Charts

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The following chart types are used in EMarketOffer:

  • Supply Curve Graph
  • Offer Graphs
  • Demand Histograms
  • General Purpose Charts

Contents

The Supply Curve Graph

Access

The Supply Curve option is under the Supply and Demand item on the Data Menu of the Main Window and is available for all Data Source types.

Purpose

The Supply Curve Graph displays the Offer Stack for the Current Data Set (excluding the Powerflow Case Data Source). The Graph appears in its own window and is updated whenever the Current Data Set changes.

Features

Feature Purpose
Title Bar
Shows Current Data Source and Current Period displayed in the graph
Price Axis
Non-Linear scale of Offer price
Quantity Axis
Represents total offered quantity (MW) in the Current Period
Demand Line
System Demand for the Current Period
Supply Curve
A line joining the price points in the Supply stack
Supply Roll Over
A mouse-activated feature that shows details about the Unit offering capacity at that (vertical) point on the Supply Curve.

NOTE: It should NOT be assumed that a Unit belongs to a marginal Generation Station if an offer band is not fully dispatched

Dispatched Shading
Provides a vertical shaded band at right angles to the Supply Curve at every point along where quantity offered was actually dispatched. This means that:
  • Generation that was expected to be dispatched based on price but was not, shows as vertical white bands to the left of the Demand Line
  • Generation that was not expected to be dispatched on price but was, shows as vertical green bands to the right of the Demand Line
Options Link
Open the Supply Curve Options Window to customise the appearance of the Supply Curve Graph

NOTE: The Supply Curve Graph Window is sizeable. The chart area expands and compresses to fill the available space.

The Supply Curve Options Window

Access

The Options Link on the Supply Curve Graph.

Purpose

To customise the appearance of the Supply Curve Graph

Feature Purpose
Supply Colour
Uses the Windows Colour Picker to select a colour for the Supply Curve line
Demand Colour
To select a colour for the Demand line
Generation Colour
To select a colour for the Generation
Show Generation Fill
On/Off Toggle for the display of the dispatched generation shading

The Offers Graph

Access

The Offers Graph Option' under the Supply and Demand item on the Data Menu of the Main Window and is available for the Forecast and Market (when available) Data Source types.

Purpose

To display Offers data by Generation Station or by Price, using configurable colour coding to identify Price bands and Generation Stations.

Graph Display Types

Graph Display Default Date Range Access
A selected date range in a Market Data Source
Current day
Periods 1 to 48
Main Window Menu Bar
Edit > Supply and Demand > Offers Graph
A selected date range in a Forecast Data Source
Current day
Periods 1 (or first forecast period if > 1) to 48 (or last forecast period if < 48)
Main Window Menu Bar
Edit > Supply and Demand > Offers Graph
A selected day (or days) in a weekly Offer profile in a Forecast Definition
Current day
Periods 1 to 48
Forecast Definition Window
Edit > Offers Graph

Features

Feature Purpose
Title Bar
Displays the Chart's Data Source
Menu Bar
Provides access to the chart's functions
Date Range Picker
Sets the date range displayed in the chart
Chart Area
  • Displays Offers as a shaded column for each Trading Period coloured by user-defined Offer Price bands
  • Graphs system Demand as a single line

NOTE: The Offers Graph Window is sizable. The chart area expands and compresses to fill the available space.

Offers Graph Concepts

Display Modes

The Chart Area has two modes of display:

  1. Offers by Price: which segments the entire Offer stack into user-defined Price bands by Trading Period
  2. Offers by Generation Station: which segments the entire Offer stack by individual Generation Unit by Trading Period

Display Elements

The following elements appear in the Chart Area display:

Element Purpose
Quantity Axis
Measures total offered quantity in MW
Time Axis
Demarcates the Chart date range using Date and Period markers
Graph Area
A continuous area of single colour on the Chart indicating either:
  • a band of offered quantity falling within a user-defined price range (Offers by Price); or
  • a band of quantity offered by a single Generation Unit (Offers by Generator)
Guideline
A line of user-defined colour joining the points across all displayed periods above which Offer Price exceeds the Price associated with the line
Load Line
A dark grey line joining the points of system Demand across all displayed Periods
Load Region
Area under the Load Line (can be shaded with semi-transparent pale grey)
Chart Rollover
A mouse-activated feature causing a roll-over panel to appear containing information associated with the underlying graph point
Legend
Displays the colours used in the chart

