Solar generation accounted for 6. 3% of Great Britain's power in 2025, according to mid-December data from grid operator NESO. The new record was a result of increased deployment and favorable weather conditions. Clean. Real-time UK solar output from Sheffield Solar PVLive and NESO embedded generation data — covering rooftop, distributed, and utility-scale solar across Great Britain. Quinbrook Infrastructure Partners' Cleve Hill, the UK's largest solar plant, came online this year. View the full generation mix or focus on renewables, fossil fuels, low‑carbon, or other sources. Compare generation and demand trends with carbon emissions across multiple charts to. Solar power has a growing role in electricity production in the United Kingdom, contributing around 6.