Baihetan Hydropower Station

Baihetan Hydropower Station

The Baihetan Hydropower Station is a hydroelectric facility located on the lower reaches of the Jinsha River, at the border between Ningnan County in Sichuan Province and Qiaojia County in Yunnan Province. With a total installed capacity of 16 million kilowatts and an average annual generation of 62.443 billion kilowatt-hours, it is the world’s second-largest hydropower station, surpassed only by the Three Gorges Project.

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Nantong Binjiang Area GIL Utility Tunnel Project

Nantong Binjiang Area GIL Utility Tunnel Project

The GIL utility tunnel project in Nantong’s Binjiang District is part of the district’s infrastructure‑supporting construction program. With a total length of 5.3 kilometers and a total investment of RMB 550 million, the tunnel system is situated along the north side of Yanhe Road and the west side of Changjiang Middle Road, and is being implemented by Nantong Transmission & Transformation Engineering Co., Ltd., a subsidiary of Nantong Power Supply Company. The project reconfigures four existing 220 kV high‑voltage power lines within the Binjiang District from overhead lines to an underground tunnel network, thereby providing a reliable foundation for the area’s long‑term planning and development. The project employs the latest GIL (Gas‑Insulated Metal‑Enclosed Transmission Line) technology in the power‑system sector and represents the longest such tunnel project in China at this voltage level. The total tunnel length is approximately 30 kilometers, with individual sections ranging from a maximum of 2.7 kilometers to a minimum of 2.1 kilometers. As an underground tunnel system, the design accommodates the city’s topography: the tunnels do not run in straight lines but feature numerous bends and gradients. For special terrains such as river crossings, a pipe‑jacking technique is used to lower the tunnel below ground, with each jacked segment measuring about 240 meters and a maximum slope of roughly 10 degrees. In areas with complex geological conditions, large‑angle compensation units are installed, and the project incorporates more than 130 horizontal and vertical turning points. Additionally, nearly 1,000 corrugated pipes have been deployed throughout the system.

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