Specifically, the flow to reservoirs in the Northern and North Central regions increased slightly; the South Central Coast, Central Highlands, and Southeast regions also fluctuated slightly. Meanwhile, the flow in some small river and stream basins in the Northern region of Lai Chau, Lao Cai, and Ha Giang provinces increased rapidly.
This has helped the water level of hydropower reservoirs in the Northern, North Central and Southeastern regions increase slightly, although it is still at a low level. Meanwhile, in the South Central Coast and Central Highlands regions, the water level of reservoirs is within the minimum water level range according to the operating procedures.
Hoa Binh Hydropower Reservoir in October 2019. (Photo: VnExpress)
According to the Department of Environmental Safety, the amount of water flowing into the reservoir is mainly to regulate the water flow to ensure minimum flow, hydroelectric plants operate to generate electricity using the water flow, plants in the Northern and North Central regions generate electricity at a moderate level with low water column and capacity to ensure safety for the generator during operation, it is difficult to meet the electricity generation according to the reservoir operation process at this time.
However, the water level in many lakes in the Northern region has exceeded the dead water level (Thac Ba Lake is close to the dead water level). For example:
- Lai Chau Lake: 272.83m/265m (lake water level/dead water level)
- Son La Lake: 176.72/175m
- Hoa Binh Lake: 102.75/80m (minimum water level: 81.9 m)
- Thac Ba Lake: 45.91/46 m (minimum regulation: 46.5 m)
- Tuyen Quang Lake: 93.11/90m (minimum requirement: 90.7m)
- Ban Chat Lake: 432.78m/431m.
Some lakes near dead water level include: Son La, Thac Ba, Ban Chat, Ban Ve, Hua Na, Thac Mo.
Some hydropower plants generate electricity at low capacity and water column: Son La, Lai Chau, Huoi Quang, Ban Chat, Thac Ba, Tuyen Quang, Hua Na, Trung Son, Thac Mo.
Meanwhile, in the North Central, Southeast, South Central Coast and Central Highlands regions, hydroelectric reservoirs have low inflows, fluctuating slightly compared to yesterday.
It is forecasted that in the next 24 hours, water flow to the lake will continue to increase slightly; water levels in the lakes in the Northern, North Central, Central Highlands, and Southeast regions will increase slowly, at a low level.
Yesterday, June 13, many places in the northern mountainous region had rain, contributing to improving the amount of water flowing to hydroelectric reservoirs. Informing VTC News , Mr. Tran Viet Hoa, Director of the Electricity Regulatory Authority (Ministry of Industry and Trade) said that in the border area, the average rainfall was from 16 - 50mm. At Gam River and the starting point of Thao River (Lao Cai area), heavy rain was from 51 - 100mm. In Ha Giang, the rainfall in Vu Quang was measured at over 100mm.
It is forecasted that from June 13 to 16, the average water flow to large reservoirs on the Da River will increase slightly. “ With the improved hydrological situation, along with the recovery of thermal power plants, we hope to contribute to reducing the tension in supplying electricity to the North in the coming days ,” said Mr. Hoa.
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