Construction of GKI – Gemeinschaftskraftwerk, Martina/Switzerland – Prutz/Austria

A weir approx. 15 metres high will be constructed between Martina (AT) and the Kajetan Bridge near Ovella (CH) to collect water. The water will be directed to the power plant in Prutz through a 22.6 kilometres long underground tunnel. Power will be generated there by two machine units, each consisting of a Francis turbine and a generator. This electricity is fed along a cable to the transformer substation at the neighbouring Kaunertal power plant, which is operated by Tiroler Wasserkraft, and from there it is fed into the national grid. Responsibility within the engineering consortium for planning of the electromechanical equipment.

Main Data

  • 2 Francis turbines each with an output of 52 MW including all auxiliary systems
  • 2 synchro generators each 65 MVA
  • Energy transmission
  • Generator transformers
  • Connection to transmission network
  • MV and LV substations
  • Secondary structures
  • Additional discharge power plant output 2.5 MW at Ovella weir with synchro generator incl. all auxiliary systems and secondary structures
  • EI&C upgrades for all systems


GKI Gemeinschaftskraftwerk Inn GmbH, c/o EKW AG, Zernez / Schweiz


IUB Engineering Ltd in an engineering consortium

Construction period

2006–2011 (project)

Construction costs

CHF 400 million

Scope of services

Pre-project, construction project, detailed planning, tendering