UK power supply forecasts warn of 'tight winter days' as costs soar

The UK's energy operator predicts potential "tight days" in December and January, despite energy prices more than doubling. National Gas and National Energy System Operator (Neso) forecasts indicate a small number of low surplus days, requiring routine balancing tools like electricity margin notices. Despite a 180% rise in front-month gas prices and a 120% increase in power prices since the US-Iran war, Neso maintains confidence in meeting peak demand throughout the winter.

Peak gas demand is forecasted to reach 493 million cubic metres per day, a 2% increase from last year, primarily due to stronger demand from power stations. Peak gas supply capacity stands at 592 million cubic metres per day, leaving a buffer of 99 million cubic metres. However, a highly unlikely stress scenario, such as the failure of the largest transmission system component, would reduce the buffer to 18 million cubic metres.

The UK's gas storage levels are the lowest in Europe at 48% of capacity, and global liquefied natural gas market disruptions could still impact supplies. On the power side, there is spare capacity of 5.9 gigawatts above peak demand, equivalent to 9.5% of peak demand, during typical cold spells. This margin is higher than the 2022 energy crisis and is attributed to additional battery storage, gas-fired generation, and wind power.

National Gas reached a last-minute deal with a Belgian interconnector firm, enhancing gas import capacity and maintaining grid flexibility during times of demand strain.