Australian Daily Electrical Power Generation Data – Monday 30th July 2018

Posted on Tue 07/31/2018 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.

Monday 30th 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 – 18110MW

Daily Peak Power Consumption – 28300MW

Daily Minimum Generated Power – 18800MW

Daily Maximum Generated Power – 29000MW

Average Total Power Generation – 23700MW

Total Power Generation In GWH – 568.8GWH

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 – 14000MW

Daily Peak Coal Fired – 19100MW

Average Coal Fired Generation – 16900MW

Total Generated Power – 405.6GWH

Average Percentage Of Total – 71.31%

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 – 700MW

Daily Peak – 2650MW

Average Natural Gas Fired Generation – 1170MW

Total Generated Power – 28.08GWH

Average Percentage Of Total – 4.93%

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 – 4000MW

Daily Peak – 8000MW

Average Renewable Generation – 5630MW

Total Generated Power – 135.12GWH

Average Percentage Of Total – 23.76%

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 – 4500MW

Daily Peak – 4350MW

Average Hydro Generation – 2490MW

Total Generated Power – 59.76GWH

Average Percentage Of Total – 10.51%

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 – 2200MW

Daily Peak – 3600MW

Average Wind Generation – 3000MW

Total Generated Power – 72GWH

Average Percentage Of Total – 12.66%

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 – 550MW

Average Solar Plant Generation for hours of generation – 350MW (7.30AM till 5.30PM)

Average Solar Plant Generation across the whole 24 hour day – 140MW

Total Generated Power – 3.36GWH

Average Percentage Of Total across the whole 24 hour day– 0.59%

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 – 4100MW

Average For Hours of Generation – 2600MW (7.30AM till 5.30PM)

Average Rooftop Solar Generation across the whole 24 hour day – 1080MW

Total Generated Power – 25.92GWH

Average Percentage Of Total across the whole 24 hour day – 4.56%


  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

Again, this was the first day of the working week, and power consumption rose significantly, and following from that, so did power generation to cover that large increase.

The minimum power consumption that 4AM Base Load figure, rose by 880MW, and the evening peak was higher by a huge 2720MW, when compared to what it was on the Sunday. That increase in the peak power consumption is an increase of 10.6%, and that is a very large increase.

The average power generation from every source rose by 2200MW to an hourly average of 23700MW, an increase of 10.2%, and that would be close to being the highest single day increase in the time I have been collecting this data, and writing about it.

With respect to the mix of power generation, as you might realise, all of the sources had to increase their power generation when there is such a large amount extra required.

Here, even the power from the solar power plants went up today, not because of the increase in power demand, but just that it was a good clear day at most of those sites. That average for solar power of 140MW average across the day was the highest for the time I have been collecting the data, and even so, the power delivered by these solar plants was still just less than 0.6% of what was actually required.

Wind power again had a day when it was delivering its power at a very high level, and even though it was down on yesterday,  by 20MW, (the only source to decrease its output) it was still at 3000MW average per hour, and that gave wind power an operational Capacity factor for the day of almost 58%, and that percentage is just under twice the yearly average.

The average for natural gas fired power was higher by 340MW, and the average for hydro power was 440MW higher, so even though wind power was high, because the overall increased by such a large amount, then they were both called on to deliver more power, mainly to both cover that morning peak, because both then fell back at the time between the peaks to low levels.

Far and away the biggest increase for the day was from coal fired power, after it (euphemistically speaking) had a bit of a rest yesterday when consumption was so low. That average for coal fired power was higher by a whopping 1400MW, and consider here that there were still 5 Units off line across the three States which still have coal fired power, so there was no extra power to call on from Units coming back online, so those Units which were on line just ramped up across the day to deliver more power, again showing up the lie that coal fired power is too rigid because it cannot follow the load closely by ramping up and down on short notice, something that it DOES do on a daily basis. Note that when extra power is required, it’s not wind power or solar power which comes to the rescue, but the three main traditional sources of power generation, and especially coal fired power. Note that when the overall power generation increases by such a large amount, coal fired power still supplies the vast bulk of it, and in the case of this day, coal fired power still delivered more than 71% of all the power.

Now, I know I mentioned this last Monday, highlighting the difference between the power generation data, by comparing the Sunday weekend, and the working day Monday, but this day that gap was even larger, so it’s worth explaining it again, and with a closer look at what happened on these two days.

Look at these two images below, and as with all images I show here, they are sized to fit the page, but 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.

These are images for the total power generation from every source, and what you are looking at specifically here is that upper black line, the total power generation from every source with respect to the hours across the day. The image on the left is for the Sunday, and the image at the right is for the following day, the Monday.

Now, while I mentioned above that the peal power consumption and also the total power generation from every source were both more than 10% higher across the day, look now at that first daily peak, the morning peak.

The minimum power generation is almost the same for both days, around 18500MW, and at the same time, around 4AM, that Base Load figure I mention so often.

On the Sunday power generation rises slowly to that peak which was around 21500MW and it was at 9AM.

However, on the Monday morning that peak was 27500MW and an hour and a half earlier, at 7.30AM, and rose very steeply from the low point only a little more than three hours earlier. That’s a full 6000MW higher than it was on the Sunday.

That rise on the Monday was to a level 28% higher than for the day before. Being a work day, and also a school day, families rise earlier, when it’s colder, so the heaters go on, there’s the readying for work and school, and then when they leave, power consumption ramps up at work places and also at the schools as well.

That’s almost one third extra of that average power consumption for that time.

Then it continues during the day, to a slightly lesser level, when at that time between the peaks it is still almost 3000MW higher at that dip point at around 1.30/2PM, and then slowly rising to the larger evening peak, where it was 10.6% higher.

Now, wind power made no difference to what was happening at that time of the morning peak, because it was the same as what it was the day before, on the Sunday. Solar power, both sources here, from power plants and rooftop solar power, had no effect at all, because again, they were both similar to what they were yesterday.

Both hydro power and also natural gas fired power had both also fallen back to their lower levels, as they always do, and you can see that by looking at the respective images for both of those sources.

The only real change was with coal fired power. So, instead of doing what it did on the Sunday, ramping back as that dip came into play, and even though it did drop slightly on this Monday, it just stayed higher than for the day before across that period of time on this Monday working day.

Again, I can highlight another of those distinct advantages of coal fired power, one of the many things overlooked in this ‘meme’ to do away with coal fired power.

It delivers an essential service, and note that it delivers that at critical times too, not just part of the time, but for all of the time.

Coal fired power is much more important than it gets credit for, not that it ever gets any credit at all.

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.