Imperial Research finds that electric railways could be powered by subsidy free solar!

A new report shows that solar panels connected directly to railways in the UK could meet a significant amount of their electricity demand.

The authors of a report from Imperial College London’s Energy Futures Lab and the climate change charity 10:10 have found that electric railways could be powered by subsidy-free solar power. The team have been investigating the potential to connect solar panels directly to the substations that provide power to the rail system. This system would use custom power electronics and bypass the electricity grid altogether.


The renewable traction power project found that solar arrays and integrated energy storage devices could supply around 10% of the energy needed to power trains on the UK’s DC electrified routes each year. Crucially, the research found that this clean, renewable power could be supplied at a lower cost than electricity supplied via the grid today.

“I believe that decarbonising our transport sector is key to meeting the UK’s climate targets. The renewable Traction Power project demonstrates that we can harness solar to help make this a reality for our train network,” Professor Tim Green, Director of Energy Futures Lab and academic lead on the project, “This project also demonstrates that the best way to tackle many of the issues we face is through collaboration and leveraging expertise from a wide range of partners.”

The biggest opportunity identified in the study is on the commuter rail network south of London. If 200 small solar farms were installed alongside railway lines they could provide 15% of the power needed to run trains on these routes. An analysis by project partners, Community Energy South, indicates that there are actually around 400 sites that could be suitable for solar traction projects in the region.