Record Year for UK Wind and Solar Power Generation

Wind and solar deliver majority of UK electricity for first time

Britain crossed a historic energy threshold in 2025. For the first time, renewable sources supplied more than half the country’s electricity. Wind turbines, solar panels, and biomass plants generated 52.5% of total power, according to provisional government figures.

This marks a fundamental shift in how the UK powers itself. Gas, once the dominant fuel, now takes second place. Meanwhile, coal disappeared entirely from the grid after the last plant closed in September 2024.

The numbers tell a clear story. Total renewable generation reached 152 terawatt hours in 2025, up 6% from the previous year. Wind alone produced 87 terawatt hours, making it the single largest electricity source. Solar contributed 19 terawatt hours after a record year of sunshine, while biomass added 41 terawatt hours.

For UK businesses, this represents more than environmental progress. It signals a structural change in energy markets, with implications for costs, supply security, and compliance planning.

Exceptional weather and new capacity drive generation surge

Two factors combined to push renewables past the 50% mark. First, 2025 was the sunniest year since 1910, with 1,622 hours of sunshine. Solar output jumped 31% compared to 2024 as panels across the country captured more energy.

Second, new generation capacity came online throughout the year. Developers added 4.1 gigawatts of renewable capacity, split roughly 70% solar and 30% offshore wind. Wind capacity reached 33 gigawatts by September, up 4% year on year.

Solar expansion accelerated particularly fast. Planning authorities approved 677 solar projects during 2025, adding 6,075 megawatts of potential capacity. This exceeded the previous record set in 2023 by 37%.

The National Energy System Operator recorded several notable peaks. On 5 December, wind generation hit 23.8 gigawatts, meeting 52% of demand at that moment. On 8 July, solar reached 14 gigawatts, supplying 40% of the grid. Combined renewable output peaked at 31.3 gigawatts on 4 July, covering 84% of electricity demand.

These peaks matter because they demonstrate technical capability. The grid can now handle sustained periods of high renewable input without stability issues. Britain ran on 100% clean electricity for 87 consecutive hours during the year, a new record.

Coal exits as gas maintains backup role

The renewable surge coincided with coal’s final departure. The UK generated zero electricity from coal in 2025, down from 2 terawatt hours in 2024. The last coal plant shut permanently in September, ending 142 years of coal power generation.

However, gas generation increased slightly despite renewables’ growth. Total electricity demand rose during 2025, requiring all available sources. Gas plants produced an estimated 75 to 80 terawatt hours, representing roughly 27% to 28% of the mix.

This reveals an important dynamic. Renewables can dominate on windy or sunny days, but gas still fills gaps when conditions are less favorable. Consequently, gas capacity remains commercially valuable as a backup resource, particularly for industries requiring stable baseload power.

Carbon intensity fell to 120 grams of CO2 per kilowatt hour across the year. In December alone, zero-carbon sources (renewables plus nuclear) supplied 67% of electricity, up 11 percentage points from December 2024. Therefore, the grid is becoming cleaner even as total demand grows.

Quarter by quarter variation shows seasonal patterns

Renewable performance varied considerably across the year. The third quarter (July to September) saw the highest share at 54.7%, driven by strong solar output. Solar generation rose 26% in that quarter compared to the same period in 2024, reaching 6.6 terawatt hours.

Meanwhile, the rolling 12-month average to January 2026 showed renewables at 44.9% of generation. Wind contributed 24.2%, biomass 7.1%, and solar 6.1%. These figures from the Department for Energy Security and Net Zero confirm the trend is sustained rather than a brief spike.

Quarterly data matters for businesses with flexible operations. Energy-intensive manufacturers can increasingly time production to match periods of high renewable output and lower prices. Conversely, they need contingency plans for periods when renewables underperform.

