Baihetan Dam

The Baihetan Dam (simplified Chinese: 白鹤滩大坝; traditional Chinese: 白鶴灘大壩; pinyin: Báihètān Dàbà) is a large hydroelectric dam on the Jinsha River, an upper stretch of the Yangtze River in Sichuan and Yunnan provinces, in southwest China. The dam is a 289-meter-tall double-curvature arch dam with a crest elevation of 827 m, and a width of 72 m at the base and 13 m at the crest.[4] It is considered to be the last large hydropower project in China after a series of projects starting with the Three Gorges Dam.[5] It is also the second largest hydropower plant in the world. The hydropower station is equipped with 16 hydro-generating units that each have a capacity of 1 million kilowatts, making it the largest single-unit capacity globally.[6] All hydro-generating units of the Baihetan hydropower station became fully operational on 20 December 2022.[7]

Baihetan Dam
Baihetan Dam is located in China
Baihetan Dam
Location of Baihetan Dam in China
Official name白鹤滩大坝
Coordinates27°13′07″N 102°54′22″E
Construction began2017
Opening dateFebruary 2021
Construction cost¥220 billion (US$31.58 billion)[1]
Dam and spillways
Type of damdouble-curvature arch dam
ImpoundsJinsha River
Height289 metres (948 ft)[2]
Width (crest)13 metres (43 ft)
Width (base)72 metres (236 ft)
Reservoir
Total capacity17,924,000,000 m3 (14,531,223 acre⋅ft)[3]
Power Station
Turbines16 × 1,000 MW
Installed capacity16,000 MW (operational)
Annual generation60.24 TWh[4]

The dam is also part of the “world’s largest clean energy corridor”, where it joins other mega hydropower projects like the Three Gorges Dam, Wudongde Dam, Xiluodu Dam, and Xiangjiaba Dam, all located on the same river system, to produce and transmit renewable energy from the resource-rich western region to the cities in the east.[8][6] In addition to power generation, the hydropower project also provides flood control, improved navigation, and sand blocking.[9]

History

In June 1959, an on-site survey was conducted at Qiaojia by a domestic expert group and a Czechoslovakian expert group and, consequently, the future site for the Baihetan Power Station was selected. However, the breaking down of relations during the Sino-Soviet split in 1962, resulted in the survey team being withdrawn. The beginning of China’s “Cultural Revolution" also saw the construction plans becoming shelved for many years.[9] It wasn't until August 3, 2017, when construction of the main dam was officially started.[9] An opening ceremony took place on February 5, 2021, and storage of water behind the dam commenced on April 7 of the same year, and by April 24, the water storage elevation of the hydro plant had risen over 720 meters.[9] On 20 December 2022, the formal completion of Baihetan Hydropower Station was achieved when the final hydro-generating unit was connected to the grid and began producing power.[7]

Power generation

The facility generates power by utilizing 16 turbines, each with a generating capacity of 1.0 GW, taking the generating capacity to 16,000 MW.[10] In terms of generating capacity, it is the second largest hydroelectric power plant in the world, after the Three Gorges Dam.[11] It is estimated to generate 62.44 billion kilowatt-hour (kWh) annually and will save about 90.45 million tons of coal per year and consequently reduce annual carbon emissions by 248.4 million tonnes.[7]

Construction

Surveying of the dam site was done in 1992.[12] In 2008, the original plan for the construction of Baihetan Hydropower Station, was formally started. In December 2008, the Baihetan site began construction.[9] The dam was originally scheduled to be constructed between 2009 and 2018.[13] The Jinsha River became officially closed on November 2014.[9] Actual construction started on August 3, 2017.[14]

The manufacturing of the first water guiding mechanism in the Baihetan Hydro-generator units was completed in Harbin, where it both passed inspection and was awarded approval on October 27, 2018. The first 1,000 MW turbine runner was completed at Dongfang Electric’s Baihetan Runner Processing Plant on January 12, 2019.[9]

The reservoir first started storing water on 7 April 2021, and by 24 April, the water storage elevation of the power station had risen over 720 metres.[9] The hydropower station started partial electricity generation in July of the same year. The dam was expected to be fully operational by July 2022.[15] Experts have noted the 4-year construction period as being exceptionally fast for a project of its type.[16]

On June 28, 2021, the Baihetan Dam began generating electricity, when the project's first two turbines started operating.[17] The third turbine followed in July and the fourth in November of the same year.[18] The final generating unit was connected to the grid on 20 December 2022.[19]

Impact

The dam and reservoir have particularly affected upstream Qiaojia County, providing thousands of jobs to local residents, while also requiring resettlement of 32 villages totaling 50,178 residents. Coinciding with the dam construction, the road network was also improved.[20][21]

See also

References
  1. Xie, Echo (28 June 2021). "China turns on world's first giant hydropower turbines". South China Morning Post. Retrieved 6 July 2021.
  2. "Baihetan Hydropower Project, China - World's second biggest power plant".
  3. "Baihetan Hydropower" (in Chinese). Baihetan. Archived from the original on 19 April 2014. Retrieved 23 August 2011.
  4. "Baihetan Hydropower Project". CWE. Archived from the original on 2016-03-02. Retrieved 2016-02-20.
  5. "China's Era of Mega-Dams Is Ending as Solar and Wind Power Rise". Bloomberg.com. 2020-07-03. Retrieved 2021-04-09.
  6. "China builds world's largest clean energy corridor". Azernews.Az. 2022-12-20. Retrieved 2022-12-21.
  7. "China completes construction of second biggest hydro plant". Reuters. 2022-12-20. Retrieved 2022-12-20.
  8. "How China is leading the world in clean energy". The CEO Magazine. Retrieved 2022-12-23.
  9. reduper. "Baihetan Dam". Super Engineering Website. Retrieved 2022-12-21.
  10. "中国东方电气集团有限公司". www.dongfang.com. Archived from the original on 2016-01-26. Retrieved 2016-01-17.
  11. "环保部审批金沙江白鹤滩水电站环境影响报告书（附文） - 北极星水力发电网". news.bjx.com.cn. Retrieved 2020-12-17.
  12. Chen, Houqun; Wu, Shengxin; Dang, Faning (2015-11-10). Seismic Safety of High Arch Dams. Elsevier. ISBN 978-0-12-803627-3.
  13. "A Brief History of Hydropower Development Baihetan" (in Chinese). Baihetan China - Ningxia County Public Information Network. 2 December 2009. Archived from the original on 23 August 2011. Retrieved 20 March 2011.
  14. "巧家政府网-巧家县人民政府门户网站". www.qiaojia.gov.cn. Retrieved 2020-12-17.
  15. "New mega hydropower station to begin operations - China.org.cn". www.china.org.cn. Retrieved 2021-04-09.
  16. "How China built the world's largest arch dam in just four years". South China Morning Post. 2021-03-16. Retrieved 2021-04-09.
  17. "China starts Baihetan hydro project, biggest since Three Gorges". Reuters. 28 June 2021.
  18. "白鹤滩水电站4号机组投运 左岸机组投产发电任务完成过半_四川在线". sichuan.scol.com.cn. Retrieved 2021-12-05.
  19. "China completes construction of second biggest hydro plant". www.businesstimes.com.sg. 20 December 2022. Retrieved 2022-12-20.
  20. "白鹤滩水电站巧家库区5万多移民陆续搬新家". m.yunnan.cn. Retrieved 2022-03-03.
  21. "巧家县：一个因白鹤滩水电站而巨变的县城". www.ztnews.net. Retrieved 2022-03-03.
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