In 2025, over 12TWh of clean energy was curtailed across Great Britain and Ireland, resulting in curtailment payments of £363m.
Montel's Curtailed Renewables in GB and Ireland 2025 quantifies the turn down of all renewables across GB and Ireland, uncovering a growing disconnect between renewable generation and grid infrastructure capacity, something which has the potential to raise costs on consumer bills for years to come.
Assessing the amount of renewable power forced to curtail over the past year, this report analyses the costs to consumers, impacts on generators and potential solutions to infrastructure constraints, as well as the future outlook for renewable curtailment in the region.
Key insights include:
Great Britain
Over 10TWh of renewable electricity was curtailed in GB, enough to meet the demand of every domestic household in London in 2025.
The total cost of curtailment payments was £363m, representing a 10% decrease year-on-year.
The total cost of upward actions to replace lost wind power where necessary was at least £1bn, a 20% rise year-on-year.
Over 98% of the curtailed volume and 94% of curtailment costs were due to turning down wind turbines in Scotland.
Island of Ireland
2.1TWh of power was curtailed, which could have powered all domestic electricity demand for every home in County Dublin.
Solar curtailment in the Republic of Ireland has increased more than fourfold from 2024 to 2025.
In Northern Ireland, 24% of all available wind energy was curtailed.
Get the full picture, download your copy of the 2025 GB and Ireland curtailment report now.
