Skip to main content


Active Network Management

In areas where there are multiple complex constraints affecting a number of customers over a long time period, full active network management systems will be implemented. Distributed control systems continually monitor all the limits on the network and then allocate the maximum amount of capacity to customers in that area, based on the date their connection was accepted. 


To help us improve the quality of supply in isolated rural areas, we are installing control equipment on parts of our 11,000 volt overhead network. These automation and control facilities allow us to restore supply more quickly if there is a permanent fault. 

Customer Interruptions

This is a period of time when a customers power supply has stopped. The customer could be experiencing a power cut during this time. 

Extra High Voltage (EHV)

Operating at more than 22,000 volts but less than 132,000 volts. EHV usually refers to 33,000 volts. 

Grid Supply Point

A substation where voltage is transformed from either 400kV or 275kV to 132kV. The substations and transformers are owned by National Grid Company (NG). National Grid Electricity Distribution (NGED) owns the 132kV circuits emanating from the substation. 

High Voltage (HV)

Operating at greater than 1,000 volts but less than 22,000 volts. This usually refers to 11,000 volts.