Wind Power on the UK Grid: Offshore, Onshore and Output

Wind power made up 29.5% of the UK's energy production in 2024, according to independent statistics, and 29.4% of total electricity output in 2023¹. That makes wind the single largest renewable source on the system and one of the largest sources of electricity generation in Great Britain overall. The offshore fleet alone stood at 16.6GW of capacity at the end of 2025, after 0.7GW was added during that year³.

The headline numbers hide a system under strain in one specific place. In the 2024/25 financial year, 9.4TWh of wind generation was curtailed in Great Britain, an increase of 77% on the previous year, because the network could not carry the power to where it was needed⁴. Householders pay for that through network charges, even though the wind was free. This page sets out the capacity and output figures, what drives them, how they differ across the four nations, and what wind does and does not do for a home's energy independence.

Today's installed capacity and generation figures

The UK's wind fleet divides into two very different halves. Onshore wind, the turbines on hills and ridgelines, is the older and larger part by number of machines; offshore wind, built in shallow North Sea and Irish Sea waters, is where most new capacity is being added. Offshore capacity increased by 0.7GW in 2025, bringing the UK's total to 16.6GW³.

Output has grown faster than most people notice. As recently as 2012, wind farms generated 5.5% of total electricity in the UK; by 2023 wind alone stood at 29.4% of output, with solar adding a further 4.9%². Independent statistics put wind and solar together at 32.91% of UK electricity generation in 2023 and 34.28% in 2024⁵. Ember, an independent energy think tank, reported that wind and solar reached a combined 34% of UK power generation in 2023⁷. In 2025, wind and solar generated more than 100 terawatt hours of electricity in the UK, meeting a third of total demand⁸.

Offshore wind on its own hit a record in 2023, generating 49.5TWh, which accounted for just under a fifth, 17.3%, of overall energy production in the UK⁹. Electricity North West, a distribution network operator, describes the installed wind fleet as having enough capacity to meet 20% of the UK's electricity demand¹⁰. The system operator's own planning documents go further: wind and solar generation made up 43% of GB energy supply in 2022, and in all scenarios modelled by NESO, wind and solar make up over half of domestic GB electricity generation by 2027¹¹.

For a householder, the practical meaning of these numbers is that on a windy day, most of the electricity in your sockets is wind-generated, and on a still, cold evening in winter, very little of it is. The annual averages are real, but the hourly reality swings far more than the yearly figure suggests.

Factors that determine how much wind power is produced

The first driver is geography. The UK is estimated to have around 40% of Europe's wind blowing over it, which puts it in a prime position to take advantage of wind power¹². That resource is why wind, rather than solar, became Britain's dominant renewable: the same Atlantic weather systems that make the country cool and cloudy also make it windy.

The second driver is the sheer scale of deployment. Onshore wind farms in the UK generate enough energy to power 9.9 million homes for an entire year, according to Smart Energy GB, citing industry figures¹³. Offshore build-out has accelerated as turbine sizes have grown and as auctions have brought forward new capacity, and the UK's goal is to generate a third of electricity from wind farms by 2030¹³.

The third driver is the shape of the rest of the system. As coal has left the grid and gas output has fallen, wind's share of what remains has risen even in years when wind output itself grew only modestly. In 2024, the UK generated 10.85% less electricity than in 1990, with over a third of that energy generated by wind and solar⁵. A smaller total being met increasingly by wind means the share climbs quickly.

The fourth driver is the electrification of heating and transport. An international heat pump technology publication notes that in the UK, supply will be dominated by wind power¹⁴, and the Climate Change Committee's analysis of faster electrification assumes a wind-heavy system supplying heat pumps and electric vehicles. Wind output does not just follow the weather; it follows the design of the whole system around it.

Paying wind farms to switch off

The most important fact about wind output that most householders have never heard of is curtailment. When wind farms generate more power than the transmission network can carry to demand centres, the system operator pays them to turn off. This is not a failure of the wind farms; it is a failure of the wires between windy Scotland and demand-heavy England to keep pace with the growth in generation.

