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Trains in Switzerland Are Now Running Over Solar Panels in a First-of-Its-Kind Test
(www.zmescience.com)
Everything about energy production and storage.
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You need some serious concrete and/or steel hardware to build a carpark roof that can hold the solar panels without easily being damaged by cars or broken by strong wind, so that massively inflates the costs. If you had a state owned company producing cheap solutions for this it could work though.