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Kühtai Pumped Hydro Station is part of the Sellrain-Silz power plant group. This group consists of the Finstertal reservoir which is the upper reservoir of the Kühtai Pumped storage hydro power plant. The Kühtai pumped storage hydro power plant has the Längental reservoir as lower reservoir. This lower reservoir is at the same time the upper reservoir of the Sellrain-Silz High head hydropower schmen. Only the Kühtai power plant has pumping capabilities.

Since the Längentals-reservoir is fed with fresh water the PSH Kühtai is an open loop PSH. The Sellrain-Silz power plant is only a high head hydropower scheme.

The Finstertal reservoir is located at an altitude of 2300 meters above sea level and has a capacity of 60 million m³. The dam's embankment is 149 meters high with a crest length of 650 meters, which contains 4.5 million m³ of rock.

The Finstertal reservoir sits at an altitude of 1900 meters above sea level on the southeastern shore of the Längental reservoir. The power plant uses a shaft power design, which means that the components are vertically arranged and the majority of the cylindrical power plant building is located underground. The building has a diameter of 30 meters and a depth of 82 meters. The plant contains two Francis turbines with pump and power generation abilities. Both turbines can process 66m ² of water per second.

The reservoir Längental, often referred to as cache Längental, is located 400 meters below Finstertal reservoir and acts as intermediate storage with 1/20th of Finstertal's storage capacity. There are 13 mountain streams that continuously supply the reservoir. Water can either be pumped back into the Finstertal reservoir via the Kühtai Pumped Hydro Station or the water can flow down stream for electricity production via the Silz power station.

The Silz power plant sits at an altitude of 643 meters above sea level. The power plant contains two Silz Pelton turbines which rotate at 500 revolutions per minute.


Open-loop Pumped Hydro Storage


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