GC0139: Enhanced Planning-Data Exchange to Facilitate Whole System Planning

This modification seeks to increase the scope and detail of planning-data exchange between Network Operators and National Energy System Operator (NESO) to help facilitate the transition to a smart, flexible energy system.

Modification status:
Current - Workgroup Report
Last updated:
03 December 2025

Code Administrator Contact: Jess Rivalland [email protected]

Governance Route: Standard Governance

Impacts:

High impact: National Energy System Operator (NESO), Transmission Owners (TOs) and Network Operators (i.e. Distribution Network Operators and Independent Distribution Network Operators) 

Medium impact:  Power System Analysis Software Vendors  

Low impact: Non-embedded and embedded customers. 

No impact: Generators

Code modification proposed by:
Ian Povey