Australian Daily Electrical Power Generation Data – Saturday 21st July 2018

Posted on Sun 07/22/2018 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.

Saturday 21st July 2018

Total Power Generation All Sources

Here, the black line is the total power generation from every source. This is also the same as for total power consumption, which is slightly lower after minor grid losses are taken into account.

The Blue line is all fossil fuelled power generation. The orange line is hydro power generation. The purple line is wind power generation, and the red line is for solar power generation.

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.

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 – 18900MW

Daily Peak Power Consumption – 27380MW

Daily Minimum Generated Power – 19600MW

Daily Maximum Generated Power – 28000MW

Average Total Power Generation – 23200MW

Total Power Generation In GWH – 556.8GWH

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 – 15300MW

Daily Peak Coal Fired – 17900MW

Average Coal Fired Generation – 16800MW

Total Generated Power – 403.2GWH

Average Percentage Of Total – 72.41%

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 – 1000MW

Daily Peak – 4550MW

Average Natural Gas Fired Generation – 1960MW

Total Generated Power – 47.04GWH

Average Percentage Of Total – 8.45%

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 blue line) removed from the graph, As in that top image, it shows Hydro Power, (orange line) wind power, (purple line) and solar power. (red line) What I have then done is added the black line just above those coloured lines and this indicates the Sub Total of power from those three renewable sources only. This is 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 orange line is for hydro, the purple line is for wind, and the red line is for solar, and the black line is the Sub total for all renewable power. The other colour just showing 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.

Daily Minimum – 3200MW

Daily Peak – 5400MW

Average Renewable Generation – 4440MW

Total Generated Power – 106.56GWH

Average Percentage Of Total – 19.14%

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 – 1750MW

Daily Peak – 4350MW

Average Hydro Generation – 2840MW

Total Generated Power – 68.16GWH

Average Percentage Of Total – 12.24%

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 just under 5225MW.

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.

Daily Minimum – 900MW

Daily Peak – 2150MW

Average Wind Generation – 1480MW

Total Generated Power – 35.52GWH

Average Percentage Of Total – 6.38%

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 16 solar plants is just lower than 1000MW.

Daily Minimum – Zero

Daily Peak – 500MW

Average Solar Plant Generation for hours of generation – 300MW (7.30AM till 5.30PM)

Average Solar Plant Generation across the whole 24 hour day – 120MW

Total Generated Power – 2.88GWH

Average Percentage Of Total across the whole 24 hour day– 0.52%

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 – 4000MW

Average For Hours of Generation – 2500MW (7.30AM till 5.30PM)

Average Rooftop Solar Generation across the whole 24 hour day – 1040MW

Total Generated Power – 24.96GWH

Average Percentage Of Total across the whole 24 hour day – 4.48%


  1. Finding Averages – On each graph there are 9 time points. Add the total at each time point together, and divide by 9. 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 average for a (half) Sine Wave which is 0.637 of the Peak value.
  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 and all renewables adds 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

This was the first day of the weekend, when power consumption, and power generation, falls markedly, and today was no different to earlier weeks.

While the minimum power consumption, that 4AM Base Load, was similar to the day before, just 80MW higher, the consumption at the peak in the early evening was 1130MW lower, a significant amount  lower than for a working day.

The average for power generation from every source across the whole day was 1400MW lower at 23200MW per hour, and that’s a percentage fall of 5.7% lower than the work day Friday, the day before.

The average for coal fired power was 300MW lower, and there were still seven Units off line, two each in Victoria and Queensland, and three of them down in New South Wales. That average from coal fired power of 16800MW was still 72.4% of all the power being delivered for consumption.

The averages for natural gas fired power (Minus 100MW) and hydro power (plus 100MW) cancelled each other out, and solar power was 30MW higher, still only making up 0.5% of the required power.

The big fall on the day was from wind power, where the average fell by 1130MW to 1480MW, giving wind power a daily operational Capacity Factor of 28.3%, but this week should be a good one for wind power, high on nearly all days of this week.

Even when overall power consumption was lower, you can still see that coal fired power supplied the major share, and because that overall was that significant amount lower, and with wind power lower, natural gas fired power and hydro were still similar to the day before, with the vast bulk of that drop taken up by the fall in wind power alone.

Coal fired power just keeps humming along as it normally does.

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.