The Offers Graph allows you to customise the following display items:

Item Editor
Price Band Value and Colour
Change Graph Colour Window through the Price Colouring option from the Colouring Menu
Displayed Generation Stations
Change Graph Colour Window though the Generation Colouring option from the Colouring Menu
Guideline value and colour
Change Graph Colour Window though the Guideline Colouring option from the Colouring Menu
Load Line, Load Zone and Guideline visibility
Options Menu
Displayed Company and its colour
The Company Colouring Window though the Company Colouring option from the Colouring Menu

The Change Graph Colour Window

Access

The Colouring Option on the Offers Graph Window.

Purpose

Sets the colour options for:

  • Offers between user-defined Price Bands
  • Generation Station Offers
  • Generation Offered Quantity Guidelines

The Change Graph Colour Window can be opened for three different colouring options:

  • Price Colouring
  • Generation Colouring
  • Guide Line Colouring

Elements

Element Purpose
Value Column
Allows you to enter:
  • Numeric values for Price bands and Guidelines
  • Generation Station names
Colour Column
Shows the currently selected colour for the associated value. Rolling over a colour field with the mouse causes a grey box to appear on the right hand side of the field - clicking this box opens the standard Windows Colour Picking Window.

Usage

>> To make a colour selection:

  1. Click in a Colour Selection Field causing the Colour Picker Button to appear in the right side of the field
  2. Click the Colour Picker Button to open the standard Windows Colour Picker
  3. Use the Picker to select a colour and click OK

The Company Colouring Window

Access

The Colouring Option on the Offers Graph Window.

Purpose

Collects all offered quantity from all Generation Stations owned by a singe company and display it in the Offers Graph under a single colour (Graph by Generation Option only).

Elements

Element Purpose
Name Field
A drop down box to select a specific Company to colour in the Graph
Colour Picker
Shows the current colour selected for the Company. Clicking on the adjacent grey box causes the Standard Windows Colour Picking Window to open so you can select another colour
OK Button
Closes the Window and implements your Company selection
Cancel Button
Closes the window and discards your Company selection

Usage

When using the Colour Company option the following points should be noted:

  1. All generation offered by Stations owned by the Company will appear in the same colour
  2. You can only select one Company at a time. This is because Companies are defined globally and it is possible to define multiple companies such that any one Station may be owned by more than one Company (preventing all companies appearing on the same graph together)
  3. Currently selected Stations not owned by the Company will also appear in the chart (so it is important to ensure you choose a colour for a Company that is not used by any other Company's stations)
  4. The Company Colour change is permanent; any previous colour association for a Station is lost. In other words: in order to see offered generation for a specific Station distinct from any of the Company's other Stations (after you have coloured Stations by Company) you will need to change the colour of that Station using the Generation Colouring option.

The Offers Graph Menu Bar

Options

Menu Feature Purpose
Graph
By Price
Causes the Chart Area to display Offers data according to price
By Generation
Causes the Chart Area to display Offers data by Generation Station
Options
Load Line
Toggles the load line display on and off

NOTE: When the Load line display is off Load shading is also disabled

Load Shading
Toggles the Load Shading display on and off
Guidelines
Toggles the Guidelines display on and off
Print (press CTRL and P together)
Allows the currently displayed Chart area to be printed using the standard Windows Print Dialogue Box to select a printer.
Colouring
Price Colouring
Opens the Change Graph Colours Window to customise Price band limits and colours
Generation Clothing
Opens the Change Graph Colours Window to customise Generation Station colour bands
Guide Line Colouring
Opens the Change graph Colours Window to customise the number and colour of on-chart guidelines
Company Colouring
Opens the Company Colouring Window

The Offers Chart Date Range Picker

Selects the number of days displayed in the Offers Chart Area.

