Recently, the lower reservoir of the Hebei Yixian Pumped Storage Power Station, constructed by Sinohydro Bureau 4 Co., Ltd., has been fully completed. At this point, the construction tasks for both the upper and lower reservoirs of the power station have been entirely finished, providing a solid guarantee for achieving the commissioning of the first unit for power generation by the end of the year.

The Hebei Yixian Pumped Storage Power Station is located in Yixian County, Baoding City, Hebei Province, with a total installed capacity of 1,200 MW and a rated head of 354 meters. It is equipped with four vertical-shaft single-stage mixed-flow reversible pump-turbines, each with a unit capacity of 300 MW, and is classified as a Class I large (1) type project. The power station consists of the upper reservoir, water conveyance system, underground powerhouse and switch station, and lower reservoir, among other parts. Sinohydro Bureau 4 Co., Ltd. undertakes the overall construction task of the power station.

As the "energy container" of the power station, the main structures of the lower reservoir include the dam, inlet/outlet, spillway, and flood discharge tunnel, etc. The normal storage level is 271 meters, with a storage capacity of 9.122 million cubic meters. The lower reservoir dam is designed as a concrete face rockfill dam, with a total fill volume of 913,600 cubic meters.

The crest elevation of the main dam of the upper reservoir is 638.5 meters, with a maximum dam height of 90.5 meters, a dam axis length of 458.0 meters, and a crest width of 10.0 meters. For the crucial asphalt impervious face slab works in the upper reservoir, the project management team organized multiple process tests to accurately determine construction parameters, and strictly monitored the asphalt concrete from mixing, transportation, paving, and rolling to inspection, ensuring that every step met high standards to guarantee the overall quality and construction efficiency of the project. In the asphalt concrete slope rolling construction, an integrated equipment system was used for flow-line construction, solving the problems of low safety and reliability, slow progress, and complex coordination in the multi-process construction of various equipment. Its performance is superior to similar process devices at home and abroad, saving 20% of construction time compared with the same period, and the "full reservoir basin asphalt concrete seepage prevention construction" adopted by the power station is the first case in PowerChina.

At present, the construction of the power station has entered the comprehensive sprint stage, and the installation and commissioning of the units are being fully advanced. It is reported that after completion, the power station will supply power to the southern Hebei power grid, undertaking tasks such as peak shaving, valley filling, frequency regulation, phase modulation, and emergency accident reserve in the system. It will play an important role in improving the peak-shaving capacity of the southern Hebei power grid, optimizing the power source structure, and supporting the construction of the smart grid in the Xiong'an New Area.