Britain's electricity grid operator has issued an industry warning that power supply could be squeezed on Wednesday evening as extreme heat puts pressure on the system. The National Energy System Operator (Neso) issued a so-called electricity margin notice, a rare summer call for more power as the country braces for record-breaking temperatures.
Details of the Warning
The notice sends a message to the electricity market requesting additional capacity to be made available, allowing production to increase if necessary. Such notices are typically issued during winter when heating demand is higher. Neso stressed that the notice is a “routine tool” and “does not mean electricity supply is at risk.” The notice is in effect from 7pm to 10pm on Wednesday.
Causes of the Squeeze
A Neso spokesman explained: “Our forecasts are showing tight margins on the electricity system for tomorrow evening. This is due to the impact of extremely high temperatures affecting Great Britain and the continent and low wind.” Temperatures could hit 40°C on Wednesday and Thursday in parts of England and Wales as a “heat-dome” over western Europe brings extreme conditions.
Impact on the Grid
Extreme heat can strain the electricity system by reducing efficiency in nuclear plants, gas stations, and water cooling systems. Additionally, increased use of fans and air conditioning drives up demand. The warning underscores the challenges of maintaining supply during heatwaves, which are becoming more frequent due to climate change.
