This page provides full details of the proposed change, relevant dates and decisions.
What is the issue?
CM Rules prohibit a change in Capacity Market Unit (CMU) configuration after Prequalification. This prevents Agreement holders from changing CMUs to reflect changes in project development and/or commercial structures. This may limit the commercial flexibility of Agreement holders, increasing the risk of project non-delivery, preventing more efficient commercial structures, and ultimately increasing Capacity Market costs.
What is the proposed solution?
Amendment to the CM Rules to allow CMUs to be merged after Prequalification subject to the total Connection Capacity and Generating Technology Class of each component (and therefore De-rated Capacity) being unchanged.
StatusTitle Decoration
With Ofgem phase
This is the stage after consultation and after the CMAG has sent a recommendation to Ofgem but before Ofgem has determined whether to approve/reject/send back a CM Rules change.
Next StepsTitle Decoration
| Milestone | Date |
| Proposal Form Submission | 8 November 2023 |
| CMAG Initial Consideration | Meeting 14 (23 November 2023) |
| CMAG Development | Meeting 15 (13 December 2023) |
| CMAG Recommendation to Ofgem | Meeting 15 (13 December 2023) |
| Ofgem Statutory Consultation | TBC |
| Implementation | TBC |
Impacts and Related ChangesTitle Decoration
Impacts
Capacity Market Rules Sections
- Rule 4.4.4 – Configuration of Generating Units
Impacted Parties
- Capacity Providers
- EMR Delivery Body
- CM Settlement Body
Related Changes
DocumentsTitle Decoration
Contact informationTitle Decoration
Lead Analyst:
Chris Arnold, Senior Change Lead: Capacity Market
[email protected], 020 7380 4221