According to the latest online updates from the Vietnam Electricity Group (EVN), at Tuyen Quang Hydropower Plant, the inflow to the reservoir at 11:30 am today (September 12) continued to decrease significantly from the previous day, dropping to 2,031 cubic meters per second. The reservoir is currently releasing water at a rate of 2,455.8 cubic meters per second.
This means that within just one day, the inflow has decreased by over 700 cubic meters per second. The plant has also reduced its discharge by 1,904 cubic meters per second compared to the previous day. The water level upstream of the reservoir has slightly decreased over the past 24 hours and is currently at 117.28 meters, with a forecast of a further decrease in the coming hours. The plant has closed 5 out of 8 spillway gates, leaving only 3 gates open as of September 10-11.
“According to the assessment of the competent authorities, Thac Ba Hydropower reservoir is currently safe. The authorities continue to closely monitor the flow trends and are prepared for various flood discharge scenarios and emergency responses (if necessary) to ensure the safety of the project and the downstream area,” said Mr. Nguyen Manh Cuong, Deputy General Director of Thac Ba Hydropower Company, to Tien Phong reporters.
Many localities are deeply flooded. Photo: Van Duc.
Mr. Cuong shared that the situation has improved compared to the previous days, with a reduction of 3 centimeters of water inflow per hour. As of 11:00 am today (September 12), the inflow was 2,294 cubic meters per second, and the discharge was significantly reduced compared to the previous day, dropping to 3,115 cubic meters per second. In terms of volume, the inflow has decreased by 883 cubic meters per second compared to the same period yesterday. The plant has also reduced its discharge by 386 cubic meters per second.
With the continuing decrease in inflow, the water level upstream of the reservoir has dropped by almost half a meter in the past 24 hours, now standing at 59.43 meters. The Thac Ba reservoir is following the directive from the Ministry of Agriculture and Rural Development (MARD) to open 3 out of 3 spillway gates.
“At present, if there is no rain, the water level decreases by 3 centimeters per hour. In the event of heavy rainfall upstream, the inflow will increase, and the water level will drop at a slower rate. The company regularly inspects the auxiliaries, equipment, and spillway structures to ensure safety,” said Mr. Cuong.
At Hoa Binh Hydropower Plant, the inflow has slightly increased compared to yesterday, reaching 2,665 cubic meters per second. The total discharge through the plant is 2,109 cubic meters per second, with an inflow increase of nearly 800 cubic meters per second. Although the inflow has increased rapidly, the plant has significantly reduced its discharge by 1,801 cubic meters per second (on September 11, the discharge was at 3,910 cubic meters per second). The water level upstream of Hoa Binh Lake has risen by half a meter, reaching an elevation of 112.24 meters.
Son La reservoir is also experiencing an inflow of 3,332 cubic meters per second, with a discharge of 2,459 cubic meters per second through the plant. The hydropower plants in the Northwest region, such as Lai Chau, Ban Chat, and Hue Quang, are maintaining discharges of 1,625 cubic meters per second, 311 cubic meters per second, and 468 cubic meters per second, respectively.
The two large hydropower plants in North-Central Vietnam, Trung Son and Ban Ve, are discharging at rates of 1,516 cubic meters per second and 1,245 cubic meters per second, respectively.
According to EVN, as of September 12, the Northern Power Corporation (EVNNPC) has restored 1,393 out of 1,671 medium-voltage lines affected by the storm. Power supply has been restored to nearly 5.3 million out of approximately 6 million affected customers due to the storm and floods (over 88% recovery rate).
To expedite the repair process and restore power as soon as possible, on September 11, the Central Power Corporation dispatched 245 engineers and skilled workers to Quang Ninh Province to support the power grid recovery. This task force consists of specialists from six power companies, including Quang Binh, Quang Tri, Thua Thien Hue, Da Nang, Quang Nam, and Quang Ngai, providing additional assistance to fix the issues promptly.
The hydropower reservoirs that are currently discharging water include Tuyen Quang (3 gates), Ban Chat (1 gate), Hue Quang (1 gate), Thac Ba (3 gates), Trung Son (6 gates), and Ban Ve (6 gates).
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To ensure the safety of the dam, the Minister of Agriculture and Rural Development ordered the opening of the third spillway gate of Thac Ba Hydropower Reservoir. This directive was issued to the Director of Thac Ba Hydropower Joint Stock Company, with the gate opening scheduled for 6 a.m. on September 9th.
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