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Hotel uses Tegernsee as an energy source: "Thermal use of lake water" is virtually unknown in Bavaria


The solution is obvious - and yet it is innovative: The Athos company relies on the thermal use of lake water for the energy supply of its new hotel complex.

The solution is obvious - and yet it is innovative: The Athos company relies on the thermal use of lake water for the energy supply of its new hotel complex.

Bad Wiessee – We were talking about an innovative, hitherto unique project.

The Athos company relies on a source that is literally close at hand for the energy supply of its future hotel complex in Bad Wiessee, the Seegut am Tegernsee: heat and cold are to be obtained from the water of Lake Tegernsee.

When the concept was presented at Hotel Leda am Eck on Friday (January 27), those responsible were almost euphoric: it was said that Lake Tegernsee had almost inexhaustible potential as an energy supplier.

Seawater is taken from a suction system

"Thermal use of lake water" is the magic word.

The principle is very simple: the lake water is taken from a depth of around 35 meters via an intake system, fed through pipes to a heat pump and then pumped back into the lake.

This is how heat and cold are generated.

In Switzerland, entire districts are already being supplied with energy from bodies of water

"An ecologically sensible technology," explained Wolfgang Spiegl from the commissioned engineering office Spiegl GmbH and enthused about the many advantages of such a system: The user makes himself independent of fossil fuels, the technology is absolutely environmentally friendly and saves - in Bad Wiessee alone - around 2500 tons CO2 per year.

Disadvantages or risks?

Basically, they don't exist, said Spiegl, referring to the experience from Switzerland, where entire districts are now supplied with energy from water.

With Eduard Schiebelbein, an experienced engineer from the canton of Zurich has therefore been brought on board.

In Freising, too, people are aware that the energy turnaround is necessary - and would like to "progress quickly".

Experts assure: The Tegernsee will not suffer any disadvantages

The experts assured on Friday in unison: The temperature in Tegernsee will not be increased by the technology, no chemicals will be added to the water during the process, and the sensitive flora and fauna have nothing to fear.

The suction speed under water is so low "that no small fish will stick in the colander," said Spiegl and asserted: "Nothing can and will happen to the lake."

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Thermal use of lake water has not yet arrived in Germany

The municipality, the Rosenheim water management office, the castles and lakes administration and also possible skeptics from the fisheries are already involved in the planning - and are now convinced of the concept, it said.

For the local authorities, the topic means new territory: The thermal use of lake water has not yet arrived in Germany.

"And yet," says Spiegl, "the Tegernsee would have enough energy to supply all communities around the lake".

Lines are laid on the bottom of the lake and are not visible from the shore


In practice, it will initially be the 25 buildings of Strüngmanns Seegut that will benefit from the technology.

The lines will be laid on the bottom of the lake and will not be visible from the shore.

The removal and discharge point is being built directly on the lake promenade below the former casino site.

According to those responsible, it will also disappear underground.

The energy for the heat pump is to be generated via PV systems.

Wiesseer municipal council is united behind the project

Wiessee's mayor Robert Kühn (SPD) was delighted at the press conference about the "outstanding project" for the region and reported that the municipal council was also behind it.

"We are pleased that the Athos company has recognized the potential of Bad Wiessee and our Tegernsee." It will have to be discussed whether this type of energy generation in the community or in the valley could be expanded.

"In any case, we thank you for providing the stumbling block for this," says Kühn in the direction of Eric Heppt, who came as the owner's representative for Seegut.

While the application for the use of lake water is now going to the water management office, the excavators are currently in use on the area on the Wiessee lake shore to carry out the soil replacement.

The completion of the hotel complex is still a long way off: 2027 or 2028 should be the time.


You can find more current news from the district of Miesbach and the Tegernsee region at

Source: merkur

All news articles on 2023-01-30

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