Heart of the plant: The Valle di Lei reservoir

IBAKH is participating in Engineering Supervision of Overall Rehabilitation of Hinterrhein Hydro-Power Plants (Gesamterneuerung der Wasserkraftanlagen) in Thusis Region of Canton Graubünden in the Swiss Alps since October 1, 2011. The Kraftwerke HinterRhein AG (KHR), built between 1956 and 1963 at a cost of some CHF 620 million, is a three-level Hydro-Power Plant group. With the Hydro-Power Plants at Ferrera, Bärenburg and Sils, KHR operates the biggest power plant combination in the canton of Graubünden with a total installed capacity of approximately 650 MW – and with the 220/380 kV outdoor switchgear plant in Sils as a key junction in the Swiss and European electricity network.  These power plants have been in operation for more than 40 years.  KHR uses the potential energy of water from 1,931 meters above sea level in the Valle di Lei valley to 667 meters above sea level in Sils. The heart of the plant is the Valle di Lei reservoir, which holds about 200 million m³. The Thusis power plant, constructed between 1966 and 1968, is also included in the plant group. It uses the spike and residue water remaining in the Posterior Rhine.