Yes. You could heat fluid and use it to generate electricity as you can assume the runway is hotter than the ambient air. But if you look at other solar therma

Yes. You could heat fluid and use it to generate electricity as you can assume the runway is hotter than the ambient air. But if you look at other solar thermal power stations [0] you can see that they generally use concentrators to get the working fluid very hot for more efficient operation. So a runway based system probably wouldn't be economical even if it were good reuse of space. 0 - https://en.wikipedia.org/wiki/List_of_solar_thermal_power_stations https://en.wikipedia.org/wiki/List_of_solar_thermal_power_st...