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Owner ALPIC Netz AG, Gösgen
Design Otto+Partner AG, Liestal/BL
Engineering Rapp Infra AG, Basel
Construction Spaini Bau AG, Basel
Waterproofing Drytech Basel, Arisdorf
Drytech Tank 1,786 m²
UNDERGROUND POWER STATION FROLOO, THERWIL / The sound that you can’t hear anymore is the sound of energy. For years, the inhabitants of Therwil, in the Canton of Basel, associated the concept of energy to annoying hums and the deafening roar that accompanied the ignition of the power station’s transformers in the open air.

This year, the power station – with its 4 transformers each one 300 tons, the switching plant and control units, the distribution block – has been transferred to a partially underground reinforced cement structure, which has completely silenced it.

Instead of noise there is silence. Instead of an old open air plant there is a park for the inhabitants of Therwil. After dismantling the existing plant, work was started to restore the area, starting with planting of the new green space for the public.

The power station – which provides 80% of the city of Basel’s electricity needs – was waterproofed with the Drytech White Tank System and Drytech Engineering offered consultancy on the waterproofing during the structure’s design phase.


Drytech® is the leading expert on waterproofing in groundwater for architects, engineers, building firms, estate agents and public agencies.

We have been specializing exclusively in waterproof structures and restoration activities since 1963, working directly on building sites throughout Europe.


Drytech International
+41 91 960 23 49