Charts

The following chart types are used in EMarketOffer:

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

The Supply Curve Graph

Access

The Supply Curve option is under the Supply and Demand item on the Edit 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

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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 Edit 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