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The world's first city hotel with a zero-energy balance
Boutiquehotel Stadthalle in Vienna is the world’s first city hotel with a zero-energy balance. Sun-facing walls are covered with solar panels and interior walls covered with green ivy. In addition, they water their plants and flush their toilets with their own well water.
https://www.hotelstadthalle.at/en/sustainability/zero-energy-balanc…
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