Going green with a difference thats what the Airports Authority of France seems to be telling us. Already admired for the high amount of non-polluting nuclear energy that this country produces for its needs, its now planning to power an airport in Paris (Orly Airport) and a nearby hotel with Geothermal energy.

Call it luck along with green sense that has made the designers realise that hot water springs could power the airport saving an astounding 7,000 tons from the airport's annual carbon dioxide emissions.

The 17.27 million dollar project involves the drilling of two parallel shafts on the airport's perimeter. In order to reach a reservoir of superheated water, each shaft will have to be 1,700 metres (one mile) deep. At that level, heat emanating from the Earth's molten mantle warms the water up to a scalding 74 degrees Celsius (165 degrees Fahrenheit). Natural pressure will force the hot water to the surface, where it circulates through the network of radiator tubes that make up the airport's heating infrastructure.

The system is closed and produces no waste - once the water imparts its heat energy to the airport and has cooled to approximately 45 C (113 F), it's pumped back underground to replace what has been taken out.

Update: I have just been informed, it may not be completely powered but the airport and hotel will draw most of their power requirements from this system
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