CMP446 Explained

CMP446 raises the TIA threshold from 1MW to 5MW in England and Wales, streamlining grid connections for sub-5MW distributed generation projects. By removing unnecessary transmission impact assessments, CMP446 reduces delays, lowers costs, and creates faster routes to market for developers. But what does this mean for projects already in the pipeline and how will it affect larger schemes? Here’s what developers need to know.

March 3, 2026