Wind output 87 terawatt hours in 2025

• Wind turbines generated 87 terawatt hours in 2025, making wind the UK’s largest single electricity source for the first time, surpassing gas generation.
• Solar panels produced a record 19 terawatt hours, up 31% from 2024, boosted by the sunniest year since 1910 with 1,622 sunshine hours.
• Total renewable generation reached 152 terawatt hours (including biomass), securing a 52.5% share of electricity supply, up from 119 terawatt hours the previous year.
• Britain operated coal-free for an entire calendar year after the last coal plant closed in September 2024, down from 2 terawatt hours in 2024.
• Developers added 4.1 gigawatts of new renewable capacity during 2025, with solar accounting for approximately 70% and offshore wind making up most of the remainder.
• The grid achieved 100% clean electricity generation for a record 87 consecutive hours, while carbon intensity dropped to 120 grams of CO2 per kilowatt hour.

Supply chain and procurement implications for businesses

This energy transition creates specific commercial consequences for UK businesses. Companies with high electricity consumption now face a different risk profile. Renewable-heavy grids typically show greater price volatility, with costs dropping during high wind or sun but rising when weather conditions deteriorate.

Businesses should review their supply contracts accordingly. Fixed-price agreements offer protection from volatility but may cost more on average. Time-of-use tariffs can deliver savings if operations can flex to match renewable generation patterns. However, this requires operational changes that not all businesses can accommodate.

Supply chain managers face growing pressure on sustainability credentials. Large buyers increasingly require suppliers to demonstrate low-carbon operations. A renewable-powered grid makes this easier for UK manufacturers, potentially strengthening their competitive position in tenders where environmental criteria carry weight.

Procurement policy note 06/21 already requires carbon reduction plans from public sector suppliers. As the grid decarbonizes, businesses can show lower Scope 2 emissions (from purchased electricity) without changing anything themselves. Nevertheless, buyers now expect action on Scope 1 (direct) and Scope 3 (supply chain) emissions too.

Energy security considerations have shifted as well. Gas imports still matter when renewable output drops, creating continued exposure to international price shocks. Companies dependent on stable baseload power should assess backup options such as on-site generation or battery storage. Similarly, businesses with valuable storage space might explore grid services contracts that pay for demand flexibility.

Compliance and reporting considerations

Energy mix data affects carbon reporting obligations. UK businesses above certain thresholds must report their greenhouse gas emissions annually. The grid’s carbon intensity directly determines reported Scope 2 emissions from purchased electricity.

As carbon intensity fell to 120 grams per kilowatt hour in 2025, companies buying grid electricity can report lower emissions than in previous years, even with unchanged consumption. This helps meet reduction targets and improves ESG disclosures.

However, auditors and stakeholders increasingly scrutinize emissions claims. Businesses must use accurate, location-based emission factors in their calculations. The government publishes updated factors annually through the Department for Energy Security and Net Zero. Using outdated figures or incorrect methodologies can undermine reporting credibility.

Furthermore, some customers and investors now ask about renewable electricity sourcing specifically. Grid mix improvements help, but don’t constitute dedicated renewable procurement. Companies wanting to claim 100% renewable power need separate evidence such as Renewable Energy Guarantees of Origin certificates or power purchase agreements with specific projects.

Our compliance team supports carbon reporting and ESG disclosure requirements, helping businesses navigate measurement methodologies and reporting standards. We work with SMEs to ensure their emissions data withstands scrutiny while accurately reflecting operational reality.

Infrastructure challenges still constrain growth

Despite impressive generation figures, significant obstacles remain before the UK can reach its 2030 clean power target. The electricity grid itself needs substantial upgrading to accommodate further renewable capacity.

Connection queues for new projects now stretch several years in many areas. Developers have projects ready to build but cannot connect them to the grid. This delays capacity additions and slows the transition pace, particularly affecting newer technologies like battery storage.

Transmission infrastructure built for centralized coal and gas plants must adapt to distributed renewable generation. Offshore wind farms in Scotland need cables to demand centers in England. Solar installations across southern counties require reinforced distribution networks. These upgrades take time and money.

Energy storage remains insufficient to balance supply and demand effectively. Battery installations are growing but cannot yet store enough electricity to cover extended periods of low wind and sun. Pumped hydro storage capacity is limited and expensive to expand. Hydrogen storage technologies are still emerging.

