The UK passed two million solar installations in March 2026, according to figures published by the Department for Energy Security and Net Zero. It is a milestone that would have seemed ambitious just a few years ago, and the numbers behind it tell an interesting story about where domestic energy is heading.
What the March 2026 data shows
More than 27,000 solar installations were completed in March 2026 alone, the highest monthly total since 2012. Two thirds of those were on domestic properties. Total solar capacity across the UK now stands at 22.1 gigawatts, up 11.7 percent over the past year. In the same month, the National Energy System Operator recorded solar output passing 15 gigawatts for the first time on the British grid.
Energy Secretary Ed Miliband described the figures as the clean energy mission in action, noting that the growth was being driven by households taking direct control of their energy costs at a time of ongoing global price volatility.
Why growth is accelerating
Several things are driving the surge at once. Panel prices have fallen significantly over the past three years. The government has committed £15 billion to a home energy efficiency programme that includes grants and loans for new rooftop installations. The Future Homes Standard now requires solar to be fitted as standard on new builds. And the legalisation of plug-in solar, announced in March 2026, is opening up the market to the five million or so households in flats and rented properties who previously had no viable route into solar generation.
Solar panel installations at Hive, one of the larger domestic energy providers, rose 173 percent in the first three months of 2026 compared to the same period in 2025. That kind of growth rate, if it continues, would push the UK’s annual installation figures well above anything previously recorded.
Where plug-in solar fits in
The two million milestone is built almost entirely on rooftop solar. Plug-in solar is not yet counted separately in the government data, and the BSI product standard that will unlock mass-market retail sales is not expected until July 2026. But the trajectory is clear. Germany, which legalised balcony solar in 2023, registered over 426,000 new plug-in installations in 2025 alone. The UK starts from a larger base of renters and flat-dwellers and is entering the market with the benefit of watching what worked in Germany.
The government’s target is at least 45 gigawatts of solar capacity by 2030. Getting there will require both continued growth in rooftop installations and a significant contribution from plug-in systems in homes that cannot support a conventional roof array. The two million milestone marks the point where solar went mainstream in the UK. Plug-in solar is the next chapter.