Electricity warning as 40C heatwave puts pressure on power supplies

Environment
24 Jun 2026 • 4:38 PM MYT
The Independent
The Independent

The world’s most free-thinking newspaper

Electricity warning as 40C heatwave puts pressure on power supplies

  • Britain’s electricity grid operator, Neso, issued an industry warning about a potential squeeze on power supply on Wednesday evening.
  • This rare summer alert is due to extreme heat affecting the UK and the continent, combined with low wind, putting pressure on the system.
  • Neso issued an 'electricity margin notice', a message to the market requesting more capacity to be made available.
  • The notice is in effect between 7pm and 10pm on Wednesday.
  • Neso clarified that this is a 'routine tool' and does not indicate that electricity supply is at risk.

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