demand · major
GB power blackout disconnects ~1.1 million customers
9 August 2019 → 9 August 2019
On 9 Aug 2019 at 16:52, near-simultaneous losses at Hornsea 1 (737 MW) and Little Barford (641 MW) drove frequency below 48.8 Hz, triggering Stage 1 Low Frequency Demand Disconnection. About 1 million customers were cut off. Trains stranded; exposed under-frequency response gaps.
Affected fuels: wind_offshore, gas
Countries: GB
Sources
- www.ofgem.gov.uk(accessed 2026-08-28)
- www.ofgem.gov.uk(accessed 2026-08-28)
- www.neso.energy(accessed 2026-08-28)