Consequently, gas plants will likely remain necessary for several more years. They provide dispatchable power that can ramp up quickly when renewables underperform. This creates ongoing exposure to gas price volatility and limits how quickly carbon intensity can fall further.

Government targets require accelerated deployment

The government aims for a decarbonized power system by 2030. Achieving this from the current 52.5% renewable share requires dramatic acceleration. The National Energy System Operator estimates the UK needs to add around 50 gigawatts of offshore wind alone by 2030, roughly tripling current capacity.

Solar deployment must continue at the 2025 pace or faster. Planning reforms introduced during 2024 and 2025 aim to speed approvals, but local opposition to large solar farms persists in some areas. Balancing energy needs with land use and community concerns will test policymakers.

Meanwhile, nuclear capacity is expected to decline before new plants come online. Several aging reactors face closure this decade. New nuclear projects at Hinkley Point C and Sizewell C won’t compensate quickly enough, creating a gap that renewables and gas must fill.

Investment certainty matters significantly. Developers need stable policy frameworks and confident returns to commit billions in capital. Changes to subsidy schemes, planning rules, or grid connection terms can derail projects or slow development pipelines.

Cost trends and business planning

Renewable electricity generally costs less to generate than gas power, particularly when fuel prices are high. However, system costs (grid upgrades, backup capacity, storage) add complexity to price comparisons. For businesses, the important factor is the final retail price, not generation cost alone.

Electricity prices fell during 2025 compared to the 2022-2023 spike but remained above pre-pandemic levels. Higher renewable penetration contributed to this moderation by reducing reliance on expensive gas imports. Nevertheless, prices still fluctuate with gas markets because gas plants set the marginal price when they’re running.

Businesses should plan for continued volatility. Long-term power purchase agreements can lock in prices for part of consumption. On-site solar installations offer another option, though capital costs and roof suitability limit viability for many SMEs. Energy efficiency improvements remain the most reliable way to reduce exposure to price swings.

The SBS net zero program helps businesses assess renewable procurement options and carbon reduction strategies within realistic budget constraints. We focus on practical measures that improve both environmental performance and cost management.

What this means for business planning

The 52.5% renewable share confirms that clean electricity is now Britain’s default, not an alternative. This baseline will only increase as more capacity connects and older fossil plants retire. Businesses should factor this into medium-term planning.

Companies reviewing premises or expansion plans should consider electricity infrastructure carefully. Sites near grid connection points or with space for on-site generation may offer advantages. Properties in areas with weak grid connections might face constraints or higher upgrade costs.

Recruitment and training needs may shift too. Technical roles increasingly require understanding of renewable energy systems, battery storage, and smart grid technology. Facilities managers need different skills than they did when energy supply was simpler and more centralized.

Competitive positioning will increasingly reflect energy credentials. Export markets, particularly in Europe, place growing emphasis on product carbon footprints. UK manufacturers can leverage the cleaner grid in their marketing and customer discussions, but must back claims with verified data.

Risk management frameworks should account for energy transition dynamics. Physical risks (extreme weather affecting supply), transition risks (policy changes, technology shifts), and market risks (price volatility) all require attention. Boards should understand how energy strategy aligns with business strategy.

Additional resources and government data

The Department for Energy Security and Net Zero publishes detailed electricity generation statistics through its Energy Trends series. Monthly and quarterly updates provide generation data by source, capacity figures, and carbon intensity metrics.

National Energy System Operator releases real-time grid data and analysis through its data portal, showing live generation mix and system demand. This helps businesses understand daily patterns and plan flexible operations.

Carbon Brief maintains comprehensive analysis of UK electricity generation trends, with detailed breakdowns of renewable performance and context on policy developments.

The Climate Change Committee provides independent assessment of UK progress toward emissions targets in its annual progress reports to Parliament, including detailed chapters on power sector decarbonization.

Businesses requiring support with carbon measurement, renewable procurement, or compliance obligations can explore training resources through SBS Academy, covering practical implementation of net zero strategies for UK SMEs.