Australian Daily Electrical Power Generation Data – Sunday 12th August 2018 – Plus Weekly And Rolling Totals

Posted on Mon 08/13/2018 by


By Anton Lang ~

UPDATE: This will be the last Post in this Series for a short time, hopefully only three weeks. We are relocating home, and I will be offline as we pack here, and unpack at the new address. As soon as I am back online, I will be resuming these Posts on a daily basis, and I will be catching up all the data from tomorrow’s date, so the sequence will not change.

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.

Sunday 12th August 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 – 17530MW

Daily Peak Power Consumption – 26450MW

Daily Minimum Generated Power – 18400MW

Daily Maximum Generated Power – 27500MW

Average Total Power Generation – 21720MW

Total Power Generation In GWH – 521.28GWH

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 – 14020MW

Daily Peak Coal Fired – 17360MW

Average Coal Fired Generation – 15570MW

Total Generated Power – 373.68GWH

Average Percentage Of Total – 71.69%

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 – 560MW

Daily Peak – 3390MW

Average Natural Gas Fired Generation – 1220MW

Total Generated Power – 29.28GWH

Average Percentage Of Total – 5.62%

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.

Daily Minimum – 3600MW

Daily Peak – 6600MW

Average Renewable Generation – 4930MW

Total Generated Power – 118.32GWH

Average Percentage Of Total – 22.69%

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 – 1540MW

Daily Peak – 3830MW

Average Hydro Generation – 2190MW

Total Generated Power – 52.56GWH

Average Percentage Of Total – 10.08%

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 5414MW.

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 – 1760MW

Daily Peak – 3410MW

Average Wind Generation – 2570MW

Total Generated Power – 61.68GWH

Average Percentage Of Total – 11.83%

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 1344MW.

Daily Minimum – Zero

Daily Peak – 650MW

Average Solar Plant Generation for hours of generation – 370MW (7.00AM till 6.00PM)(Overcast and cloudy conditions at some sites)

Average Solar Plant Generation across the whole 24 hour day – 170MW

Total Generated Power – 4.08GWH

Average Percentage Of Total across the whole 24 hour day– 0.78%

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 – 3320MW

Average For Hours of Generation – 2100MW (7.00AM till 6.00PM)

Average Rooftop Solar Generation across the whole 24 hour day – 970MW

Total Generated Power – 23.28GWH

Average Percentage Of Total across the whole 24 hour day – 4.47%


  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 day is usually the day for lowest power consumption of the week, and that was the case for the day, albeit only slightly lower than for the day before, the Saturday. The minimum power consumption for the day at that 4AM point in time of the Base Load, it was 3300MW lower, while at the peak power time of 6PM, it was 1340MW higher than for the day before, and that’s interesting really, something I have noticed over the last weeks, that the Sunday peak is always a fair bit higher than it is on the Saturday evening. I could hazard a guess and conjecture that more people go out on the Saturday evening, and that on the Sunday evening, families are more often than not all at home, but that’s just a guess really.

The average for overall power generation from every source was marginally lower by 60MW per hour at 21720MW, and as is the case, the mix varied across the day.

The average for coal fired power was lower by 290MW, and two of those Units which were off line came back up during the day, in readiness for the larger requirements of the week days, one Unit in New South Wales, at the old Liddell plant, and one unit at the old plant in Gladstone in Queensland, so on this day, well, for part of it anyway, there were only seven of those Units off line.

The average for natural gas fired power was higher by 390MW, and the average for hydro power was lower by 310MW, virtually equalling their power delivery from the day before.

The average for wind power generation was higher by 150MW at 2570MW per hour, giving wind power a daily operational Capacity Factor of 47.5%

Even with coal fired power lower, it still delivered just under 72% of the overall power requirement for the day.


WEEKLY DATA For Week Thirteen.

Notes For Weekly and Rolling Totals

  1. Here, the Overall is 100%, so Coal + Natural Gas (NG) + Renewable adds up to that 100%
  2. Hydro, Wind and Solar add up to the total for Renewable.
  3. For the first Rolling Total, Rooftop Solar Power (which is behind the meter) is a percentage of the overall total and on top of that total.
  4. For the second Rolling Total, Rooftop Solar Power is added to the total overall power generation, and new percentages are calculated from that new overall total.
  5. Total Generated Power is expressed here as GWH (GigaWattHours) and a GWH is a MWH (MegaWattHour) multiplied by 1000.


