Linth-Limmern Ltd, Linthal Pumped Storage Hydropower plant


The Linthal pumped storage hydropower plant (PSW Limmern) in the canton of Glarus is one of the most important renewable energy development projects in Switzerland. The underground pumped storage plant can pump lake water from Lake Limmern back to Lake Mutt, which is about 600 meters higher, and from there it then flows back through the power station. This system enables electricity to be generated in a controlled way.

The new pumped storage plant has a pumping capacity and turbine output of 1000 megawatts (MW). This increases the output of the Linth-Limmern power stations from 520 MW to 1520 MW. Drees & Sommer supports the client with project management services.


Added value

  • Improvement of the power station output from 520 MW to 1520 MW

Project data


Kraftwerke Linth-Limmern AG / Axpo

Project duration:


Total costs:

around CHF 2,100 million

Pumping capacity / turbine output:

1000 MW

Drop height:


Length of dam:


Individual services

  • Technical overall coordination
  • Consulting and support in project overall management
  • Coordination, integration, communication with all parties involved
  • Schedule planning
  • Early detection of layout and schedule conflicts

Location map