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UK Grid Operator Forecasts Stable Electricity Supply for Winter Despite Iran War

NESO said the grid has an 8.8% buffer over peak winter demand, but gas price shocks are expected to keep household bills higher.

  • The National Energy System Operator forecasts a 5.5 gigawatt electricity surplus for Great Britain this winter, representing an 8 per cent buffer against peak demand.
  • Gas prices remain volatile following the Middle East conflict and closure of the Strait of Hormuz, driving Ofgem's energy price cap up 13% from July 1.
  • Deborah Petterson, director of whole energy system resilience at NESO, said: "This has been a year of turbulence in energy markets and geopolitical uncertainty, however Great Britain's electricity system has a strong track record of reliability."
  • NESO cautioned that "tight days" could occur during cold snaps in mid-to-late January 2027, potentially requiring system notices if electricity supply fails to match demand.
  • Britain secures energy through diverse sources including North Sea supplies, renewables, and liquefied natural gas from the US, while importing electricity from France and Norway via interconnectors essential to Europe's low-carbon transition.
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Britain to have surplus of energy for winter despite Iran war, forecasts show

The National Energy System Operator (Neso) nonetheless cautioned over ‘tight days’ during potential cold snaps this winter.

·London, United Kingdom
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Britain will have enough electricity this winter, grid operator says

·New York, United States
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The new battery storage capacity and the planned renewable energy generation will help to maintain adequate margins of electricity supply in the UK during the winter of 2026-2027, according to the initial forecasts of the national energy system operator, National Energy System Operator (NESO). Related:BW ESS opens the largest battery storage system in the UKNESO noted that its base scenario foresees a tight margin of 5.5 GW for winter 2026/27, e…

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Reuters broke the news in New York, United States on Monday, June 22, 2026.
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