Grid infrastructure › Connection queue › Battery storage
BATTERY STORAGE · SPTHigh Mathernock Battery Storage
High Mathernock Battery Storage is a 334 MW battery storage project in planning, connecting to the SP Transmission (south Scotland) network at High Mathernock 132Kv Substation, with capacity due from October 2029. The connection agreement is held by Harmony HM Limited.
Project stageIn planning
- Planning (current stage)
- Consented (not yet reached)
- Construction (not yet reached)
- OperatingFrom Oct 2029 (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-002273
- Customer
- Harmony HM Limited
- Technology
- Energy Storage System
- Total capacity
- 334 MW
- Change in this agreement
- +334 MW
- Capacity effective from
- 17 October 2029
- Connection site
- High Mathernock 132Kv Substation
- Transmission owner
- SP Transmission (south Scotland)
- Connection type
- Direct connection to the transmission network
- NESO project status
- Scoping
- Connections reform gate
- Gate 1
Connection site
The connection site could not be placed on the 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