GB Grid Stability Digest
The week on the grid — 10–16 August 2026
Issue 2026-w33
Wind and solar peaked at 54.7% of GB generation at Tue 14:15.
System inertia ranged from 125.1 GVA·s to 204.8 GVA·s (average 163.6 GVA·s).
Vital signs
| This week | vs last week | |
|---|---|---|
| Inertia min / avg / max | 125.1 / 163.6 / 204.8 GVA·s | ▲ +21.3 GVA·s (min) |
| Frequency range (sampled) | 49.814–50.171 Hz · 158 samples beyond ±0.1 Hz | ▼ −0.013 Hz (min) |
| Peak wind + solar share | 54.7% (Tue 14:15) | ▼ −23.9 pp |
| Peak demand | 24.2 GW (Fri 01:15) | ▼ −1.8 GW |
| System price max / min | £349/MWh / £48/MWh | ▲ +£151/MWh (max) |
Event of the week
The system imbalance price peaked at £349/MWh in settlement period 44 on 2026-08-13.
Learn: Understanding RoCoF
Rate of Change of Frequency measures how fast grid frequency moves after a disturbance. Protection relays act on it, so operators keep it within tight limits.
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Data: Elexon BMRS · NESO · Carbon Intensity API · Sheffield Solar · All issues
Free to reuse with attribution (CC BY 4.0).