To provide further detail, the display section of deSide also contains a region-specific tab for each region (i.e. 5 in total) where this data is provided in further detail. Each of the 5 pages is identical in structure – just with data for a different region in focus. Different colours are used in the charts to help highlight the different region.
A screenshot for the NSW region is shown below.
Price Estimates Table
At the top of this section you will see the following pieces of information:
- Clock Time – the PC clock time on your system.
- Current Trading Time – the given dispatch/trading interval.
- Cumulate Price – the rolling sum of 7 days of trading prices.
Then, under the Price Estimates heading you will then see table of tradings prices and trading price forecasts where:
- The first cell displays the actual trading price for the immediately preceding 5-minute interval;
- The second cell displays the actual trading price for the current 5-minute interval;
- The third cell displays the forecasted trading price for the next 5-minute interbal;
- The next series of cells with the label ‘p5’ show the pre-dispatch 5 minute estimates;
- The following series of cells then show the pre-dispatch 30 minute estimates as far ahead as the data is available.
In addition, please note these two tips about these charts within deSide:
|To customize the chart …||For any graph, if you hold down the left Shift key, and click on the title of the graph, you can directly change all the nitty-gritty details of the graph (including what is displayed, how it is displayed, and whether or not to show the legend).|
|To add a price threshold to the chart as a horizontal line …||This page has been provided to explain how you can do this.|
Regional Trading and History Chart
This is the same chart for the region as is displayed on the map on the “Whole of NEM” tab. Please read the desctipion of the chart on that page to undertsand the different elements of this chart.
The table of prices shown on the right of the display are a set of peak price forecasts under a range of sensitivity scenarios whereby AEMO says, in effect “now what would the price be, instead, if the QLD demand were higher (or lower) than what we have assumed by 100MW?” (or 200MW, and so on).
As shown in the image above, we’re using the NSW region tab as an example so the prices shown are all for the NSW region.
Note in this image that the colour-coded cells are mostly the same colour, because prices were flat at the time this image was taken. The +500MW and +1000MW sensitivity scenarios deliver higher peak NSW prices, which is understandable given the large change in demand this would entail.
Conversely, when times arise when the supply/demand balance is tighter (hence where rebidding, or unit trips, or other events are more likely to lead to price spikes):
- the colouring in the table makes this easy to see in relation to peak price; and
- the spread of the grey lines in the chart also provides an indication of the sensitivity of the price forecast to relatively smaller (±200MW) changes in demand throughout the span of predispatch.
Note: This article on WattClarity may be useful to you to understand this table, as it contains a brief analysis of price sensitivity during an ‘extreme’ dispatch interval.
The map, at the bottom of this page, conveys the same information as the map on the “Whole of NEM” tab, except that here the given region is in focus. Please read the explination on that page to understand the different elements on that chart.
- Demand – Total Scheduled Demand for the region
- Available – Total Availabile Generation Capacity
- Surplus – Surplus Available Generation over Demand. The lower the surplus, the higher you’d expect the price to be in that region. ‘Surplus’ is a simplistic calculation as it assumes that the interconnectors play no role.
One slight difference between this map and the one displayed in the ‘Whole of NEM’ tab is that the data for interconnectors is coloured differently. In the Whole of NEM tab, these numbers are coloured red, blue and green while here the data conveyed is the same (and in the same order) but those colours are not present here.
Shorter-Term Regional Trading and History Chart
Next to the map is a zoomed in version of the Regional Trading and History Chart that is shown at the top of the screen. This version of the chart shows 3 hours of history and 1 hour (P5) forecast of 5-minute data:
The P5 forecast shown here is updated every 5 minutes, on a slightly different timing to the publication of actual dispatch prices (hence the overlap shown in the chart). We’ve also included this other tabular view to help you see how these successive forecasts converge on final prices.