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BATTERY STORAGE · SPTEccles BESS
Eccles BESS is a 500 MW battery storage project under construction or commissioning, connecting to the SP Transmission (south Scotland) network at Eccles 400kV Substation, with capacity due from April 2026. The connection agreement is held by Eccles Energy Centre Limited.
Project stageUnder construction
- Planning (completed)
- Consented (completed)
- Construction (current stage)
- OperatingFrom Apr 2026 (not yet reached)
- Closed (not yet reached)
Connection details
- NESO project number
- PRO-001470
- Customer
- Eccles Energy Centre Limited
- Technology
- Energy Storage System
- Total capacity
- 500 MW
- Change in this agreement
- +500 MW
- Capacity effective from
- 12 April 2026
- Connection site
- Eccles 400kV Substation
- Transmission owner
- SP Transmission (south Scotland)
- Connection type
- Direct connection to the transmission network
- NESO project status
- Under Construction/Commissioning
- Connections reform gate
- Gate 2
Connection site
The marker shows the connection substation, not the project itself, with the transmission network around it.
Other projects at Eccles 400kV Substation
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