Current state
| Status | Under construction |
| Design | EPR (PWR) |
| Net capacity | 1,630 MWe |
| Country | United Kingdom |
| Vendor | EDF/Framatome |
| Owner / operator | Sizewell C Ltd (UK Govt/EDF/investors) |
| Construction start | 2025 |
| Original COD target | 2035 |
| Current COD estimate | 2035 |
| Schedule slippage | 0 years |
Notes
Replicate-and-learn thesis vs Hinkley. £38bn (2024 prices); commercial operation guided mid-to-late 2030s — 2035 estimate is the optimistic end. Aug 2026 road-contractor change flagged as a schedule risk by local press; Sizewell C denies delay.
Milestone log
- 2025-07-22 — UK final investment decision; ~£38bn project cost announced (source)
- 2025-11-15 — Financial close reached with private investors (source)
- 2026-02-01 — ~2,000 workers on site as construction ramps (source)
- 2026-08-26 — Sizewell C ends commercial talks with Galliford Try for the Link Road and Two Village Bypass; project says no schedule impact, but local press flags delay risk to the £38bn build (source)
- 2026-09-09 — First commercial freight train arrives via the Green Rail Route (1,000+ t aggregates); ~100 kt by rail before Christmas, up to 4 trains/day at peak (Sizewell C + BBC + NCE) (source)
The milestone log is append-only: corrections are recorded as new entries, never rewrites. Full history via /api/v1/changes.