Energy & Resource | July 2026 | 4 min read
⚡ Quick Takeaways
- Sun-Ways says its 100-metre Swiss solar railway pilot has safely operated on an active line in Buttes.
- The trial uses 48 removable photovoltaic panels with a combined capacity of about 18 kWp.
- Electricity from the installation is being supplied to the local power grid.
- More than 11,000 trains reportedly passed over the panels without stability or safety problems.
- The company is exploring wider use in Europe and other markets after the first-year results.
Switzerland’s solar railway trial has moved from an unusual clean-energy experiment to a closely watched infrastructure test. The project places removable solar panels between active railway tracks, allowing trains to pass while the space below them feeds electricity into the local grid.
| 100m Active rail test section |
18 kWp Combined panel capacity |
16,000 kWh First-year output estimate |
How the Swiss Solar Railway Trial Works
The pilot was installed in Buttes, in Switzerland’s Val-de-Travers district, by Swiss start-up Sun-Ways. It covers a 100-metre section of active railway and uses 48 specially designed photovoltaic panels placed between the rails. The panels have a combined capacity of around 18 kWp and are built to sit flat so trains can continue using the line.
The most important design feature is removability. Railway operators must be able to inspect sleepers, repair tracks and carry out safety work without turning a solar project into an obstacle. Sun-Ways says its system allows panels to be lifted when maintenance is required, then reinstalled after the work is finished.
| Why it matters: railway corridors already use long strips of land. If the technology proves safe at scale, it could add clean power without competing for farmland, rooftops or new sites. |
Power Goes Into the Local Grid
For now, electricity generated by the Swiss pilot is being fed into the local power grid. That makes the project a small but practical test of distributed solar generation, where existing infrastructure is used to produce power close to where it is consumed.
Sun-Ways is also studying future systems that could send electricity directly into railway substations or traction networks. That would be a bigger step because rail operators would need to integrate generation with power management, safety systems and service reliability requirements.
The company estimates that one kilometre of equipped railway could produce around 200 MWh of electricity per year. Across Switzerland’s wider rail network, it has suggested that the potential output could reach about one terawatt-hour annually, equal to roughly 2 percent of the country’s electricity consumption.
Safety Concerns and First-Year Performance
Solar panels on active tracks naturally raise questions about vibration, microcracks, glare, fire risk, dirt and emergency access. Railways are highly regulated environments, so even a promising clean-energy idea must prove that it does not interfere with train movement or maintenance.
Sun-Ways says the first-year results have been positive. More than 11,000 trains reportedly passed over the Buttes installation without affecting its stability or safety. The company also says the system required no special maintenance during the period.
To address glare and durability concerns, the panels use anti-reflection filters and are designed to be stronger than standard rooftop modules. Built-in sensors monitor their operation, while cleaning systems, including brushes attached to trains, can help remove dirt from the panel surface.
Key Numbers From the Trial
| Metric | Reported Figure | What It Shows |
| Pilot location | Buttes, Switzerland | Active railway test site |
| Installed section | 100 metres | Limited but real operating corridor |
| Panel count | 48 panels | Small-scale photovoltaic installation |
| Capacity | 18 kWp | Enough for a meaningful infrastructure pilot |
| Estimated first-year output | Around 16,000 kWh | Useful early production data |
| Trains passed | More than 11,000 | Safety and stability test under traffic |
| Potential per kilometre | About 200 MWh a year | Basis for scale-up estimates |
Why Europe Is Watching the Technology
The results have drawn attention because Europe is trying to expand renewable power while also making better use of existing public infrastructure. Railways offer continuous corridors that are already managed, inspected and connected to power systems in many countries.
Sun-Ways has signed a collaboration agreement with an Italian business partner, and the company has said that an Italian pilot may be announced in the coming months. It has also received approval for another installation in South Korea and is discussing potential projects in several other markets, including the Netherlands, China, India and Singapore.
However, wider adoption is not guaranteed. Larger projects will need further technical testing, regulatory approval, maintenance planning and cost assessment. The Swiss result is encouraging, but transport authorities will still want evidence that the system remains safe over longer periods and in harsher weather.
| Bottom line: the Swiss trial does not yet prove that every railway can become a solar plant, but it shows the concept can work on an active line without disrupting train traffic. |
What Comes Next
The next stage is scale. A 100-metre pilot can show whether panels survive traffic and generate useful power, but kilometre-scale projects will test installation speed, cleaning needs, winter performance and long-term economics. If those tests succeed, railway solar could become a practical addition to Europe’s clean-energy mix.
For countries with dense rail networks and limited free land, the idea is attractive: use the space already built into transport corridors and generate electricity without changing the core purpose of the railway. Switzerland’s trial has now given that idea a stronger case for further testing.
Disclaimer: This article is based on reported trial data and company statements available at the time of publication. Large-scale deployment will depend on further testing, regulatory clearance and infrastructure conditions.
