SIXEP Continuity Plant (Sellafield)

What has changed on this project, and when

• Stage: In construction (three-quarters complete, August 2026)2 November 2026 · previously: In construction (75% complete, August 2026)
• Value: Not disclosed2 November 2026 · previously: £1.0bn (P50 whole-life cost, published business case, 2020/21 prices)
• Next milestone: Operations due to begin 202924 September 2026 · previously: Commissioning 2029
• Stage: In construction (75% complete, August 2026)24 September 2026 · previously: In construction
• Value: £1.0bn (P50 whole-life cost, published business case, 2020/21 prices)24 September 2026 · previously: Confirm at cycle (business case on gov.uk)

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