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The Tropenhaus ( ) in Frutigenmarker, Switzerland is a commercial project to use geothermal energy from the Lötschberg rail tunnel for the production of exotic fruit, sturgeon meat and caviar in a tropical greenhouse in the Swiss alpsmarker. In 2007, the project received the Prix Evenir, the Swiss petroleum industry's CHF 50,000 award for sustainable development.

The idea for the greenhouse was born in 2002 when it became apparent that the water continuously flowing out of the world's longest land tunnel could not be diverted to the local river, the Kandermarker, as its warmth of would disrupt the biological rhythm of the endangered trout there. Rather than cool the water artificially, wasting its energy, tunnel engineers founded a start-up company to use the warm water for powering a greenhouse. Construction of the site, which started in May 2008 at a cost of CHF 28 million, is due to be completed at the end of 2009.

A sturgeon farm, one of few in Europe, is the heart of the Tropenhaus. Some 60,000 fish are intended to be grown in 40 outdoor basins. The sturgeons thrive in permanent Siberian summer conditions and are intended to yield 20 tonnes of meat as well as two tonnes of caviar annually. The first sturgeon fillets were sold in local stores in November 2008. The rest of the greenhouses are dedicated to the production of exotic fruit, such as banana, papaya, mango and guava, of which about 10 tons are intended to be grown annually in an area of .

The Tropenhaus is also intended to be a tourist destination, with a visitors' centre, a visitors' trail through the installation, a restaurant, and an exhibition room (paid for by a Bernese energy company) showcasing the project's use of renewable energies and sustainability.

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