You can raise a modification – or mod – when you want to propose a change to any part of the CUSC.

For more information, please contact [email protected]

Search for any current or concluded modifications by name or ID. You can sort mods by ID, name, status or date of update.

Views reference
Modification status
ID Name Status Last Updated Sort ascending
CMP428 CMP428: User Commitment liabilities for Onshore Transmission (reinforcement) in the Holistic Network Design Current
CMP430 CMP430: Adjustments to TNUoS Charging from 2025 to support the Market Wide Half Hourly Settlement (MHHS) Programme Current
CMP435 Application of Gate 2 Criteria to existing contracted background CMP435 Application of Gate 2 Criteria to existing contracted background Current
CMP434 Implementing Connections Reform CMP434 Implementing Connections Reform Current
CMP316 CMP316: TNUoS Arrangements for Co-located Generation Sites Current
CMP433 CMP433: Optimised Transmission Investment Cost model Current
CMP418 CMP418: Refine the allocation of Dynamic Reactive Compensation Equipment (DRCE) costs at OFTO transfer Current
CMP413 CMP413: Rolling 10-year wider TNUoS generation tariffs Current
CMP424 CMP424: Amendments to Scaling Factors used for Year Round TNUoS Charges Current
CMP432 CMP432: Improve “Locational Onshore Security Factor” for TNUoS Wider Tariffs Current

More about modifications

Modification Tracker

Our Tracker gives you the latest details on current code modifications including the purpose and the stakeholders it affects, as well as panel comments and where it is in the review process. It is published on the 7th (or next working day) of each month.

Modification Proposal Form

If you're thinking about raising a modification, please get in touch with us. Our experts can give you advice on your Proposal, explain how the modification process works and help to answer any questions you may have. When we receive your Proposal, we'll check it through and work together to make sure it's easy to understand.


Once you've been in touch and are ready to write your Proposal paper, send it to us by the monthly modification submission date which you can find on our Calendar.