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Although the idea is great out of the box thinking, it fails in the thermodynamics and costs involved. Temperature differential is critical for a system generating energy - when the asphalt gets really hot, ambient temperature is also quite high and the temp differential will not exceed 30 C at best. ORC turbines need at least 90C to operate and they do so at fairly low efficiencies. The thermal energy could be harvested for low-grade head applications but still the maintenance of piping and the pumping requirements would be too high compared to dedicated systems on rooftops for example. Much easier is lining of the right of way with PV instead.
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