GC0166 Grid Code changes
- Publication type:
- Code modification
- Publication date:
- Topic:
- Electricity transmission, Energy codes, National Energy System Operator (NESO)
- Subtopic:
- Grid code
- Industry sector:
- Transmission Network
Outcome of changes to Grid Code GC0166, to add new balancing mechanism parameters to the Grid Code.
Details of outcome
We have decided to approve changes to Grid Code modification GC0166. The change will result in the introduction of new parameters that will allow the better use of electricity storage modules in the balancing mechanism.
Start date
5 November 2025.
Code modification description
GC0166 introduces new parameters, Maximum Delivery Offer (MDO), Maximum Delivery Bid (MDB) and Future State of Energy (FSoE), into the balancing code section of the Grid Code.
GC0166 was raised by the Electricity System Operator (ESO), now known as National Energy System Operator (NESO), on 29 November 2023. The proposal seeks to introduce new parameters that will allow the better use of electricity storage modules within the balancing mechanism, with all balancing mechanism units required to submit the new parameters.