Australian Daily Electrical Power Generation Data – Saturday 24th August 2019

Posted on Sun 08/25/2019 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.

Saturday 24th August 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 – 17660MW (4.00AM)

Daily Peak Power Consumption – 23570MW (6.50PM)

Daily Minimum Generated Power – 18700MW (4.00AM)

Daily Maximum Generated Power – 23570MW (6.50PM)

Average Total Power Generation – 21300MW

Total Power Generation In GWH – 511.2GWH

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 ark 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 – 11420MW

Daily Peak Coal Fired – 16550MW

Average Coal Fired Generation – 14270MW

Total Generated Power – 342.48GWH

Average Percentage Of Total – 67.00%

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 – 460MW

Daily Peak – 2640MW

Average Natural Gas Fired Generation – 1200MW

Total Generated Power – 28.8GWH

Average Percentage Of Total – 5.63%

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 – 4400MW

Daily Peak – 6800MW

Average Renewable Generation – 5480MW

Total Generated Power – 131.52GWH

Average Percentage Of Total – 25.73%

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 – 350MW

Total Generated Power – 8.4GWH

Average Percentage Of Total – 1.64%

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 – 1000MW

Daily Peak – 2990MW

Average Hydro Generation – 1550MW

Total Generated Power – 37.2GWH

Average Percentage Of Total – 7.28%

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 – 2720MW (7.45PM)

Daily Peak – 3780MW (3.05AM)

Average Wind Generation – 3380MW

Total Generated Power – 81.12GWH

Average Percentage Of Total – 15.87%

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 – 1900MW

Average Solar Plant Generation for hours of generation – 1150MW (6.30AM till 6.00PM)

Average Solar Plant Generation across the whole 24 hour day – 550MW

Total Generated Power – 13.2GWH

Average Percentage Of Total across the whole 24 hour day – 2.58%

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 – 4420MW

Average For Hours of Generation – 2280MW (6.30AM till 6.00PM)

Average Rooftop Solar Generation across the whole 24 hour day – 1090MW

Total Generated Power – 26.16GWH

Average Percentage Of Total across the whole 24 hour day – 5.12%

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 – 5400MW

Average Across the whole day – 3930MW

Total Generated Power – 94.32GWH

Average Percentage of Total across the whole 24 hour day – 18.45%

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 –  5400MW – 12.15PM – 28.88%

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 – 2800MW – 6.50PM – 11.29%

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

As is usual for any Saturday, overall power consumption fell quite sharply, and the total power generation for the day came in at 511.2GWH, at an hourly average of 21300MW, and while that is a drop of 1450MW when compared to the average of the the working day Friday immediately prior to this (a drop of 6.4%) that total generated power is the same as for last Saturday and Sunday, similar for most weekend days at this time of the year.

The early AM Base Load was lower by 500MW to 18700MW and the evening peak was 2400MW lower, at around the same time at 6.50PM, and that peak was 24800MW, and that total was reached twice across a half hour time span as it dropped away by 100MW between those two same peaks. Across the five States, with their individual peaks at differing times, the peak in New South Wales (NSW) was a substantial 1330MW lower. In Queensland, it was 360MW lower. In Victoria, it was 840MW lower. In the two States with the lowest power consumption, the peak in South Australia was 20MW higher, and in Tasmania, it was 80MW lower. There was however one thing I did notice that happened on this day, a first in fact. The absolute minimum power consumption for the day is always at around that time of 4AM each and every morning, and it has been at that time since electrical power started to be generated and consumed. However, on this Saturday, the minimum power consumption was at 1.50PM, just after lunch, and at that traditional low point between the two peaks, only on this day, it went even lower and at that time the total power generation was 18300MW, and that was 400MW lower than the usual Base Load minimum at 4AM. That was due in the main to the total power generation from rooftop solar power, which at that time was 4100MW. However, something like this can only ever happen on weekends, when at that dip between the two peaks, it is lower, but never as low as this was. That’s because on weekdays, power consumption is considerably higher at this time with all of Industry and Commerce, (and here all the schools are in that Commerce sector) consuming what they normally do consume, and because they are closed for the weekends, then power consumption in those two sectors is quite a lot less, hence that lower dip, and with a slightly increased consumption in that Residential Sector, then that means with rooftop solar being consumed solely in that residential sector, then overall power consumption and from that, power generation will be lower on weekends, and that is why something like this showed up on this particular Saturday, and with Solar Insolation now improving with longer days and the Sun higher in the sky, then rooftop solar will only get larger. That low point has been evident in two States of late, South Australia, where overall power consumption is the second lowest in Australia at just 6.4% of the total power consumption, and occasionally in Queensland, but this is the first time that dip has been lower on a Country wide basis. It doesn’t mean that traditional sources will be soon closing down, as coal fired power still delivers the bulk of power at that time, and even on this day, coal fired power still delivered 63% of the total generated power at that low point on this particular day.

With the overall lower on this day, coal fired power was also lower, and it fell by 1410MW, almost all of that fall in the overall, and the average was 14270MW. The range between the low for the day and the high was 5130MW, and that is in line with the low for the day, as coal fired power ramped back considerably during the dip between the two peaks. The maximum generated by coal fired power on this day was 16550MW, also lower by around 1000MW. In NSW, Unit 3 at the Eraring plant went off line very slowly, spread out across almost 20 hours starting at 2AM, and not going fully off line until almost 10PM. Also in NSW, Unit 6 at the Vales Point plant went off line between 7PM and 9.30PM. There are eleven of those coal fired Units off line almost a quarter of the whole fleet of coal fired Units,three in Victoria, and four each in Queensland and NSW.

The average for natural gas fired power was lower by 670MW to perhaps the lowest I have seen it this last year, at an average of just 1200MW. The average for those smaller Other sources was also at a low point, an average of just 350MW, down by 160MW. The average for hydro power was also well down, lower by 470MW, and the average for solar power plants was also lower, down by 140MW.

The average for wind power after rising all day the day before stayed at or close to that high level across the day, the average higher by a substantial 1400MW to an hourly average of 3380MW, and that gave wind power a daily operational Capacity Factor of 50.43%, and that’s 20% higher than the year round average.

On a day when the average usually falls by a large amount, coal fired power delivered 67% of all the generated power.

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.