Pumped storage |
to provide 100% of Dubai’s total power capacity from clean energy sources by 2050. This includes all available technologies such as photovoltaic solar panels, Concentrated Solar Power (CSP), and green hydrogen production using renewable energy. Earlier this year, the last tunnel breakthrough was
achieved at the construction site of the Ritom pumped storage project in Switzerland. On February 23, 2022, after almost 12 months of work, the TBM completed the excavation of the inclined shaft, connecting the area where Lake Ritom is located and the downstream area where the powerhouse of the new Ritom power plant has been almost completed. The new adduction system, completely underground,
Above: Voith’s project team inside the Changlongsham power station in China
j revenue streams for investors and our contracted green energy will put downward pressure on electricity prices for the benefit of Queensland households.” Sheila Charlesworth, CEO of Burnett Mary Regional
Group, commented: “We are pleased to be part of this collaborative project that will see a reservoir on the property as part of a pumped hydro facility assist in reaching zero carbon emissions, while also achieving conservation and biodiversity initiatives for our region, and be available to provide emergency water supply for future bushfires.” The project is the first of three similar sized superhybrid projects that Sunshine Hydro and its partners are developing in the Central Queensland Renewable Energy Zone. Together, these will generate a minimum of 660MW of firm green energy which is equivalent to over half of the current output of Gladstone coal-fired power station. In addition, Sunshine Hydro plans to create 100 superhybrid projects globally by 2040.
Projects underway
Construction work is underway on a number of projects across the world. At the 250MW Hatta pumped storage project being built by the Dubai Electricity and Water Authority (DEWA) in Hatta, work is 44% complete, HE Saeed Mohammed Al Tayer, MD & CEO of DEWA announced on a recent visit to the project site. Accompanied by Nasser Lootah, Executive Vice
References
Closed-Loop Pumped Storage Hydropower Resource Assessment for the United States Final Report on HydroWIRES Project D1: Improving Hydropower and PSH Representations in Capacity Expansion Models by Evan Rosenlieb (NREL), Donna Heimiller (NREL), and Stuart Cohen (NREL) May 2022.
www.nrel.gov/docs/ fy22osti/81277.pdf
President of Generation at DEWA; Mansoor Alsuwaidi, Vice President Projects & Engineering (Generation); Khalifa Albedwawi, the Project Manager, and the project’s team, Al Tayer inspected the construction site of the hydroelectric power station and was briefed on the project’s progress. Al Tayer inspected the construction of the power generators and the upper dam. The first 37m-high Roller Compacted Concrete (RCC) wall has been completed at the project’s upper dam. Work is currently underway on the 70m main dam wall. The station will use water in the Hatta Dam and an upper dam being built in the mountain. During the visit, Al Tayer also reviewed the work progress of the 1.2km subterranean tunnel, which connects the two dams. Al Tayer noted that the hydroelectric power plant in Hatta is part of DEWA’s efforts to achieve the vision and directives of His Highness Sheikh Mohammed bin Rashid Al Maktoum, Vice President and Prime Minister of the UAE and Ruler of Dubai, to achieve a comprehensive and sustainable development and diversify the clean and renewable energy sources in Dubai to achieve Dubai Clean Energy Strategy 2050 and Net Zero Carbon Emissions Strategy 2050
12 | July 2022 |
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was excavated starting in 2019 from the bottom of the valley with drill & blast for the first 770m. Then, in March 2021, a 3.2m diameter Tunnel Boring Machine was launched to excavate the 1.4km long inclined shaft, overcoming a difference in height of almost 800m and raising up to a maximum gradient of 90%. The next works include the installation and subsequent grouting of a steel lining within the new underground supply system, through which the water from the Lake Ritom, with a hydraulic head of 840m, will finally reach two 60 MW Pelton turbines that will be installed in the new Ritom SA powerhouse. In addition, thanks to the installation of a 60MW pump, there will be the possibility in the future of pumping water up into the Lake Ritom. The completion of the project and commissioning of the pumped storage hydropower plant is planned for 2025. Ritom is being developed by Ritom SA, a Joint Venture between Swiss Rail SBB and the canton of Ticino. The electricity produced by the plant is of crucial importance for the operation of the rail network by SBB and for supplying power to the Ticino region. In Sweden, a feasibility study is being carried out
to investigate the possibility of restoring the Juktan pumped storage power plant (see p18-20). The study has been started by Vattenfall, with AFRY investigating the technology areas of the existing units, civil work, electricity, and permits. Juktan’s power plant is located between the lakes
Storjuktan and Storuman in the upper part of the Ume River, 20km north of Storuman municipality. The 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 and generate with a higher potential from Blaiksjön-to-Storuman. If Juktan is restored as a pumped storage power
plant, it will be Sweden’s largest project of its kind. The feasibility study is ongoing until mid-2023 and when a decision is made on a return to pump operation, commissioning is expected to be in 2031. In China, the world’s first 600r/min pumped storage unit has been put into commercial operation at China’s 2.1GW Changlongshan station in Anji County, Zhejiang Province. At the beginning of May unit 5, which was provided by Voith Hydro, successfully passed its 15-day trial operation. The station has a rated head of 710m which is among the highest in China. While the new unit’s rated speed of 600 r/min with a capacity of 350MW is also a world’s first for such high-capacity and high-head units. ●
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