Miaowei Hydropower Station in Yunlong County, Dali

Miao Wei Hydropower Station（苗尾水电站） is located in Shuijing Village, Jiu Zhou Town, Yunlong County, Dali Bai Autonomous Prefecture, Yunnan Province. It is the most downstream cascade station in the “one reservoir and seven levels” development plan of the upper reaches of the Lancang River, connected to the upper Da Hua Qiao Hydropower Station and the lower Gong Guo Qiao Hydropower Station. Below is a detailed introduction:

Geographic Location

  • Location: The station is located in Shuijing Village, Jiu Zhou Town, Yunlong County, Dali Bai Autonomous Prefecture, Yunnan Province, in the Lancang River Valley area of the Hengduan Mountains.
  • Basin Position: In the “one reservoir and seven levels” development plan of the upper reaches of the Lancang River, Miao Wei Hydropower Station is the seventh level station and the most downstream cascade station.

Project Scale

  • Hub Composition: The hub mainly consists of a gravel core rockfill dam, a left bank spillway, a flushing and emptying cave, a water diversion and power generation system, and a ground power station.
  • Dam Type and Dimensions: The top elevation of the gravel core rockfill dam is 1414.80 meters, the top length is 576.68 meters, and the maximum dam height is 139.8 meters.
  • Reservoir Capacity: The reservoir has a normal water storage level of 1408 meters, a total storage capacity of 660 million cubic meters, and a regulating storage capacity of 159 million cubic meters, with weekly regulation performance.

Installed Capacity

  • Installation Scale: The station is equipped with four vertical Francis turbine generator units with a single-unit capacity of 350,000 kilowatts, with a total installed capacity of 1.4 million kilowatts.
  • Power Generation Benefits: The average annual power generation is about 5.999 billion kilowatt-hours, and after the regulation of the Gu Shui Reservoir, it is over 7 billion kilowatt-hours.

Irrigation Benefits

After the completion of the Miao Wei Hydropower Station, it can provide 3.303 million cubic meters of irrigation water annually for about 10,000 mu of farmland along the lower reaches of the Lancang River and 436,000 cubic meters of water for human and animal use in the irrigation area each year.

Construction Unit

The Miao Wei Hydropower Station is invested and constructed by Huadian Lancang River Hydropower Co., Ltd.

Construction History

  • Preparation Work: In December 2008, the Miao Wei Hydropower Station obtained the road permit from the National Development and Reform Commission.
  • Commencement of Construction: The riverbed was blocked in early November 2011, the concrete pouring of the power station foundation began in early July 2012, and the installation of the units began in early April 2014.
  • Water Storage and Power Generation: The water was blocked and stored in late April 2015, the first unit was put into operation in late May 2016, and all units were put into operation in late March 2017.

Project Significance

  • Energy Supply: The Miao Wei Hydropower Station is an important power source for “West-to-East Power Transmission” and “Yunnan Power Transmission”. Its completion and operation are of great significance for Yunnan Province to accelerate the cultivation and growth of the electricity pillar industry with hydropower as the mainstay and to achieve green development.
  • Environmental Protection: During the construction of the project, the “three simultaneous” system of soil and water conservation was strictly implemented, and the national soil and water conservation policies were earnestly followed, forming a comprehensive soil and water conservation measures system. It has won the China Power Quality Project Award and the China Installation Project Quality Award (China Installation Star).
  • Regional Development: The construction of the power station has promoted local socio-economic development, improved the infrastructure conditions of transportation and communication in the surrounding areas, provided a large number of employment opportunities for the local area, and increased residents’ income.