FES: Pathways to Net Zero Building Block Data

The GB FES Building Blocks represent a top-down breakdown of the national level FES pathway results to a smaller Grid Supply Point level which was developed as part of the Energy Networks Association (ENA) Open Networks project. One of the outputs is an agreed set of common building blocks, of which the GB FES values are included here. Common building blocks ensure that the results are published to a consistent template making comparison easier as we can now directly compare like for like components between the outputs from different organisations and from different processes.

These are intended to provide additional clarity for stakeholders on alignment of FES and Regional Distribution Future Energy Scenarios (DFES's) produced by Distribution Network Operators. They are not intended to be used for the creation of regional pathways.

The first RESPs are expected to be published in late 2027. However, to support the upcoming electricity distribution price control (ED3), a transitional RESP output will be consulted on in September 2025 and published in January 2026. The tRESP output will include regional conditions and priorities, identified areas of strategic need, modelled short-term and long-term pathways and consistent planning assumptions. The baseline for the tRESP pathways outputs is a new bottom-up disaggregation of FES 2025 at a very local level which is then reaggregated to Grid Supply Point (GSP) feeding area.

The RESPs will develop bottom-up regional plans at distribution level that span across all energy vectors. NESO will be producing RESPs across the 11 nations and regions defined by Ofgem. These are set out in Ofgem’s RESP Framework Policy decision (April 2025). The RESP boundaries have been developed through consideration of cross-vector planning potential, sufficiency of scale, fullness of Great Britain’s coverage and, critically, being deliverable at pace.