SIXEP CONTINUITY PLANT

Rating: Compared to financial year 24/25 Q4, the NISTA/SRO Delivery Confidence Assessment (DCA) rating at 25/26 Q4 remained at GREEN. This is primarily due to the following factors: The Project is currently in the execution stage, being delivered by the Programme and Project Partnership (PPP,) and is showing no significant threat to the overall P80 schedule which was also supported by the annual NISTA Gate 0 review undertaken in July 2025 which gave a GREEN Delivery Confidence Assessment, noting that delivery of the project “within the P80 schedule was assessed as highly likely."

Schedule: Compared to financial year 24/25-Q4, the project's end-date at 25/26-Q4 has increased from 23-Jan-2031 to 21-Oct-2031. This is primarily due to the following factor: Change in legislation relating to Passive Fire Protection Standards; the new requirements are more onerous than the original design specification. Due to the required design updates a number of critical path scope packages have been impacted and subsequently the project completion date has been delayed, which remains within the P80 schedule.

Cost: The increase to the project's departmentally agreed Whole Life Cost at 25/26-Q4 is primarily due to: Annual Indexation, in line with the agreed indices, and the impact of the agreed contractual adjustment event for Passive Fire Protection legislative change.

Source: NISTA Major Projects Annual Report 2025-26 (data)

Rating: Compared to financial year 23/24-Q4, the Infrastructure Project Authority's Delivery Confidence Assessment rating at 24/25-Q4 remained at GREEN. This is primarily due to the following factors‚ This is a complex nuclear project on an operational nuclear site. The Project is in the execution stage and continues to transition from bulk civil construction to mechanical and electrical fit out and is currently showing no significant threat to the overall P80 schedule. The SCP project is being delivered by the Programme and Project Partnership (PPP). The IPA afforded this project a RAG rating of GREEN.

Schedule: Compared to financial year 23/24-Q4, the project's end-date at 24/25-Q4 remained at 23/01/2031. This is primarily due to the following factors‚ The Project remains on schedule and there is no change to the date of 23/01/2031.

Cost: Compared to financial year 23/24-Q4, the project's departmentally agreed Whole Life Cost at 24/25-Q4 (measured in £m) increased from 1076 to 1092. This is primarily due to the following factors‚ Compared to 23/24-Q4, the SCP budgeted cost (baseline) has increased by £16m, this is due to escalation in line with the agreed indices.

Source: NISTA Annual Report 2024-25 (data)

Rating: Compared to financial year 22/23-Q4, the Delivery Confidence Assessment rating at 23/24-Q4 remained at Green(SRO rating). This is primarily due to the following factors. This is a complex nuclear project on an operational nuclear site. The Project is in the execution stage with manufacturing and construction activities ongoing. The SCP project is being delivered by the Programme and Project Partnership (PPP). The IPA afforded this project a RAG rating of GREEN.

Schedule: Compared to financial year 22/23-Q4, the project's end-date at 23/24-Q4 remained schedule to finish on 2031-01-23. This is primarily due to the following factors. The Project remains on schedule and there is no change to the date of 23 January 2031.

Cost: Compared to financial year 22/23-Q4, the project's departmental-agree Whole Life Cost at 23/24-Q4 increased from 1034m. to 1076m. This is primarily due to the following factors. The SCP budgeted cost (baseline) has increased by 42m, this is due to escalation in line with the agreed indices.

Source: IPA Annual Report 2023-24 (data)