Within ez2view we employ various mechanisms to draw your attention to what’s most important in a large (and frequently changing) set of data.
Some of these methods are described here:
With the widgets we develop for ez2view, we will generally take the approach of stripping colour out of the data, and utilising colour to denote significance.
A1. Colouring based on % change
This generally takes several forms:
|Red||If the data highlighted has changed by more than 15% (up or down) from one dispatch interval to the next.|
|Orange||Change was between 10% and 15%.|
|Yellow||Change was greater than 5%, but lower than 10%|
There is sometimes a tolerance added to values of low absolute magnitude, to reduce the amount of “noise” in the display.
This approach is used in many of our widgets, with some key examples being:
- the Region Schematic widgets (to highlight changes in station output, for instance), and
- in the Current Bids widget (to highlight significant changes in bids).
A2. Other exception-based colour-coding
There are a number of other occasions where we use colour-coding based on thresholds being reached.
For instance in the “Dispatch Constraints” Widget, we list all of the constraints currently involved in the current dispatch interval, and sort by significance – then highlighting on those that are bound with the following colours:
|Red||Marginal Value ≥ 10 (in absolute terms) in a constraint that is bound.|
|Yellow||A constraint is bound, but the absolute value of Marginal Value < 10.|
A3. Colour Thermalling, or step changes
Sometimes it is desirable to highlight where values are in a range, so we use a thermalling approach – such as when presenting a trend of generator bidding behaviour over time. Our default colour scaling uses three main colours (red, green and blue) for bids made in the following range:
|Shades of red||Volume offered above $300/MWh – up to the Market Price Cap|
|Shades of green||Bids offered between $0/MWh and $300/MWh – which generally reflects some form of Short-Run Marginal Cost or Long-Run Marginal Cost|
|Shades of blue||Volume offered at or below $0/MWh – down to the Market Price Floor.|
But note that you, as a user, are able to define and use your own colour coded bid buckets across most of the application.
On other occasions, where it is important to see progressive changes in data we use a continuous graduation in the colour scale.
An example of this is in the Forecast Convergence widget, shown in the sample image below:
In cases like this, a continuous graduation in the colour scale enables the user to see both the absolute value of the data, and also relative significance of changes.
Coupled with use of colour throughout the ez2view product, we have also incorporated a number of other alerting mechanisms – such as the following:
B1. Visual Alerts (in addition to colours, above)
Additional visual alerts are used in the application.
Meaning of the icon
|Where a DUID, or Interconnector, is subject to a bound constraint in the displayed dispatch interval, an icon is displayed to indicate this (e.g. in the relevant Region Schematic):|
|Where the entity is on the Left-Hand Side of a bound constraint with a positive factor, a “plus” sign is used.
If the constraint is of the form LHS ≤ RHS (which is typical, except for FCAS constraints) this can be read as the constraint trying to reduce the DUID or positive flow.
|Where the entity is on the LHS of a bound constraint with a negative factor, then a “minus” sign is shown.
If the constraint is of the form LHS ≤ RHS (which is typical, except for FCAS constraints) this can be read as the constraint trying to increase the DUID or positive flow.
|This icon is shown for a particular station or DUID where there has been a change in bid from the prior dispatch interval to the current one.
· Might be to do with shifting volume at certain price bands (which might have been scheduled earlier, or the result of a rebid), or
· Might be to do with other technical parameters in the bid (such as Ramp Rates)
|Where AEMO’s Price Setter data is illustrated, two different icons are used:|
|Indicates that the band is a Marginal Price Band.
This band was dispatched pro-rata of its band size relative to other marginal bands affecting this market region (potentially corrected for inter-regional losses).
|Indicates that the band is a Non-Marginal Price-Tied Price Band.
This energy band belongs to a unit that was inflexibly dispatched. It had the same price as other marginal energy bands, resulting in a tie-breaking cost penalty due to violation of the proportional dispatch sharing arrangement.
B2. Notification Stream
In the installed ez2view software, users have the ability to configure their own alerts in relation to aspects of the market of particular interest to them.
These alerts will be checked by your copy of ez2view if you have a Notification Stream widget open in a window operating in Real Time mode (if you don’t have the widget open in real time, new data won’t be checked).
Your Notification Stream widget will continue to add a log of alerts triggered, as ez2view steps through a given day:
Functionality is limited in the Silver Model.
B3. SMS Alerts
There is an SMS alert functionality for ez2view. This is currently being reconfigured for ease of access.