Aditi Tulpule

This Practice Note provides a detailed overview of the key participants in the Great Britain (GB) electricity market. The Practice Note covers the principal organisations/types of organisation involved in the generation, transmission, international interconnection, distribution, and supply of electricity (electricity wholesale market, electricity retail market, and electricity networks market) in GB. It also provides details of those who regulate and administer the main controls, industry codes, support mechanism and policies seen in the GB electricity market.

This Practice Note summarises the various roles—both historic and present—of National Grid and National Grid-owned bodies in the Great Britain (GB) energy market. It includes discussion of National Grid Electricity Transmission plc, National Grid Electricity Distribution plc, National Gas Transmission plc (NGT), as well as National Grid’s former role as the Electricity Market Reform (EMR) Delivery Body. It also covers the former distinction between National Grid’s electricity transmission owner and electricity system operator roles and the split of these TO and SO roles between NGET. Finally, the Practice Note considers the impact of the recently established National Energy System Operator (NESO) on National Grid and its functions in the GB energy system.