The connection between the Transmission and Distribution Systems is known as a Grid Supply Point (GSP). For this reason, each Distribution System is referred to as a GSP Group. 

BSC defined definition

A distinct electrical system, consisting of:

• (i) The Distribution System(s) which are connected to the Transmission System at (and only at) Grid Supply Point(s) which fall within one Group of GSPs, and
• (ii) any Distribution System which:
  1. (1) is connected to a Distribution System in paragraph (i), or to any other Distribution System under this paragraph (ii)
  2. (2) is not connected to the Transmission System at any Grid Supply Point

and the total supply into which is determined by metering for each half hour.

BSC documentation

• BSC Section X, Annex X-1

Related terms 

• Grid Supply Point
• Group of GSPs
• GSP Group Metered Volume
• GSP Group Profile Class Average EAC
• GSP Group Take