Paris airport to go green with geothermal energy

Orly Airport, one of the two big airports serving Paris, is to extract geothermal energy from deep underground to slash its heating bills, the facility’s owners said.

Two shafts each 1,700 metres (one mile) deep will be drilled on the airport’s perimeter to access a water table warmed by heat emanating from the Earth’s hot core.

Drawn upwards by natural pressure, the water will emerge at the surface at 74 degrees Celsius (165 degrees Fahrenheit) and then be injected into the airport’s heating system. It will then be pumped back into the ground at a temperature of 45 C (113 F).

Energy Daily