Australian Daily Electrical Power Generation Data – Tuesday 23rd October 2018

Posted on Wed 10/24/2018 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 some of the images. That scale (the total power shown on the left hand axis) has been changed to show the graph at a larger size.

Tuesday 23rd October 2018

Total Power Generation All Sources

Here, the black line across the top of the graph shows the total power generation from every source. 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. 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 – 16900MW

Daily Peak Power Consumption – 23840MW

Daily Minimum Generated Power – 17200MW

Daily Maximum Generated Power – 24500MW

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 the blue line in the image directly above.

The black line just under that top black line is the Sub Total just for coal fired power. 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 – 14520MW

Daily Peak Coal Fired – 17700MW

Average Coal Fired Generation – 16390MW

Total Generated Power – 393.36GWH

Average Percentage Of Total – 76.95%

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 – 2910MW

Average Natural Gas Fired Generation – 1160MW

Total Generated Power – 27.84GWH

Average Percentage Of Total – 5.45%

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 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) 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 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 – 2000MW

Daily Peak – 4600MW

Average Renewable Generation – 3360MW

Total Generated Power – 80.64GWH

Average Percentage Of Total – 15.77%

Generation From Other Sources

This image shows the power being generated from the seven 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 – 390MW

Total Generated Power – 9.36GWH

Average Percentage Of Total – 1.83%

Hydro Power Generation

This image shows all Hydro power generation. It is the same as the orange line 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 man 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 – 860MW

Daily Peak – 2180MW

Average Hydro Generation – 1290MW

Total Generated Power – 30.96GWH

Average Percentage Of Total – 6.05%

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 purple coloured line in the image at the top showing generation from all sources.

The total Nameplate for all these wind plants is 5421MW.

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)

Daily Minimum – 101MW (2.00AM)

Daily Peak – 2490MW (3.00PM)

Average Wind Generation – 1710MW

Total Generated Power – 41.04GWH

Average Percentage Of Total – 8.03%

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 line you can just see in that top image.

The total Nameplate for all these 25 solar plants is 1820MW.

Daily Minimum – Zero

Daily Peak – 1010MW

Average Solar Plant Generation for hours of generation – 700MW (6.00AM till 6.30PM)

Average Solar Plant Generation across the whole 24 hour day – 360MW

Total Generated Power – 8.64GWH

Average Percentage Of Total across the whole 24 hour day – 1.69%

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 7800MW, and that is a large total. However, that total equates to 1.8 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, while seemingly still high is spread across that huge number of installations across the whole of this coverage area.

Daily Minimum – Zero

Daily Peak – 4040MW

Average For Hours of Generation – 2140MW (5.30AM till 7.00PM)

Average Rooftop Solar Generation across the whole 24 hour day – 1200MW

Total Generated Power – 28.8GWH

Average Percentage Of Total across the whole 24 hour day – 5.63%


  1. Finding Averages – On each 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. For coal fired power, I do this on a State by State basis (for the 3 States with coal fired power) and then add the total for each State together.
  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.
  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

Power consumption and power generation both rose today, albeit by only 300MW (around 1.4% higher than yesterday) and the mix varied as it always does.

The average for coal fired power rose by almost the same as that overall rise, (250MW higher) and another of those Units came back on line, so that now, there are only eight Units down.

The average for hydro was down by a little, and the average for natural gas fired power was up by 330MW, so, from that and with coal fired power all but covering the overall rise, you can guess that the average for wind power was down, as was the case, lower by 300MW, and it will be considerably lower again tomorrow as another large High Pressure weather system moves over the area with the greatest concentration of wind plants. That average for wind power of 1710MW gave wind power a daily operational Capacity Factor of 31.5%, slightly higher than the year round average.

Both versions of solar power were slightly lower, despite the lengthening number of daylight hours as we approach Summer.

Keep in mind how I have been mentioning that wind power has little if any effect on coal fired power generation. So now, look closely at the Load Curve for coal fired power. (the lower black line on that second image from the top above) Note that in the time between the morning and evening peaks, from 8AM till 6PM, there is only the slightest dip in power generation from those coal fired plants. That is the time when both versions of solar power are at their best, during those daylight hours, especially around the 10.30AM to 3.30PM time when solar is at its peak, and note that coal fired power hardly dips at all, in fact, no more than it always does at that same time every day. So, in fact, solar power is also not affecting the power generation from coal fired power.

So, no matter what anyone of a green persuasion tries to tell you that solar power will see the death of coal fired power, that’s not the case at all. That’s not just my saying that to make a point or because I might be perceived as a lover of coal fired power. No, here, the actual data is bearing that out.

Again, note here that with coal fired power regularly averaging around the 71 to 72% mark of all generated power for the last couple of weeks, that was substantially higher today at almost 77%, and that’s with eight Units off line, and that’s two week days now it has been as high as that.

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.