The numbers are large and getting larger. The Climate Change Committee reports that there was 9.4TWh of wind curtailment in Great Britain in the 2024/25 financial year, an increase of 77% on the previous year, and that the proportion of potential annual wind generation that was curtailed rose from 8% to 13%⁴. Carbon Brief reports the same 9.4TWh figure for 2025, up 77% on 2024³.

To put 9.4TWh in household terms, it is electricity that was available, that cost nothing in fuel to produce, and that was instead paid for twice: once to the wind farm for not generating, and once to whatever filled the gap elsewhere. Those payments flow through balancing costs, which are recovered from electricity bills. The problem is expected to ease as new transmission capacity is built, including the Eastern Green Link and other undersea cables designed to move Scottish wind power south, but until then the constraint is structural.

Curtailment also has a price effect householders can see on the wholesale market. When wind output is very high and demand is low, wholesale prices can fall to zero or below, which is explored on our page about negative electricity prices. How the grid is kept balanced minute by minute is covered in balancing services and frequency response, and the charges that carry curtailment costs onto bills are explained in transmission and balancing charges.

Wind's differing share in England, Scotland, Wales and Northern Ireland

Wind's contribution is not spread evenly across the UK, and the differences matter for anyone comparing their region's energy position.

Scotland is the wind heartland. The Scottish Government's 2019 annual energy statement recorded that Scotland generated a higher share of its electricity from renewables than the UK as a whole, 29.3% for Scotland compared with 25.6% for the rest of the UK excluding Scotland¹⁵. Scotland hosts a large share of the UK's onshore turbines as well as major offshore developments, and much of the curtailment problem arises because Scottish generation regularly exceeds what Scottish demand and the cross-border cables can absorb. The details are on our page about energy supply in Scotland.

Wales is similarly wind-weighted. Official statistics show that 70% of all renewable electricity generation in Wales in 2021 came from onshore and offshore wind¹⁶. That concentration reflects both the wind resource across the Welsh uplands and the offshore farms in the Irish Sea. See energy supply in Wales for the full picture.

England has the largest share of demand but a smaller share of wind generation relative to its consumption, which is precisely why power flows north to south and why the transmission constraints bite. Northern Ireland, which is part of the all-island single electricity market with the Republic of Ireland, has its own system, its own wind fleet and its own balancing arrangements, described in energy supply in Northern Ireland.

The national differences feed directly into the curtailment figures in the previous section: the wind is mostly in the north and west, the demand is mostly in the south and east, and the network between them is the bottleneck.

The goals and policies guiding wind growth

Wind's growth is not happening by accident; it is being driven by a set of government targets and support schemes that have changed shape over the years.

The current headline ambition is up to 50GW of offshore wind by 2030, including up to 5GW of floating offshore wind, as set out in NESO's planning documents¹⁷. Earlier government statements spoke of 40GW of offshore wind deployment plans¹⁸, and the Climate Change Committee described an ambition growing from 40GW in 2030 to 100GW or more by 2050¹⁹. The Climate Change Committee's position is that offshore wind forms the backbone of the future system²⁰.

Delivery is running behind the ambition. Offshore capacity stood at 16.6GW at the end of 2025³, and the latest renewables auction in early 2026 secured 8.4GW of offshore wind overall²¹. Even if all of that is built on schedule, reaching 50GW by 2030 requires a build rate well above anything achieved so far, and the Department for Energy Security and Net Zero's own performance report acknowledges supply-chain bottlenecks including ports, vessel capacity, manufacturing capability and floating wind²¹.

The support schemes behind the build-out have changed over time. The Renewables Obligation, a closed scheme still funded through bills, financed much of the early onshore fleet, and Contracts for Difference now underwrite new offshore projects; both are explained on their own pages, the Renewables Obligation and Contracts for Difference. Before those, small-scale wind was supported through the Feed-in Tariff, whose official tariff tables set generation rates for wind installations according to their size, with different rates applying to different bands and periods²². That scheme closed to new applicants, but the turbines it paid for are still generating.

