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National Grid issues first capacity market notice

National Grid published its first Capacity Market Notice on Monday 31 October. It was issued four hours in advance of 4.30pm and indicated that aggregate BM unit capacity was only 220MW above the sum of the forecast demand and an operating margin.

The notice was later cancelled at 7.00pm. Notices are issued automatically when the capacity of available generation is within a 500MW threshold of National Grid’s requirement. The notice indicates a higher than normal probability of a System Stress Event occurring. Under capacity market rules, providers only need to generate or reduce demand during a System Stress Event.

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