NESO has issued its first morning margin notice in at least three years, after Britain's stillest weekend for wind since 2022

Monday, 06:00 to 11:00, 1,388 MW short. The wind has gone, 4 GW of gas is out, Ireland can't help, and fog may hide the morning sun. Yet the public numbers say the evening is tighter.

At 19:17 on Sunday, NESO issued an Electricity Margin Notice for 06:00 to 11:00 on Monday. It said the system was 1,388 MW short of the margin it wants to hold, and that none of that was down to network constraints. NESO said it would review the notice at 04:00 on Monday. Until then it waits to see whether generators answer the call, whether the fog arrives and whether the wind does anything at all. It is going to be a tense night in the control room.

Every margin notice in Elexon's records, which go back to May 2023, has covered an afternoon or evening peak. This is the first for a morning.