Great Britain’s grid operator has issued a rare summer power supply warning for Wednesday evening as a heatwave intensifies, pressuring the energy system. The National Energy System Operator (Neso) released an electricity margin notice late Tuesday, asking power plant owners to provide any extra generation capacity.
The warning signals an unusual strain on the grid during summer months, typically characterized by lower demand. The heatwave has driven households to turn on fans and air conditioning, pushing up electricity consumption and narrowing the buffer between supply and expected demand.
Neso issued the margin notice to bolster the reserve margin ahead of peak evening hours. The operator did not specify exact megawatt shortfalls, but the request for additional power from plants highlights the tightness in available supply.
If the heatwave persists, further warnings could follow, potentially testing the grid's resilience. Consumers may face higher prices if generators command premiums for extra output during the constrained period.
The warning comes despite Great Britain's growing renewable capacity, which can be less predictable during extreme weather. Critics may argue that the grid's reliance on just-in-time generation leaves it exposed to heatwaves and other climate-driven demand spikes.