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Isn't a large part of electricity production around making things hot to drive turbines?

Airplanes are very heavy so this may not be physically possible, but if you could run coolant pipes under runways, couldn't that captured heat be used in energy production elsewhere?

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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_st...

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