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The technology

The Groner-membrane is an inflatable lining which turns any tunnel into a completely hydraulic smooth waterway reducing energy loss losses dramatically.

The durable membrane is subject to a small inner water pressure and "floats" in the surrounding water. The patented design therefore transfers hydraulic forces instead of containing them.

The result is a reliable and durable lining that substantially increases output with an absolutely marginal environmental impact:

  • Tunnel friction loss: up to 75 % reduction.
  • Installed capacity: may be increased with up to 100 %.
  • Power production: 20 % increase can be achieved. 

New renewable energy with minimum environmental impact.