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BATTERY STORAGE · SPTMotherwell 400MW BESS (Formerly Castlehill BESS)
Motherwell 400MW BESS (Formerly Castlehill BESS) is a 400 MW battery storage project in planning, connecting to the SP Transmission (south Scotland) network at Newarthill 275 kV Substation, with capacity due from April 2035. The connection agreement is held by SPV GPC 3 Ltd.
- Planning (current stage)
- Consented (not yet reached)
- Construction (not yet reached)
- OperatingFrom Apr 2035 (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-003500
- Customer
- SPV GPC 3 Ltd
- Technology
- Demand, Energy Storage System
- Total capacity
- 400 MW
- Change in this agreement
- +400 MW
- Capacity effective from
- 30 April 2035
- Connection site
- Newarthill 275 kV Substation
- Transmission owner
- SP Transmission (south Scotland)
- Connection type
- Direct connection to the transmission network
- NESO project status
- Scoping
Connection site
The marker shows the connection substation, not the project itself, with the transmission network around it.
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