The amount of renewable electricity curtailed in Great Britain in 2025 would have been enough to meet the combined annual electricity demand of every household in London, according to a new report.
The report from energy market analysis provider Montel EnAppSys, Curtailed Renewables in GB and Ireland, investigates and quantifies the volume of curtailed renewable power in both Great Britain and Ireland. It uncovers a growing disconnect between renewable generation and grid infrastructure capacity.
The report reveals that over 12 Terawatt hours (TWh) of renewable power was curtailed in 2025. Of this, just over 10TWh was curtailed in Great Britain, representing a 22% increase from 2024. Over £1bn was spent on upward actions to replace lost wind generation, a 20% increase from the previous year.
Almost all of the curtailment in Great Britain (98%) resulted from the turning down of wind turbines in Scotland.
The volume of power available from renewable sources is sometimes curtailed (reduced...