High Marnham 400MW Field BESS

High Marnham 400MW Field BESS is a 400 MW battery storage project in planning, connecting to the National Grid (England & Wales) network at Trent Valley South Connection Node G 400kV Substation, with capacity due from October 2039. The connection agreement is held by Field High Marnham Ltd.

Project stageIn planning

Planning (current stage)
Consented (not yet reached)
Construction (not yet reached)
OperatingFrom Oct 2039 (not yet reached)
Closed (not yet reached)

Scoping and awaiting consents are both shown as planning. A connection agreement does not mean the project will be built: many queue projects never reach construction.

Connection details

NESO project number: PRO-005938
Customer: Field High Marnham Ltd
Technology: Energy Storage System
Total capacity: 400 MW
Change in this agreement: +400 MW
Capacity effective from: 30 October 2039
Connection site: Trent Valley South Connection Node G 400kV Substation
Transmission owner: National Grid (England & Wales)
Connection type: Direct connection to the transmission network
NESO project status: Scoping
Connections reform gate: Gate 1

Connection site

This project connects at a new substation (a “connection node”) that has not been built or located yet.

Projects connecting near Trent Valley South Connection Node G · Grid map

Source: NESO Transmission Entry Capacity (TEC) register, downloaded 8 November 2026. Contains data from NESO, licensed under the NESO Open Data Licence. Report a problem