The direction of policy has been consistent across governments of both parties. As far back as a 2010 official consultation, the expectation was that renewable generation, principally wind, would need to meet around 30% of electricity demand to reach the UK's 15% renewable energy target for 2020²³. Wind met and exceeded that expectation, and the 2030 goal is now to generate a third of electricity from wind farms¹³.

Wind power and your home's self sufficiency

Wind power changes the UK's energy position more than any single household technology could. In 2024, 51% of UK electricity generation was from renewable sources such as solar power and wind power⁶, and over a third of Britain's electricity is generated by wind, solar or hydro²⁴. Every unit of wind generation is a unit that does not need imported gas, does not expose the country to global fuel price shocks, and does not depend on the goodwill of foreign suppliers. That is national energy independence in the most literal sense, and it is the reason wind's growth features in every serious energy security plan, as our page on energy security and household independence sets out.

But wind does not make an individual home independent, and it is worth being precise about what remains. A household with a wind-powered grid still depends on:

• The transmission and distribution network, which must carry the power from remote wind farms to the home, and whose constraints cause the curtailment costs described above.
• Gas-fired generation, which fills the gap when wind output is low, and whose fuel price still sets the wholesale price much of the time, as explained in how the wholesale markets work.
• A supplier and a tariff, since the electrons arriving at the meter are not physically traceable to any wind farm.
• The system operator, which balances wind's variability second by second, and whose costs appear on every bill.

Households can capture more of wind's benefit in two ways. A green tariff matches your usage with renewable generation, and some suppliers go further: Good Energy, for example, offers tariffs powered by 100% renewable energy generated in the UK by independent producers²⁵. And a time-of-use tariff, or a smart meter enabling demand flexibility, lets a home shift consumption into windy periods when wholesale prices are low, which is the closest a bill payer gets to buying wind power directly.

Generating wind power at home is a much smaller proposition. An independent field trial into small-scale wind estimated its potential at approximately 0.9% of UK electricity supply²⁶, and output depends entirely on having a windy, unobstructed site, which most suburban homes do not. For individual energy independence, wind works at national scale; homes work best with other technologies and with flexible timing.

Why the data sources conflict

Anyone comparing wind statistics across sources will meet numbers that differ, and it helps to know why rather than to assume one is simply wrong.

The wind share itself varies by year and by measure. Independent statistics put wind at 29.5% of UK energy production in 2024¹, while official guidance records 29.4% of UK electricity output in 2023². These are different years and slightly different measures, so they differ without contradicting each other. Wind and solar combined were 34.28% of UK electricity generation in 2024⁵, and Ember reported the pair at a combined 34% of UK power generation in 2023⁷; again, different years, and the two figures are consistent with each other.

The renewables share shows a wider spread. The House of Commons Library reports that 51% of UK electricity generation in 2024 was from renewable sources⁶, while the Development Bank of Wales states that about 42% of the UK power grid comes from renewable sources, with wind the biggest contributor²⁷. The 42% figure is an estimate from a different point in the build-out and a different basis of counting; the 51% figure is the more recent official statistic and is the one to rely on for 2024.

The offshore wind targets differ too, and the difference is one of policy history rather than error. The government's stated ambition is up to 50GW by 2030, including up to 5GW of floating offshore wind¹⁷, while earlier statements and the Climate Change Committee's 2020 report spoke of 40GW in 2030, growing to 100GW or more by 2050¹⁹. The 50GW figure is the later, more ambitious commitment; the 40GW figure is the earlier one. Neither has been met yet: capacity stood at 16.6GW at the end of 2025³.

Even the curtailment figure appears in two forms: the Climate Change Committee reports 9.4TWh of wind curtailment in Great Britain in the 2024/25 financial year⁴, and Carbon Brief reports 9.4TWh curtailed in 2025, up 77%³. The two accounts describe the same underlying event over overlapping periods, and the 77% increase is common to both. When reading wind statistics, always check the year, whether the figure covers wind alone or wind and solar, whether it is capacity or output, and whether it covers the UK, Great Britain or a single nation: most apparent contradictions dissolve once those four questions are answered.