{"id":127468,"date":"2026-10-23T12:00:00","date_gmt":"2026-10-23T11:00:00","guid":{"rendered":"https:\/\/en.econostrum.info\/uk\/?p=127468"},"modified":"2026-10-23T11:05:01","modified_gmt":"2026-10-23T10:05:01","slug":"blackout-warning-winter-power-safety","status":"publish","type":"post","link":"https:\/\/en.econostrum.info\/uk\/blackout-warning-winter-power-safety\/","title":{"rendered":"Blackout Warning: Britain\u2019s Winter Power Safety Margin Falls To Four-Year Low"},"content":{"rendered":"\n

Britain’s electricity system is facing a narrower winter safety margin, with the National Energy System Operator forecasting 5.9GW of spare capacity<\/strong> this winter, down from 6.1GW last year. The figure represents 9.5% of expected demand<\/strong>, compared with 10% in the previous winter. Neso said electricity demand had increased, with data centres, electric vehicles and heat pumps among the factors contributing to higher consumption.<\/p>\n\n\n\n

Britain Has Less Spare Power Capacity<\/h2>\n\n\n\n

The projected de-rated margin<\/strong> is the amount of generation capacity expected to remain available during periods of high demand, such as a cold winter spell.<\/p>\n\n\n\n

For the coming winter, Neso forecasts a margin of 5.9GW<\/strong>, equivalent to 9.5% of demand. Last year’s forecast stood at 6.1GW<\/strong>, or 10%. This is the first year since the outbreak of the Ukraine war in 2022 that the forecast margin has fallen.<\/p>\n\n\n\n

Neso said the electricity system remains capable of meeting demand during the forthcoming winter.<\/p>\n\n\n\n

\"Power\"
Credit: Econostrum<\/figcaption><\/figure>\n\n\n\n

 <\/h2>\n\n\n\n

Renewable Capacity Makes The Picture More Complicated<\/h2>\n\n\n\n

Britain’s total electricity generation capacity has increased from 127GW to 137GW<\/strong> over the past year. Much of that additional capacity comes from renewable sources, including wind power.<\/p>\n\n\n\n

Renewables can generate large amounts of electricity when weather conditions are favourable, but their output can vary. Gas and nuclear generation can provide different forms of supply when demand is high.<\/p>\n\n\n\n

Neso therefore uses a calculation that takes the reliability of different generation sources into account. The methodology used this year gives wind farms a higher reliability rating than the previous approach.<\/p>\n\n\n\n

Under last year’s methodology, the winter margin would have been 5.2GW, or 8.4% of demand<\/strong>.<\/p>\n\n\n\n

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It\u2019s not been a great week for confidence in energy system.

On Monday, NESO was exposed as having a culture and management that prevented workers from speaking out or reporting the truth of the massive strain the drive towards a \u2018net zero\u2019 grid was putting on the ability to keep\u2026<\/p>— Andrew Bowie MP (@AndrewBowie_MP) October 23, 2026<\/a><\/blockquote>