We are a separate company

On 1 April the Electricity System Operator became a legally separate company within the National Grid Group. Find out more about what this change means.

Electrical standards documents including specifications for electronic data communications facilities

Here you will find the electrical standards documents that apply to transmission-connected generators in England, Wales, and Scotland. Please use the table below to see which standards apply to your connection.

  RES SPT SHE Transmission EDL/EDT Control Telephony
Directly connected in England & Wales    
Directly connected in SPT’s area    
Directly connected in SHE Transmission’s area    
Embedded BM Participant      

RES = Relevant Electrical Standards
SPT = Scottish Power Transmission
SHE = Scottish Hydro Electric Transmission   
EDL = Electronic Dispatch Logging
EDT = Electronic Data Transfer

RES guidance document