Capacity and production statistics

Gas was the largest source of Britain’s electricity as the first quarter of the year was punctuated by long spells of calm weather. Offshore wind output will continue growing, as the 0.9 GW Moray West came online in April, and the 1.2 GW Dogger Bank A is scheduled for completion later this year. However, Ørsted cancelled their plans to expand Hornsea 4 due to increasing costs.

The Greenlink Interconnect came online, adding 504 MW of transmission capacity between Wales and Ireland. The new link is expected to improve “both countries’ energy security, resilience and ability to harness clean power”. So far, this has increased the need for electricity generation in Britain, as it has mostly exported power to Ireland.

Britain’s electricity supply mix in the first quarter of 2025.

Power flow between mainland Britain and the island of Ireland, highlighting the new Greenlink Interconnect.

Installed capacity and electricity produced by each technology.1 2

1 Other sources give different values because of the types of plant they consider. For example, BEIS Energy Trends records an additional 0.7 GW of hydro, 0.6 GW of biomass and 3 GW of waste-to-energy plants.
These plants and their output are not visible to the electricity transmission system and so cannot be reported on here.
2 We include an estimate of the installed capacity of smaller storage devices which are not monitored by the electricity market operator.