What is the UK's projected electricity supply margin for the upcoming winter, and how does it compare to recent years?

The UK is projected to have a spare generation capacity buffer of 8.8% of peak winter demand from November to April, which is similar to the margins in the last two winters but slightly below last winter’s 10% margin and higher than the margin during the 2022 energy crisis triggered by Russia’s invasion of Ukraine.

According to Neso, what does the current assessment indicate about the reliability of the UK’s electricity system this winter despite geopolitical disruptions?

Neso states that its early assessment shows a positive picture for the coming winter, with sufficient electricity margins expected throughout, confirming the UK’s electricity system remains reliable despite turbulence in energy markets and geopolitical uncertainty—including disruption linked to the Iran war—and that supply will meet the UK government’s reliability standard.

UK Winter Power Supply Secure Despite Iran Disruption, Says Neso

Jun 22, 2026

Neso confirms the UK will have secure winter power supplies with an 8.8% spare capacity buffer despite geopolitical disruptions from the Iran conflict.

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UK Winter Power Supply Secure Despite Iran Disruption, Says Neso

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