A GB Capacity Market Notice (CMN) was issued at 2.33pm for delivery 7:00pm on Tuesday 22nd November 2022 due to a low system generation margin of 177MW. Available supply was reduced due to a combination of unexpected thermal and hydro outages (1.9GW total) and a sharp reduction in wind supply (12GW overnight fell to 3GW across the peak), with the interconnectors swinging ~4 GW day-on-day to ensure security of supply. While the CMN was cancelled, peak demand only reached 38GW across the period, well short of the ~58GW assumed by National Grid across peak winter cold spells. As we move into the depths of Winter 22, we ... (full story)