The UK generated 68% of its electricity from renewable sources in the first quarter of 2026 — a new record — with offshore wind now accounting for 42% of total generation, according to National Grid ESO data published today.
The Record in Context
For the first time, the UK sustained periods of 100% renewable electricity generation for more than 48 consecutive hours during March — when wind speeds were consistently high across the North Sea. The previous record was 36 hours, set in May 2025.
Offshore wind capacity has grown by 18% in the past year following the commissioning of two new large-scale wind farms off the Yorkshire coast. The UK now has more installed offshore wind capacity than any other country — approximately 15GW, ahead of China, Germany, and the Netherlands.
The Grid Challenge
High renewable penetration creates grid management challenges. When wind generation is high and demand is low — typically overnight — the grid must either curtail generation (paying wind farms to switch off) or export to interconnectors. The cost of constraint payments to wind farms reached £550 million in 2025, a figure that will grow without significant investment in battery storage and interconnector capacity.
What Still Needs to Change
Electricity generation is the easiest part of the net zero transition. Heat and transport are harder. Only 4% of UK home heating comes from heat pumps; the majority of homes still use gas boilers. Electric vehicle uptake is accelerating but is still far below the pace needed to electrify the vehicle fleet by the 2035 internal combustion engine sales ban.
