23 Aug 2019
GB load loss on 9 August 2019
On 9th August, from around 4:54 pm, there were power cuts in Great Britain, affecting around 1GW (5%) of demand.
This loss of load was the automated response to a low frequency incident (in which the system frequency fell to 48.9Hz or less), as a consequence of the near simultaneous tripping of two power stations, and around 500MW of embedded generation, “each associated with” (according to National Grid ESO) a significant lightning strike on a transmission circuit.
This note contains further details on the cause of the power cuts, how this links to the changing generation mix, outstanding questions, and background material on frequency response.
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