Neso calls for backup generation in UK after wind power slump

The UK grid operator, National Energy System Operator (Neso), issued an electricity margin notice on Sunday, November 8, 2026, for Monday morning, citing a projected shortfall of nearly 1,400 megawatts (MW) between 6:00 and 11:00, attributed to low wind generation in Europe.

The notice, reported by Bloomberg, anticipated a supply gap of nearly 1,400 MW and asked the market for additional capacity. The Guardian detailed that Neso needed about 800 MW, equivalent to a mid-sized gas plant, in the eight hours before a review at 4:00. After that review, the shortfall fell to 500 MW, then later to 200 MW, and the notice was cancelled shortly after 9:00. The episode matters to the region because it describes the cost of firmness in systems with high renewable penetration: the operator must contract dispatchable capacity when wind and sun fall short, a criterion that grid operators such as Mexico's CENACE build into scheduling dispatch and reserves.

A Neso spokesperson described the notice as a routine, precautionary measure to give the market the opportunity to enable additional capacity, and said it was not a warning of power cuts or a risk to customer supply. The independent consultant Kathryn Porter put payments for imports via subsea cables at 2,500 pounds per megawatt-hour and the start-up of gas plants at 1,000 pounds per MWh, according to The Guardian. The notice was issued with no constraints on the grid and while the country expected to export electricity, which points to low wind speeds in northern Europe, a phenomenon the sector calls Dunkelflaute.

Margin notices were previously concentrated in cold winter evenings; this one came in the morning and followed a series of alerts issued during the summer. The next signal will be how the margin behaves in the weeks of peak winter demand and the cost of the imports Neso contracts to cover it.

This article was drafted with the assistance of artificial intelligence from verified sources and reviewed by a human editor before publication.