Grid infrastructure βΊ Connection queue βΊ Interconnector
INTERCONNECTOR Β· NGETSeneca
Seneca is a 1.3 GW interconnector project in planning, connecting to the National Grid (England & Wales) network at Mablethorpe 400kV Substation, with capacity due from November 2031. The connection agreement is held by Frontier Power International Limited.
- Planning (current stage)
- Consented (not yet reached)
- Construction (not yet reached)
- OperatingFrom Nov 2031 (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-000981
- Customer
- Frontier Power International Limited
- Technology
- Interconnector
- Export capacity
- 1.3 GW
- Import capacity
- 1.2 GW
- Change in this agreement
- +1.3 GW
- Capacity effective from
- 30 November 2031
- Connection site
- Mablethorpe 400kV Substation
- Transmission owner
- National Grid (England & Wales)
- Connection type
- Interconnector
- NESO project status
- Scoping
- Connections reform gate
- Gate 1
Connection site
The marker shows the place the connection site is named after, not the project itself, with the transmission network around it.
Other projects at Mablethorpe 400kV Substation
Source: NESO interconnector register, downloaded 8 November 2026. Contains data from NESO, licensed under the NESO Open Data Licence. Report a problem