The United Kingdom’s solar sector has recorded an impressive surge, adding 1.9 GW of new solar capacity in just 12 months up to October 2025.
This growth takes the country’s total installed solar capacity to 20.7 GW, marking a 10.4% year-over-year increase and reflecting the accelerating momentum behind clean energy adoption.
Much of this boost comes from the rapid deployment of utility-scale solar farms, including the notable commissioning of the 373 MW Cleve Hill Solar Farm in July 2025—now the largest operational solar project in the UK.
A Year of Steady Growth
Government data reveals that 111 MW of capacity was added in October alone, across more than 25,000 installations nationwide. While the UK added 1.78 GW in the first 10 months of 2025 compared to 2.12 GW during the same period in 2024, authorities expect this figure to rise as new data is updated.
Despite most installations being domestic, these account for only 30% of the UK’s total capacity. Ground-mounted solar is now the dominant contributor, representing nearly 58% of overall capacity when combining accredited and unaccredited installations.
Utility-Scale Solar Leading the Way
Large solar farms accredited under the Contracts for Difference (CfD) scheme played a major role in the 2025 surge.
- 18 CfD-backed solar farms are currently operational.
- 16 of them were commissioned in 2025, showcasing rapid scaling and smoother execution pipelines.
The pipeline of projects approved under the Nationally Significant Infrastructure Project (NSIP) framework has also grown significantly, as Energy Minister Ed Miliband continues greenlighting gigawatts of new solar capacity.
Policy Support Strengthens Consumer Confidence
A key highlight from the UK’s Autumn Budget 2025 was a policy shift aimed at reducing household energy costs. Starting April 2026, the government will cover 75% of the Renewables Obligation (RO) charge, which previously burdened electricity bills.
This move is expected to save households roughly £100 per year, offering relief while further supporting renewable expansion.
Introduced in 2002, the RO scheme played a crucial role in the early growth of UK renewables. Today, more than 7.4 GW of solar remains accredited under this scheme.
Industry leaders have welcomed the reform. Solar Energy UK Chief Executive Chris Hewett noted that aligning RO funding with general taxation is both “welcome and expected” and will contribute to long-term reductions in household power bills.
The Road Ahead
The UK government has also extended its consultation on how inflation adjustments should apply to RO and feed-in-tariff (FiT) payments in the future, with industry stakeholders invited to submit views until December 2, 2025.
This indicates continued refinement of policies to support sustained solar adoption and protect investors.
With a strong project pipeline, stable policy updates, and growing large-scale deployment, the UK solar sector is well-positioned for another year of steady expansion.
The addition of nearly 2 GW in a single year marks not just progress but a promising shift toward a more energy-secure and climate-conscious future.