Date Range Picker
Start Date Selector
Sets the start date in the underlying Data Source' for which Offers will be displayed
Number of Days Selector
Sets the number of consecutive days Offers will be displayed (starting at the start date).

Configuring the Offers Graph

>> To configure the Offers Graph to display the Offer stack by Price:

  1. Open the Offers graph Window
  2. Select the By Price option from the Graph Menu on the Menu Bar (the Chart opens in Price view by default)
  3. Use the Start Date and Number of Days Selectors to define a date range for the Chart
  4. Select the desired Load Line parameters using the Load Line and Load Sharing Options from the Options Menu in the Menu Bar
  5. Choose the Price bands you want to display using the Price Colouring Option from the Colouring Menu in the Menu Bar
  6. Toggle on/off for the Guidelines display using the Guidelines Options from the Options Menu in the Menu Bar
  7. Choose the Guidelines you want to display using the Guide Line Colouring Option from the Colouring Menu in the Menu Bar.

>> To configure the Offers Graph to display the Offer stack by Generator:

  1. Repeat the steps as for Price but instead of choosing Price Bands select the By Generation option from the Graph Menu on the Menu Bar (the Chart opens in Price view by default)

Setting an Individual Price Band

You can chose the price bands you want to see on a chart and select the colours to represent them using the Change Graph Colours Window. As an example if you set a value of 50 with red and 100 with yellow, all quantity offered between $50 and $100 would appear as a red band.

>> To set a new Price band:

  1. Select the Price Colouring Option from the Colouring Menu
  2. Enter an upper Price boundary in the Value field of the empty row at the foot of the Data Grid
  3. Select the band colour by clicking in the adjacent Colour field to open the standard Windows Colour picker

>> To delete a previously defined band:

  1. Click on the Value field in the row containing the unwanted band
  2. Press the <Delete> key

Setting an Individual Generator Band

>> To set a new Generator band:

  1. Select the Guidelines Colouring Option from the Colouring Menu
  2. Enter a Generation Station name in the Value field of the empty row at the foot of the Data Grid
  3. Select the band colour by clicking in the adjacent Colour field to open the standard Windows Colour picker

NOTE: The colour selected for a Generator will apply to all Units belonging to that Generator

Setting an Individual Guideline

>> To set a new Generator band:

  1. Select the Guidelines Colouring Option from the Colouring Menu
  2. Enter a Guideline alue in the Value field of the empty row at the foot of the Data Grid
  3. Select the band colour by clicking in the adjacent Colour field to open the standard Windows Colour picker

The General Purpose Chart

Access

The Reports and Graphs option in the Data Menu

Purpose

To Chart a single trait from multiple instances of a single Modelled Item.


NOTE: It is NOT possible to mix attributes (e.g. Load and Price for a Node) in one chart, or to mix Modeled Items (e.g. Generation for a Unit and a Node).

Features

Feature Purpose
Title Bar
Shows the Modeled Item and Trait being charted
Attribute Axis
Provides a scale for measuring the selected Modeled Item Trait (in this example Load is measured in MW)
Time Axis
Constant in all Charts displayed as Date and Time
Chart Area
Contains the selected Trait value lines against a faint grid
Legend
Shows the Trait colour allocation

Usage

Unlike other charts the General Purpose Chart can be sized and scrolled. The key sequences used to navigate the Chart are:

Key(s) Result
<Left Arrow>
Scrolls the display to the left (i.e moves the display forwards in time)
<Right Arrow>
Scrolls display to the right (i.e. moves the display backwards in time)
<Up Arrow>
Scrolls display up
<Down Arrow>
Scrolls display down
<Ctrl><Left Arrow>
Compresses display vertically around the chart centre (i.e. allows more of the past and future to be visible)
<Ctrl><Right Arrow>
Expands display vertically around the chart centre (i.e. decreases the visible date range)
<Ctrl><Up Arrow>
Compresses the displayed chart horizontally around the chart centre
<Ctrl><Down Arrow>
Expands display vertically around the chart centre

The chart can also be dragged around within the Display Area using the mouse (point, click and drag).

Finally the Chart also supports the Stretchtangle feature found on Maps to expand selected areas of the Chart.


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