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Sign upApril 24, 2025
transN Transports publics neuchâtelois
Buttes
This pilot project on transN's Line 221 near Buttes station (NE) aims to demonstrate that the thousands of kilometers of unused space between railway tracks can be harnessed to generate solar electricity while maintaining passenger train operations. The innovation lies in the removable system design, allowing standard track maintenance to proceed unhindered. Eventually, the electricity produced will be reinjected into the traction power system to help power the trains. By covering half of its 20 km rail network, transN aims to achieve 30% energy independence. The pilot installation includes 48 solar panels (380W each) over 100 linear meters, with an installed capacity of 18 kWp and an estimated annual production of 16,000 kWh, which will be fed into the local DSO grid.
Environmental impact : The 100-metre power plant produces 16,000 kWh/year, reducing CO2 emissions by 3.2 tonnes per year. 99% of the plant is made of recyclable materials: steel, aluminium and glass.
Economic impact : As this is a pilot project, costs are relatively high for an installation of this size. In the middle term, our LCOE target is CHF 0.08, with a payback time of 12 years.
The Sun-Ways solution is designed to take advantage of the unused space between railroad tracks to place removable solar power plants. The technique used is based on a patent and allows for the safe passage of trains and all maintenance work on the railway infrastructure. In contrast to large-scale ground installations, Sun-Ways makes use of already constructed surfaces, without visual or environmental impact. In addition, its mechanized installation process requires little manpower and offers high installation capacities, up to 1,000 m2 per day.
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