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Power and Energy Directly from Water
Published in Yatish T. Shah, Water for Energy and Fuel Production, 2014
An underground power station can make use of a large natural difference between two waterways such as waterfall or a mountain lake. An underground tunnel can also be constructed to take the water from high reservoir to the power-generating hall built in an underground cavern near the lowest point of the water tunnel and a horizontal water pipe taking the water away to the lower waterway. The size of the hydroelectricity generated by these methods can be large, small [14–16], micro (<100 kW) [17–25], or pico (<5 kW) [26–32] (Zainuddin et al., 2012, pers. comm.). These different levels of hydropower generations are further discussed in Section 13.2.6.
Hydropower and Floods
Published in Saeid Eslamian, Faezeh Eslamian, Flood Handbook, 2022
Sachin Kumar, Aanchal Singh S. Vardhan, Akanksha Singh S. Vardhan, R. K. Saket, D.P. Kothari, Saeid Eslamian
An underground power station is generally used at large facilities and uses a large natural height difference between two waterways, such as a waterfall or mountain lake (Saket, 2013). An underground tunnel is constructed to take water from the high reservoir to the generating hall built in an underground cavern near the lowest point of the water tunnel and a horizontal tailrace taking water away to the lower outlet waterway as shown in Figure 5.15.
Evaluation of in-situ stress state along the shotcrete lined high-pressure headrace tunnel at a complex Himalayan geological condition
Published in Geosystem Engineering, 2021
Chhatra Bahadur Basnet, Krishna Kanta Panthi
The Upper Tamakoshi Hydroelectric Project (UTHP) is located in Dolakha district of Nepal, which is towards North-East from Kathmandu valley (Figure 1). The first phase of the project is in under construction where it is planned to use water only from Tamakoshi River to generate the electricity. While in the second phase, water from Rolwaling Khola will also be added to the intake of Upper Tamakoshi located at Lamabagar. In total the project will have an installed capacity of 456 MW and will exploit 66 m3/sec design discharge and 822 m gross head (Reimer & Bock, 2013). The project consists of different structures such as headworks, headrace tunnel, vertical penstock shafts, underground power station, tailrace and access tunnels (Figure 2(a and b)). From pre-feasibility study in 2001 to date, there have been several changes on the pressurized headrace tunnel alignment of the Upper Tamakoshi Hydroelectric Project, which is discussed in detail by Panthi and Basnet (2017). The pressurized headrace tunnel ends at the top of the upper vertical penstock shaft and is planned to be unlined or shotcrete lined tunnel. Both old and new versions of headrace tunnel alignments are shown in Figure 2.
Sustainability assessment of two Australian hydro megaprojects
Published in Journal of Mega Infrastructure & Sustainable Development, 2019
Glen Currie, John Black, Colin Duffield
In 2017, Snowy Hydro conducted a feasibility study on Snowy 2.0, which demonstrated that a pumped hydro expansion project was both technically and financially feasible. This project would link two existing reservoirs (Tantangara and Talbingo) through underground tunnels and an underground power station with pumping capabilities. Snowy Hydro's independent Board of Directors approved the project's progression early in 2019 with a view to the project commissioning in 2024. In April 2019, the construction contract for Snowy 2.0 was awarded to a joint venture of Salini Impregilo (an Italian company) and Clough (an Australian company). The Snowy 2.0 Environmental Impact Statement that includes a full suite of heritage and social assessments was released in September 2019, and the NSW Government gave planning approval for Snowy 2.0 on 21 May 2020. The Australian Government approved the A$5.1 billion of civil works on 30 June 2020.