95.Under the electricity market arrangements in Great Britain (the British Electricity Transmission and Trading Arrangements) generation companies are entitled to operate power stations without taking into account network limitations. This would not be an issue if the existing transmission network had sufficient capacity to send the required electricity to and from all parts of Great Britain but, in some areas, the existing capacity of the wires does not always allow this. Such scenarios are called transmission-related ‘constraints’ and require action to be taken by the system operator(12), National Grid, to ensure that supply and demand is balanced on both sides of this constraint.
The system operator is responsible for the operation of the national electricity transmission system.
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