Power system records

The first quarter of 2025 saw relatively few records broken on Britain’s power system. Wind and solar power both edged upwards in March, with wind producing more than 72% of demand on 30 March, and solar smashing its previous record of 10.7 GW by producing 12.2 GW on 18 March. Biomass had both a record daily output and record month in February, producing close to 3 GW averaged over the month.

The tables below look over the past sixteen years (to 2009) and report the record output and share of electricity generation, plus sustained averages over a day, month, and a calendar year. Cells highlighted in blue are records that were broken in the first quarter of 2025. Each number links to the date it occurred on the Electric Insights website, so these records can be explored visually.

3 Note that Britain has no inter-seasonal electricity storage, so we only report on half-hourly and daily records. Elexon and National Grid only report the output of large pumped hydro storage plants. The operation of battery, flywheel and other storage sites is not publicly available.