This report has been compiled to provide stakeholders with an overview of the transmission development programme as at the end of calendar year 2022, and highlight how each of the six steps works, by reference to 2022 projects.

This report forms the basis of the 2025 firm access review.

The System Margins Outlook Report will be published every Monday and Friday, excluding bank holidays. The report will provide market participants with information on the anticipated availability of dispatchable generation capacity to meet peak demand each day over the week ahead; the average and lower confidence renewables forecast; and the availability of the East-West Interconnector and the Moyle Interconnector with Great Britain to support trades - should these be required to meet power system requirements when renewable and dispatchable generation are inadequate.