CMP474 Connection and Use of System Code (CUSC) urgency decision
- Publication type:
- Code modification
- Publication date:
- Topic:
- Energy codes,
- Electricity transmission
- Subtopic:
- Connection and use of system code (CUSC)
Outcome of request for an urgent review of proposed changes to Connection and Use of System Code CMP474, Fixed BSUoS Price reset mechanism.
Details of outcome
On 14 April 2026, the National Energy System Operator (NESO) raised the Connection and Use of System Code CUSC Modification Proposal CMP474: ‘Fixed BSUoS Price reset mechanism’.
On 21 April 2026, the CUSC Panel wrote to inform us of its unanimous view that CMP474 should proceed as an Urgent CUSC Modification Proposal.
We have decided to accept the request for urgency for CMP474. This letter sets out our reasoning.
Code modification description
This proposal concerns change to the Balancing Services Use of System (BSUoS) tariff reset process within the Connection and Use of System Code. BSUoS charges are used to recover the costs incurred by the National Energy System Operator in balancing the electricity system and are currently set as fixed tariffs over defined periods.
CMP474 seeks, in response to perceived increased volatility in balancing costs, to introduce a resetting of the fixed BSUoS price.