This Workshop brings together all the skills previously sourced from the former Alp Hydro facilities at Chippis and the Grande Dixence workshops of Les Haudères and Z’Mutt under one roof at Martigny. Our colleagues provide all the services needed to maintain and service impellers and turbine wheels (Francis, Pelton, Kaplan), as well as their component parts, whatever their dimensions. This work is carried out in Martigny, but can also be done on site, for example, for polishing a turbine wheel.


  • evaluation of the extent of wear and costing for the repairs.
  • repair procedures for the turbine wheels, turbine parts and pumps.
  • removal of the anti-abrasion coating by sandblasting (if required).
  • resurfacing by MIG/MAG, TIG welding.
  • machining, grinding and polishing or hydraulic profiles according to a template or 3D scan.
  • non-destructive testing using MT and PT procedures.
  • heat treatment for parts up to Ø 3800 mm.
  • static and dynamic balancing.
  • application of anti-abrasion coating (if required).

Specific skills

The experts at HYDRO Exploitation have specialist know-how acquired over many years of experience in operating hydroelectric plants, regardless of their size or output. The company has qualified mechanics, grinding and welding specialists whose skills are verified through the ISO 3834 certification for welding processes.
In order to diversify our activities, we have been certified according to the standard EN15085-2 since 2017, which authorises us to carry out welding repairs on railway equipment.

Client benefits

Our client benefits from the following advantages:

  • a single point of contact for the maintenance and repair of his installations, both in the workshop and on site.
  • quality of welding service guaranteed by the ISO 3834 and EN15085-2 certifications.
  • support and advice from engineers at HYDRO Exploitation for specific services.

Additional services
Virtual Tour of Central Workshops
All manner of resources and expertise under one roof! Join a virtual tour to explore our Central Workshops in Martigny.
Central workshops
Set up at the Martigny site in 2007, the Central Workshops bring together our skills in the servicing of mechanical components. The knowledge we have acquired in the operation of hydroelectric plants qualify us to fulfil our clients’ needs and provide them with tailored solutions.
Central workshops: a new milling centre, unique in French-speaking Switzerland
Commissioning of our new CORREA AXIA 70 milling centre in our machining workshop, to take place soon, will open up a new era for HYDRO Exploitation. This equipment is unique in French-speaking Switzerland. By adding it to our stock of machines we are increasing our versatility and our production capacity.
Machine Shop
Since 2007 and its set-up at the Martigny site, this Workshop has brought together all of our machining skills under one roof. Its sole purpose is to manufacture various parts to support the servicing of mechanical components and spare parts. Thanks to its constant expansion, in particular with the acquisition of the new CORREA machining centre facilitating dimensions unique in the French-speaking part of Switzerland, we are able to fulfil the many demands of different clients.
Non-destructive testing (NDT)
Non-destructive testing (NDT) is used to verify that there are no internal defects, more specifically, cracks, in equipment and machines, without altering them.
Fast and non-destructive analysis of metals and their alloys
The x-ray fluorescence spectrometry (XRF) analysis of metals and their alloys provides an exact breakdown of the different elements contained in a sample without altering it. The procedure can be applied to all clean and accessible surfaces, and even eliminate the need to dismantle the components in certain cases.
Rue de l’Industrie 10, 1951 Sion
HYDRO Exploitation SA
Rue de l’Industrie 10
CP 315 - CH-1951 Sion
Contact us
HYDRO Exploitation SA
Rue de l’Industrie 10 CP 750 - CH-1951 Sion +41 (0)27 328 44 11
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