Australian Daily Electrical Power Generation Data – Friday 21st June 2019

Posted on Sat 06/22/2019 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.

Friday 21st June 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 – 19730MW (3.45AM)

Daily Peak Power Consumption – 29930MW (6.00PM)

Daily Minimum Generated Power – 20100MW (3.45AM)

Daily Maximum Generated Power – 30200MW (6.00PM)

Average Total Power Generation – 25900MW

Total Power Generation In GWH – 621.6GWH

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 – 15820MW

Daily Peak Coal Fired – 19890MW

Average Coal Fired Generation – 17920MW

Total Generated Power – 430.08GWH

Average Percentage Of Total – 69.19%

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 – 1860MW

Daily Peak – 5470MW

Average Natural Gas Fired Generation – 2950MW

Total Generated Power – 70.8GWH

Average Percentage Of Total – 11.39%

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 – 5700MW

Average Renewable Generation – 4100MW

Total Generated Power – 98.4GWH

Average Percentage Of Total – 15.83%

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 – 930MW

Total Generated Power – 22.32GWH

Average Percentage Of Total – 3.59%

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 – 1450MW

Daily Peak – 4510MW

Average Hydro Generation – 2860MW

Total Generated Power – 68.64GWH

Average Percentage Of Total – 11.04%

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 6558MW, from a total of 54 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 – 480MW (2.35PM)

Daily Peak – 1430MW (11.30PM)

Average Wind Generation – 790MW

Total Generated Power – 18.96GWH

Average Percentage Of Total – 3.05%

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 35 solar plants is 2982MW.

Daily Minimum – Zero

Daily Peak – 1660MW

Average Solar Plant Generation for hours of generation – 1020MW (7.00AM till 5.30PM)

Average Solar Plant Generation across the whole 24 hour day – 450MW

Total Generated Power – 10.8GWH

Average Percentage Of Total across the whole 24 hour day – 1.74%

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 – 3330MW

Average For Hours of Generation – 1650MW (7.00AM till 5.30PM)

Average Rooftop Solar Generation across the whole 24 hour day – 720MW

Total Generated Power – 17.28GWH

Average Percentage Of Total across the whole 24 hour day – 2.78%

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 – 2300MW

Average Across the whole day – 1240MW

Total Generated Power – 29.76GWH

Average Percentage of Total across the whole 24 hour day – 4.79%

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 –  2300MW – 1.45PM – 9.91%

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 – 6.00PM – 1.99%

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

On the day which is traditionally the lowest power consuming day of the working week (Monday to Friday) power consumption did not fall anywhere close to what it usually does for a Friday. Winter has kicked in big time, and across most of Australia. Overall power generation for this day was 621.6GWH, at an hourly average of 25900MW, a fall of only 350MW when compared to the day before. This was the second highest day for power generation this week, and as a comparison, last Friday it was 9.1% lower, a full 2350MW lower.

The early AM Base Load was 300MW higher at 20100MW and that’s 2100MW higher than the year round average of 18000MW. The evening peak was 800MW lower at 30200MW, a total reached twice on this evening, once at 6PM, and then again at 6.40PM, but it was over 30000MW for an hour and twenty minutes. Across the five States with their individual peaks at differing times, the peak in New South Wales (NSW) was higher, up by 50MW over the high of the day before. In Queensland, the peak there was 300MW lower. In Victoria, their peak was 220MW lower. In the two States with the lowest power consumption, the peak in South Australia was 50MW lower and in Tasmania, their peak was 20MW lower. As a further indicator of just how much power is consumed in NSW, the largest power consuming State, the peak in that State alone made up 39.43% of all the power being consumed across the whole Country in this vast coverage area. That’s an astonishing amount of power just being consumed in one State at this time of peak power consumption, 11801MW out of a total of 29930MW.

Now, while the overall was slightly lower, the average for coal fired power was actually higher on this day, up to an hourly average of 17920MW, and that’s higher on this day by 240MW. The range between the high and the low for this day was 4070MW, and the maximum power generated from coal fired power was at that evening peak and it was 19890MW. The Unit which came back on line yesterday, Unit 1 at the Bayswater plant in NSW continued to rise throughout the early morning. However, at 4.30AM, it went back to zero output immediately. Then at 6.30AM, it came back on line, and slowly made its rise towards its maximum, and this time it stayed at a steady rise and by 10.30PM, it was back at 70%, and holding there for the remainder of the night. In Victoria, Unit 3 at the YallournW plant came back on line at 4.30AM, and it too made its way slowly towards its peak, and it reached that just before 1PM. There are now only four of those coal fired Units off line, three in Queensland, and one in Victoria.

Note that rise in the average for coal fired power, and then look at that maximum it generated for the day, 19890MW. With four Units off line, that means that 44 Units are currently on line and delivering their power. Those 44 Units have a Nameplate of 21500MW, so at that time of maximum power generation from those coal fired Units, they were delivering their power at a Capacity Factor (CF) of 92.5%. Also, those same 44 Units delivered more than 19000MW for more than seven continuous hours on this day, and that was at an average CF for those seven hours of 88.4%. Even including those Units which are off line, and taking the average for the day, then the CF for this day was 78%, proving their efficiency, but perhaps that best indicator of proficiency is that when needed the most (at that peak power time) they can deliver their power at 92.5% of their Nameplate, something that no other source of power generation here in Australia can even get close to.

The average for natural gas fired power was lower on this day, down by 540MW but still almost at 3000MW average across the day. The average for those smaller Other sources was also lower on the day, but still very high for this small source of power generation, at 930MW, lower on this day by 60MW. The average for hydro power was also lower on the day, down by 340MW, buat also close to that 3000MW average per hour. The average for solar plant power was higher by 60MW.

After two days when wind power has been at its absolute lowest for the year, the only way it could go was up, and that’s what happened today, but not by all that much really, as it was only 290MW higher to an average of 790MW, and that gave wind power a daily operational Capacity Factor of 12.05%, still less than half its year round average of 30%. At the evening peak, when the most power that can be generated is needed, wind power was only delivering 600MW, and that was only 1.99% of all the power which was needed at that time.

On a day when the overall went lower, and coal fired power rose, coal fired power delivered 69.19% of all the generated power needed across the whole Country.

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.