en.Wedoany.com Reported - The pumped storage power station project in Shuangpai Tianzishan, Hunan, is accelerating its construction, with tunnel excavation, camp construction, and main works progressing in an orderly manner across various sections. This project is a key energy initiative under China's 14th Five-Year Plan, with a total investment of approximately 9 billion yuan and an installed capacity of 1.4 million kilowatts. Once completed, it will generate up to 1.521 billion kilowatt-hours annually, effectively optimizing the province's energy structure and enhancing grid peak-shaving capabilities.
At the project site in Majiang Town, Shuangpai County, construction of the core No. 2 tunnel is progressing smoothly. This tunnel, with a total length of 2.9 kilometers, adopts a "seven"-shaped layout design, a minimum curve radius of 255 meters, and is excavated from both ends. The No. 2 tunnel, along with the previously completed No. 1 tunnel, serves as a key transportation artery for the power station, connecting the upper and lower reservoirs and pump houses, primarily handling personnel access, material transport, and large equipment relocation. Since mobilization in July last year, the site has deployed an average of over 180 workers daily. Currently, tunnel excavation has completed 80% of the total work, with breakthrough expected by the end of August this year and road access conditions by November, providing traffic support for large-scale construction in the main reservoir area.
Zhang Ke, Deputy Chief Engineer of the Shuangpai Tianzishan Tunnel Project of China Railway 17th Bureau, stated that previously, main reservoir mucking and mechanical transport required detours of 4 to 6 kilometers around the mountain, posing safety risks. The No. 2 tunnel, with a maximum longitudinal slope of only 5.9%, significantly improves traffic safety. Once completed, it will shorten transport distances, save construction time, and resolve detour safety issues.
According to Xu Yuanqiang, Chief Engineer of the Shuangpai Tianzishan Owner Camp Project of China Construction Second Engineering Bureau, the project completed the topping-out of all main structures in February 2026. Currently, Buildings 1, 2, and 3 are undergoing secondary structure and decoration work, with full operational use expected by the end of 2026, meeting the office, accommodation, and meeting needs of the owner, design, construction, and supervision parties.
Once the power station is completed and operational, it will generate 1.521 billion kilowatt-hours annually, facilitating the efficient integration of new energy sources such as wind and solar power, and holding strategic significance for building a new power system. Currently, the project's construction power supply works have been completed, and the two main works—upper and lower dam construction and the underground powerhouse water conveyance system—have all commenced construction, with tasks progressing steadily across all sections.
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