We have confirmed the Mock System Stress Event Reporting periods for the 2025/26 Delivery Year as follows:
| 1st Reporting Period | 24 November – 17 December 2025 |
| 2nd Reporting Period | 17 February – 12 March 2026 |
The Mock System Stress Event Reporting is to address data quality issues to improve the overall settlement accuracy if a System Stress Event were to happen.
For further details on this activity please refer to our Settlement Data for Capacity Providers and select the ‘Mock System Stress Event Reporting’ drop down. The Latest Change – Mock System Stress Event Reporting webpage provides useful information to support Capacity Providers in reviewing the Mock System Stress Event Reporting received.