What is transmission queue management? Including a milestones calculator
To support clients and the industry as a whole, Roadnight Taylor has developed a simple Milestone Calculator for transmission queue management. This free to download tool offers a view of milestone dates ahead of any Modification Application Offer or Construction Agreement Offer associated with a new application.
Article by Kyle Murchie – expert grid connections engineer
Before joining Roadnight Taylor, Kyle led grid engineering teams and influential roles at SSEN Transmission, SSE Thermal, Electricity North West, UK Power Networks and TNEI Services. Kyle has headed engineering development of projects individually expected to represent investments of up to £1 billion, while leading the grid aspects of projects up to the value of circa £400m through delivery and commissioning.
First written: 11 January, 2024. Calculator last updated: 05 August, 2026
On 13 November 2023, Ofgem approved code modification proposal CMP376, which introduces a Queue Management process into the Connection and Use of System Code (CUSC). This applies a similar concept to the one introduced for distribution-connecting parties in 2018, though there are notable differences in definition, management approach, and the implications of a missed milestone date.
Following approval of CMP376 (and specifically Workgroup Alternative CUSC Modification 7), Queue Management applies to new and existing Construction Agreements, with associated termination powers held by the National Energy System Operator (NESO) where a project fails to meet its set milestones.
Legal implementation
Changes to the legal text within the CUSC (Section 16 and Schedule 2, Exhibit 3 and 3A) took effect on 27 November 2023. From this date, all new Construction Agreement Offers or Modification Application Offers include a new Appendix Q setting out User Progression Milestones.
Further guidance
NESO has published a guidance document and workshop series on the process; see NESO’s Queue Management guide for details.
Milestone calculator
Roadnight Taylor maintains a milestone calculator that visualises milestone dates ahead of a Modification Application Offer or Construction Agreement Offer.
The tool is intended to support understanding only and is not intended to inform commercial decisions.
Last updated: 05 August, 2026
Roadnight Taylor provide the information contained within this document for reference purposes only.
Roadnight Taylor are not responsible for its accuracy or end use. No liability is accepted by Roadnight Taylor for any loss, damage, expenses, charges or costs arising as a result of any decision, action or inaction of the applicable party or any other missed opportunities whatsoever arising from this Transmission Queue Management Tool, its content, use or interpretation.
