I’m a fan of geo-thermal energy. It’s almost free, available everywhere, and doesn’t pollute in any way. France likes it too, and is taking advantage of it to power a new airport.
Geothermal power uses water and the Earth’s own internal heat to generate steam, which turns turbines and produces electricity. The only costs are those associated with pumping of the water and hardware.
The airport, the Orly, will open its doors in about three years.