Sizewell 400kV Substation

Sizewell 400kV Substation (NGET) has 2 projects in NESO's TEC Register of 23 Oct 2026: 3,340 MW in the queue, and 1,230 MW connected. Contracted capacity, not headroom.

Transmission owner: NGET
Projects: 2
MW in the queue: 3,340 MW
MW connected: 1,230 MW

By technology

Technology	Projects	MW
Nuclear	2	4,570

Projects at Sizewell 400kV Substation

Project	Technology	MW	Gate	Status	MW effective from
Sizewell C	Nuclear	1,670–3,340		Consents Approved	31 Jul 2035, 31 Jul 2036
Sizewell B	Nuclear	1,230		Built

Source

NESO TEC Register, National Energy System Operator, publication of 23 Oct 2026. NESO Open Data Licence.