GB Grid Stability Digest
The week on the grid — 22–28 June 2026
Issue 2026-w26
The system imbalance price peaked at £800/MWh in settlement period 42 on 2026-06-23.
Vital signs
| This week | |
|---|---|
| System price max / min | £800/MWh / −£86/MWh |
Event of the week
The system price went negative in 17 settlement periods, bottoming at −£86/MWh.
No dashboard snapshot data reached this issue, so inertia, frequency, and demand vitals are omitted. Coverage grows as snapshot history accumulates.
Learn: Frequency events, explained
When a large generator trips, frequency falls until reserves respond. The depth of that dip — the nadir — depends directly on system inertia.
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Data: Elexon BMRS · NESO · Carbon Intensity API · Sheffield Solar · All issues