Week           Overall        Coal         NG         Renewable        Hydro         Wind        Solar        Rooftop Solar

Week 13       3891.6      2735.04    245.28       911.28            429.84        456.24       25.2           214.08

Percentage of total        70.29%    6.30%       23.41%           11.04%        11.72%       0.65%        5.5%

COMMENTS for this week.

It’s interesting to watch these weekly totals and also the Rolling Averages below. I didn’t really think that they would correlate so closely with the other Series that I have been doing on the Base Load for he last year or more, but it’s surprising how close they really are, not in the actual numbers for the data but the trend. With that Base Load Series, I noticed that coal fired power always delivered more power in the Summer and Winter Months, and during the benign Months of Autumn and Spring, it delivered slightly less power, as more of those coal fired Units were off line for maintenance. The trend is similar in nature with this Series on the daily power generation for all sources of power, and again, keep in mind here that I only said the word similar, and with respect to this Series, that is more closely associated with the trend, especially for coal fired power. With that Base Load Series, coal fired power rises during the Winter, and then eases back slightly, and the same is happening here. At one time, coal fired power was delivering almost 75% of the power on a weekly basis, and that has been slowly falling as the end of Winter now approaches. As you can see from the average for this week, coal fired power is again ever so slightly lower, and is now only just over that 70% mark. Again, this is also due to more coal fired Units being taken out of service for maintenance with the onset of those benign Months when less power is consumed all round.

That lowering from the coal fired sector is made up with small increases in most other sources, all of them slightly higher, and that is most noticeable with both versions of solar power, due to the lengthening of the days, and greater insolation, hence greater power generation, albeit by only small amounts also. The power generated from the solar plants is up, but be aware here that it is still only delivering 0.65% of the power required. Similar also applies for rooftop solar power as well, again up, but also by not very much.

The total power delivered from all the renewable sources is up, but only by a little less than one percent. As I have often mentioned, and shown with the data itself, if wind power is high, then hydro power is lower, along with natural gas fired power as well, as those two sources are used to moderate wind power.

That total power delivered from wind power was again up slightly this week, and that total power delivered for the week saw wind power have an operational Capacity Factor for the week of just over 50%, well higher than the year round average of 30%


ROLLING TOTALS (In GWH) (Just power generation from power plants with rooftop solar behind the meter)

For these totals, Coal + NG + Renewable = 100%. Hydro + Wind + Solar = Renewable Percentage

Week                  Overall         Coal           NG         Renewable       Hydro        Wind         Solar        Rooftop Solar

After Week 13   51248     37561.44    3985.92       970.64            5437.22      4039.1     224.32          2037.3

Percentage of total             73.29%       7.78%          18.93%          10.61%        7.88%       0.44%          3.97%

ROLLING TOTALS (In GWH) (With rooftop solar added to the overall total, and new percentages calculated from that new overall total)

For these totals, Coal + NG + Renewable = 100%. Hydro + Wind + Solar + Rooftop Solar = Renewable Percentage

Week                  Overall         Coal            NG         Renewable       Hydro        Wind        Solar      Rooftop Solar

After Week 13   53285.3    37561.44     3985.92   11737.94          5437.22      4039.1      224.32        2037.3

Percentage of total              70.49%        7.48%       22.03%           10.21%        7.58%       0.42%         3.82%

COMMENTS for this week.

These figures for the Rolling Totals for power generation vary only slightly now that this Series has been running for a quarter of a full year, and the changes are only at the tenth of a percent mark or lower.

Note from the first Rolling Total, just power generated from all the power plants, coal fired power is still at just over 73%.

That total for power generated from all the renewable power plants was three tenths of a percent higher, mainly due to wind power having another good week. That total power from wind generation after 13 weeks gives wind power an operational Capacity factor of 34.2%, slightly higher than the year round average.

With respect to the second Rolling Average with rooftop solar power included into the overall, note how the renewables sector, now with an extra source comes in at 22% of all power being generated, an all total excepting that one are slightly lower.

Even so, the figure for coal fired power is still over 70%. That will fall slightly from now on.

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.