Glossary

Attribute

A single data item describing a Modelled Item (e.g. Price at a Node for a single Trading Period)

Circuit

A link, either a line or a transformer, with electrical characteristics such as Resistance and Reactance and which is capable of carrying a Powerflow on the Transmission System.

COMIT

Commodity Market Information and Trading System: an electronic trading and information system operated by MCo.

Constraint

A constraint occurs when one or more Circuits reaches its local maximum carrying capacity set by the System Operator to maintain grid security or power quality.

Current Data Set

The set of data currently being displayed in the Presentation Interface. Most of the Presentation Interface functions are concerned with viewing or manipulating the