Electrical outages. cyber attacks ?

National Grid have released their interim report. I've attached it but you can also download from National Grid's website The magnitudes are exceedingly similar to the event in 2008 I mentioned before. The frequency plot does suggest rapid swings in frequency at the time of the event but while some local generation was lost due to the HV earth fault, most of the connected embedded generation stayed connected, suggesting that the ROCOF was within acceptable limits; most of the generation that was lost was as a result of issues within the plants themselves (some which have yet to be explained). The load shedding occurred 85 seconds after the event, while frequency response services (including batteries contracted for this very purpose) went from 0 to 650MW in less than 10 seconds... The story is not so much about inertia as it is an imbalance in supply and demand due to the sudden loss of supply.


It is worth remembering that this is the first time it's happened in 11 years (and required two generators and a transmission line to fall over at the same time) and the system recoved in less than half an hour.  We could pay for the extra spinning reserve to cover this event. But we have to draw a line somewhere, surely?

National Grid have released their interim report. I've attached it but you can also download from National Grid's website The magnitudes are exceedingly similar to the event in 2008 I mentioned before. The frequency plot does suggest rapid swings in frequency at the time of the event but while some local generation was lost due to the HV earth fault, most of the connected embedded generation stayed connected, suggesting that the ROCOF was within acceptable limits; most of the generation that was lost was as a result of issues within the plants themselves (some which have yet to be explained). The load shedding occurred 85 seconds after the event, while frequency response services (including batteries contracted for this very purpose) went from 0 to 650MW in less than 10 seconds... The story is not so much about inertia as it is an imbalance in supply and demand due to the sudden loss of supply.


It is worth remembering that this is the first time it's happened in 11 years (and required two generators and a transmission line to fall over at the same time) and the system recoved in less than half an hour.  We could pay for the extra spinning reserve to cover this event. But we have to draw a line somewhere, surely?