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HYDRO AND PUMPED STORAGE · SPTCruachan U3&4 Replacement
Cruachan U3&4 Replacement is a 480 MW hydro and pumped storage project consented, connecting to the SP Transmission (south Scotland) network at Cruachan 275kV Substation, with capacity due from April 2029. The connection agreement is held by Drax Pumped Storage Limited.
Project stageConsented
- Planning (completed)
- Consented (current stage)
- Construction (not yet reached)
- OperatingFrom Apr 2029 (not yet reached)
- Closed (not yet reached)
Connection details
- NESO project number
- PRO-000113-2
- Customer
- Drax Pumped Storage Limited
- Technology
- Pump Storage
- Total capacity
- 480 MW
- Change in this agreement
- +40 MW
- Capacity effective from
- 4 April 2029
- Connection site
- Cruachan 275kV Substation
- Transmission owner
- SP Transmission (south Scotland)
- Connection type
- Direct connection to the transmission network
- NESO project status
- Consents Approved
- 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 Cruachan 275kV 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