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
CMP427 CMP427: Update to the Transmission Connection Application Process for Onshore Applicants Implemented
CMP411 CMP411: Introduction of Anticipatory Investment (AI) within the Section 14 charging methodologies Current
CMP424 CMP424: Amendments to Scaling Factors used for Year Round TNUoS Charges Current
CMP403 and CMP404 CMP403 and CMP404: Introducing Competitively Appointed Transmission Owners & Transmission Service Providers (Section 14 and 11) Current
CMP287 CMP287 Improving TNUoS Predictability Through Increased Notice of Inputs Used in the TNUoS Tariff Setting Process Withdrawn
CMP428 CMP428: User Commitment liabilities for Onshore Transmission circuits in the Holistic Network Design Current
CMP316 CMP316: TNUoS Arrangements for Co-located Generation Sites Current
CMP431 CMP431:Adjustments to TNUoS Charging from 2025 to support the Market Half Hourly Settlement (MHHS) Programme (Non-Charging) Current
CMP430 CMP430: Adjustments to TNUoS Charging from 2025 to support the Market Wide Half Hourly Settlement (MHHS) Programme Current
CMP288&CMP289 CMP288&CMP289: Explicit charging arrangements for customer delays and backfeeds (CMP288) and consequential change (CMP289) 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.

Calendar

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.