| Pumped storage
Above and below: The Kühtai II 130MW pumped storage project is planned as the second upper stage of the existing Sellrain- Silz power plant group
to 45-50% by 2030. In addition, the aim is to cover 100% of total electricity consumption (national balance sheet) in 2030 from renewable energy sources. The latest generation of pumped storage power
plants that will be connected to the Austrian grid in the coming years, such as the Tauernmoos PSPP of the Austrian Federal Railways and Kühtai II PSPP of TIWAG, are strengthening this pioneering role. The new technology used enables maximum flexibility and can thus make a valuable contribution to the future energy system. As an example, the Kühtai II project is a 130MW pumped storage project planned as the second upper stage of the existing Sellrain-Silz power plant group. It involves the construction of a new underground power plant, a new Kühtai reservoir, and a water diversion gallery with six water intakes. The new Kühtai reservoir will have a storage volume of 31Mm3
approximately half the size of the
existing reservoir Finstertal. It will be created with the construction of a 113m high and 510m long earth core rockfill dam.
A 25.5km long and 5m diameter transmountain
water diversion tunnel will be constructed to deliver water into the new Kühtai reservoir, via the central and eastern Ötztal valley and the rear section of the Stubaital valley. The underground power plant will be equipped with two reversible spiral Francis pump-turbine units of 65MW of power generation capacity each (90m3 in generation mode). The powerhouse is located at a depth of 174m below the surface and the plant is designed for combined turbine and pump operation. The electricity produced by the Kühtai 2 pumped-
storage facility will be evacuated through an underground 220kV power transmission line and tunnel connecting the existing Kühtai power plant for onward transmission to the grid.
Sweden Vattenfall has started a feasibility study where the
possibility of restoring Juktan’s pumped storage power plant is being investigated. As part of the feasibility
www.waterpowermagazine.com | July 2022 | 19
study, AFRY’s role will be to investigate the technology areas of the existing units, civil work, electricity and permits.
Juktan’s power plant is located between the
Storjuktan and Storuman lakes in the upper part of the Ume River, 20km north of Storuman municipality. This power plant was the first large, pumped storage plant in Sweden and also the largest pumped storage power plant in operation from 1979 to 1996 with a storage capacity of ~30GWh. An unusual advantage of Juktan’s reservoir design is that you can pump water from Storjuktan-to-Blaiksjön with a lower potential f
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