Australian Daily Electrical Power Generation Data – Wednesday 10th October 2018

Posted on Thu 10/11/2018 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.

Wednesday 10th 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 – 17700MW

Daily Peak Power Consumption – 24400MW

Daily Minimum Generated Power – 18300MW

Daily Maximum Generated Power – 25400MW

Average Total Power Generation – 22100MW

Total Power Generation In GWH – 530.4GWH

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 – 13280MW

Daily Peak Coal Fired – 17570MW

Average Coal Fired Generation – 15940MW

Total Generated Power – 382.56GWH

Average Percentage Of Total – 72.13%

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 – 930MW

Daily Peak – 2470MW

Average Natural Gas Fired Generation – 1260MW

Total Generated Power – 30.24GWH

Average Percentage Of Total – 5.7%

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 – 3100MW

Daily Peak – 5700MW

Average Renewable Generation – 4420MW

Total Generated Power – 106.08GWH

Average Percentage Of Total – 20%

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 – 480MW

Total Generated Power – 11.52GWH

Average Percentage Of Total – 2.17%

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 – 720MW

Daily Peak – 2530MW

Average Hydro Generation – 1330MW

Total Generated Power – 31.92GWH

Average Percentage Of Total – 6.02%

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 5301MW.

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 – 2370MW (1.15AM)

Daily Peak – 3210MW (8.30AM)

Average Wind Generation – 2860MW

Total Generated Power – 68.64GWH

Average Percentage Of Total – 12.94%

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 1594MW.

Daily Minimum – Zero

Daily Peak – 780MW

Average Solar Plant Generation for hours of generation – 450MW (6.00AM till 6.30PM)

Average Solar Plant Generation across the whole 24 hour day – 230MW

Total Generated Power – 5.52GWH

Average Percentage Of Total across the whole 24 hour day – 1.04%

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 – 3470MW

Average For Hours of Generation – 1960MW (6.00AM till 6.30PM)

Average Rooftop Solar Generation across the whole 24 hour day – 1020MW

Total Generated Power – 24.48GWH

Average Percentage Of Total across the whole 24 hour day – 4.62%


  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

The overall figures for this day rose slightly, as consumption rose a little across the day. The average power generation per hour was 250MW higher, at an average of 22100MW per hour needed to fulfill demand, and while that change may seem small, there were some large swings across the mix of power generation. That variation in power consumption was from a minimum of 17400MW to a Peak consumption of 24400MW, and note here how that peak is considerably lower than what it is in the Summer Months and the Winter Months when it is usually up around 28000MW to 30000MW, and sometime higher even than that. It shows that power consumption in those benign Months of Spring and Autumn can be anything up to 4000MW to 6000MW lower, so those coal fired Units, needed so much in Summer and in Winter can schedule some down time for maintenance, when the need for large amounts of power is less critical.

The average for coal fired power generation was down by around 500MW, and because the total was slightly higher, then the percentage of power supplied from the coal fired source dropped slightly, to 72%, but as you can see from that, even on days when coal fired power does fall, those falls are only slight, and the percentage still sees this source with the bulk of supply. There were still ten Units off line across the three States still with coal fired power.

The averages for natural gas fired power and hydro power were also lower, because the average for wind power was way up on the figure for the day before. That average for wind power of 2860MW was around 1100MW higher than for the day before, and gave wind power a daily operational Capacity Factor of 54%. Even so, note that even on really good days, wind power is still only operating at half its total Nameplate. Also note here that we have a day when wind power shows a marked increase, and we also have days when wind power has Pretty substantial falls as well, and yet, the variation in coal fired power is only marginal, with the greatest adjustments for those changes in wind power coming from the natural gas and hydro sectors. What this indicates, and does so most effectively, is that wind power has very little, if any, and on most days no change on the power generation and delivery of coal fired power. For years now we have been told that wind power will take the place of coal fired power, and in fact, that is just not happening. Any changes are mainly taken up with those other two sectors, natural gas fired power and hydro power.

As an exercise in accuracy, I was wondering about the effect that the change to Daylight Savings Time was having on power generation data, as the time changes in all but one of those five States changed on the Sunday just passed. The effect might be that power consumption figures are evened out slightly, as people still do the things they always do at the same times each day, only now, those Peaks come at different times in the different States.

I gather those power consumption figures from the AEMO site, and the AEMO is the Australian Regulatory Authority for power generation and distribution. So, I telephoned them, and asked to speak with someone who could inform me of any changes that I needed to be aware with when it came to these changes in the data. The fellow I spoke with informed me that when it comes to the data recording, all the data is recorded with respect to the one single time, and that is the time in Queensland. This is because the generation of power is in real time, and they need to be aware of what the power figures are at every single point in time, so, for ease of recording, all data is recorded and shown at the same time across those five States. So, even though the time is different in three cases now, all data I collect is with respect to that point in time for Queensland, so for the minimum consumption, that is at 4AM each morning and for the evening peak, it is at 6PM, and that will change slightly as Summer comes on, but only to 6.30PM.

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.