All hydroelectric reservoirs drain dead water level

Hydroelectric reservoirs across the country have escaped the dead water level, but some such as Son La and Lai Chau have not yet generated electricity again because they need to store water to serve the peak of the hot season.

Vietnam Electricity Group (EVN) said that on the afternoon of June 20, the water level of Lai Chau hydropower reservoir was 282 m, 17 m higher than the dead water level; Son La reservoir was 179 m, 4 m higher; Ban Chat reservoir was 438 m, 7 m higher; Tuyen Quang reservoir was 96 m, 6 m higher. Lakes such as Thac Ba, Huoi Quang, Ban Ve, and Tri An also exceeded the dead water level by 0.5 to 3 m.

According to the representative of the management unit of the two hydropower plants Lai Chau and Son La, the current water level is enough to generate electricity again. However, the Lai Chau hydropower plant, with a capacity of 1,200 MW, can only operate all three generators for nearly 90 hours before reaching the dead water level. The Son La hydropower plant, with a capacity of 2,400 MW, can maintain for more than 50 hours. Therefore, the two hydropower plants will still stop operating to store water to serve the upcoming hot days.

Many other hydropower plants are also not operating such as Tuyen Quang, Huoi Quang, Ban Chat, Ban Ve, Song Tranh 2, Dong Nai 4, Dong Nai 3.

The water level in the lakes rose because the hydropower plants stopped operating and the North often had moderate and heavy rains in recent days. Particularly from last night to 7am on June 20, the meteorological agency recorded many places with rain over 60mm such as: Nam Loong (Lai Chau) 86mm, Ta Leng (Lai Chau) nearly 70mm, Quan Ba ​​(Ha Giang) nearly 65mm.

Water level of Lai Chau hydroelectric reservoir at 3:00 p.m. on June 20. Photo: GC

Heavy rains have increased the water flow into the hydroelectric reservoir. According to EVN, the water flow into Lai Chau reservoir is currently nearly 950 m3/s, nearly 19 times higher than the lowest point at 5:00 p.m. on June 8 (50 m3/s). This figure is more than 2 times at Son La hydroelectric plant, and nearly 3 times at Ban Chat. Only Thac Ba hydroelectric plant has a water flow of 0.

The National Center for Hydro-Meteorological Forecasting said that from now until the end of June, the heat wave will continue, with rainfall in the Northwest, Northeast, Northern Delta and North Central regions generally being 10-20% higher than the average of many years, while other places will be 10-30% lower. The peak of El Nino may occur from November 2023 to January 2024.

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