Energies Media
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The strip of ground between two railway rails is dead space.
Every line on earth has it, and on every line it holds gravel and nothing else.
On one regional line in western Switzerland that strip holds dark blue glass instead.
A train comes through, the wheels pass a few inches above it, and the glass is fine.
So how does a flat panel at boot level survive that, and why is it not filthy?
Start with the harder problem, which is not the weight.
Track has to stay serviceable. Ballast gets tamped, rail heads get ground, sleepers get pulled and swapped, and none of that works if something permanent is sitting in the gauge.
So the modules are not permanent. They come in units of three panels across roughly 20 feet, and a crew lifts a unit out in about ten minutes.
A purpose built rail machine lays them the same way, running along the track and rolling the run out like carpet at up to a thousand square yards in a day.
Then the dirt. A panel lying flat at ground level beside a ballast bed should soil badly and lose output within weeks.
It does not, because a train moving at speed drags a pressure wave in front of it and a turbulent wake behind, and that airflow sweeps the surface every time one goes by.
The traffic that looks like the threat is doing the cleaning. Where more is needed, cylindrical brushes ride on the back of a train.
The installation covers about 328 feet of a line in the Val de Travers, canton of Neuchâtel.
There are 48 modules rated at 380 watts each, which comes to 18 kilowatts.
They lie dead flat, facing straight up.
Nobody picked that angle. It is the only orientation the gauge allows, and at a Swiss latitude it gives away yield that a tilted rack would keep.
Rail wheels clear the surface by inches, and the one worry that would have ended the trial early was glare in a driver’s eyes.
Locomotive crews have not reported a single dazzle incident.
The plant was inaugurated on 24 April 2025 and began feeding power on 20 May.
In the twelve months after that it generated more than 16,000 kilowatt hours, which is three or four households for a year.
More than 11,000 trains ran over it in the same period.
The line operator reports no interference with track maintenance and no damage to the infrastructure underneath.
Switzerland’s transport regulator set the pilot at three years and attached continuous measurement to it, along with supervised tests of pulling the modules out and putting them back.
The pilot cost about 686,000 dollars.
Eighteen kilowatts making 16,000 kilowatt hours is roughly 890 hours of full output a year, which is respectable for glass lying flat and well short of a tilted rack.
Against the build cost it works out near 38,000 dollars a kilowatt.
American utility scale ground mount runs somewhere between 1,100 and 1,400 dollars a kilowatt.
That comparison is unfair and worth making anyway. The pilot price carries a one off machine and the engineering behind it, not a repeatable unit cost, but nothing in the results yet shows where the repeatable number lands.
There is a second ceiling. With the present gear the collected power only travels about 1,640 feet along the track before voltage becomes the binding constraint.
The flat angle is the part that hardware could fix, and work on cells that reorient themselves such as kirigami cells points at where that goes.
The regulator’s own one year assessment is the source for the operating figures.
The appeal is not the cell. It is the ground.
A railway corridor is already owned, already fenced, already graded and already carries a grid connection into every station on the line.
No new land is acquired and no new right of way is argued over, which is the same logic that put 164,000 floating solar panels onto water instead of a field.
Switzerland counts about 3,300 miles of usable track, which on paper is a billion kilowatt hours a year, near 2 percent of national consumption.
The long term aim is to feed the traction current directly, so the generation lands in the hours the trains are running.
France signed a technical cooperation on it in February, Italy is in discussions, South Korea has approved pilots and an Indonesian company has come asking.
France is worth noting twice, because it built a solar road, watched it fail and tore it up. The approval record shows how differently this one was handled.
Hugo is an engineer with strong technical expertise and deep knowledge of the space industry. Multilingual from an early age, his writing combines technical clarity with a strong interest in science and energy.
Hugo is an engineer with strong technical expertise and deep knowledge of the space industry. Multilingual from an early age, his writing combines technical clarity with a strong interest in science and energy.
Hugo is an engineer with strong technical expertise and deep knowledge of the space industry. Multilingual from an early age, his writing combines technical clarity with a strong interest in science and energy.

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