest in the country) is only 1200MW, then these two wind plants are delivering almost 20% of that required power. So, while those three non coal sources are used to moderate wind power, there will be an occasional day, just like this one, where it looks otherwise, but you need to be aware of the power generation sources in each of those States.

On a day when the overall was a little higher, and coal fired power higher by a larger margin than the overall, coal fired power delivered 64.80% of all the generated power on the day.

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.