Dong Nai Hydropower Company is the unit that manages and operates two Dong Nai 3 and Dong Nai 4 Hydropower Plants, the average annual power output of the two plants is 1.7 billion kWh. Dong Nai 3 Hydropower Reservoir, normal water level/dead water level is 590/570m, is an annual regulating reservoir with a capacity of nearly 1.7 billion m3, the second largest in Dong Nai river basin after Tri lake. An. However, Dong Nai 3 Hydroelectricity Reservoir is located upstream, so it plays an important role in regulating water for Dong Nai 4, Dong Nai 5 and Tri An Hydropower plants and providing water regulation for the regions. downstream.
Dong Nai 3 Hydroelectricity Reservoir is managed and operated by Dong Nai Hydropower Company.
According to the regulations of the Inter-reservoir process on the Dong Nai river basin promulgated by the Prime Minister together with Decision No. 1895/QD – TTg dated December 25, 2019, in the dry season, Dong Nai Hydropower reservoir daily 3 must discharge water for downstream on average about 45 – 50m3/s per day.
Predicting that 2023 will be a dry year, from the end of 2022, Dong Nai Hydropower Company has stored water from Dong Nai 3 Hydropower reservoir to approximately the normal water level of 588.5/590m and closely coordinated with local authorities to optimally exploit water sources to ensure domestic irrigation for downstream areas and ensure electricity supply for the system in the dry season of 2023 (end of June 2023).
The water level of Dong Nai 3 reservoir dropped to near dead water level.
However, due to the influence of El Nino phenomenon, the rainfall is low, leading to very low water return to the lake, the average discharge to the lake in April and May 2023 is 12.5 m3/s (24.18% equal to 24.18%). 50.25m3/s compared to the same period in 2022), and at the same time, due to the high heat on a large scale in recent years, the Company had to increase power generation to meet the system’s electricity demand.
Representatives of Dong Nai Hydropower Company actively work with the People’s Committee of Cat Tien district to meet the irrigation and living needs of the downstream area.
By May 14, 2023, the water level of Dong Nai 3 reservoir is 572.2/570m, the remaining 2.2m is that the lake water level will drop to dead water level, lower than the paint level as specified in the relevant operating procedures. reservoir is 1.7m. The company has actively worked with Cat Tien district, Lam Dong province to make the most of the remaining water to meet the irrigation and living needs of the downstream area while ensuring energy security for the rest of the time. of the dry season in 2023.
