GB grid events
Electricity Margin Notices and other NESO system warnings, as published — with the stated shortfall, the timings, and whether the notice was cancelled.
Electricity Margin Notice, 8 July 2026
1,200 MW shortfall · cancelled
Electricity Margin Notice, 23 June 2026
1,900 MW shortfall · cancelled
Source: NESO via Elexon BMRS (SYSWARN) · GB inertia data · weekly digest