Low power supply, high demand
On the afternoon of June 7, in Hanoi, the Ministry of Industry and Trade met with the press to inform about the electricity supply situation during this year's dry season.
Mr. Tran Viet Hoa, Director of the Electricity Regulatory Authority (Ministry of Industry and Trade), said that the severe heat and the impact of El Nino occurring in many localities across the country have increased the demand for household electricity, combined with the very low water level in hydroelectric reservoirs, greatly affecting the electricity supply during this year's dry season.
Mr. Tran Viet Hoa informed about electricity supply in the North.
In the Southern and Central regions, electricity supply is guaranteed due to the presence of many power sources. Furthermore, these regions have entered the rainy season, the load has decreased and the water supply to hydroelectric reservoirs has improved.
In the North, with hydropower accounting for a large proportion of 43.6%, negative factors have emerged that affect the ability to ensure adequate electricity supply in the coming time.
According to Mr. Hoa, as for hydropower, by June 6, most of the large hydropower reservoirs in the North had reached the dead water level, including: Lai Chau, Son La, Tuyen Quang, Ban Chat, Hua Na, Thac Ba. Of which, the two hydropower reservoirs of Lai Chau and Son La had to run down below the dead water level. Currently, only Hoa Binh hydropower still has water in the reservoir and can maintain power generation until around June 12-13.
According to calculations, the total unmobilized capacity of hydropower sources is at 5,000 MW and can reach up to 7,000 MW when Hoa Binh hydropower reservoir reaches dead water level. As of June 6, the available capacity of hydropower is 3,110 MW, only reaching 23.7% of the installed capacity.
Regarding thermal power sources, Mr. Hoa affirmed that the coal supply for thermal power plants has been guaranteed. Coal-fired thermal power plants have enough fuel to operate at high capacity.
However, due to hot weather and high temperatures, the units operated at maximum capacity for a long time, leading to equipment failures (mainly steam generator leaks, heater leaks, superheaters, coal crushers, feed pumps, etc.). In addition, many coal-fired thermal power units had long-term failures that could not be resolved (1 unit in Vung Ang, 1 unit in Pha Lai, 1 unit in Cam Pha, 1 unit in Nghi Son 2).
Typically, on June 1, the total capacity that could not be mobilized from coal-fired thermal power plants in the North that had problems and reduced capacity was up to 1,030 MW. Although the coal fuel source for power generation was relatively guaranteed, as of June 6, the coal-fired thermal power source was only able to mobilize 11,934 MW, accounting for 76.6% of the installed capacity.
According to the leader of the Electricity Regulatory Authority, the current capacity of transmitting electricity from the Central region to the North via the 500 kV North-Central line is always at a high limit (maximum limit from 2,500 - 2,700 MW), which is potentially at risk of an incident.
Thus, the total available capacity of the Northern power system (including imported electricity) that can be mobilized to meet the electricity load demand is only 17,500 - 17,900 MW (about 59.2% of the installed capacity). This capacity includes about 2,500 - 2,700 MW transmitted from the South and Central regions to the North (500 kV Nho Quan - Ha Tinh line section). Meanwhile, the demand for electricity in the North can reach 23,500 - 24,000 MW on hot days.
"The Northern power system will have a shortage of about 4,350 MW with an average daily output of about 30.9 million kWh, and the highest day can reach 50.8 million kWh. The Northern power system faces the risk of a capacity shortage at most hours of the day," said Mr. Hoa.
Mr. Hoa also said that in the face of the situation that could affect the safety of the power system, in recent days, Vietnam Electricity Group (EVN) had to reduce load in the North. Specifically, on June 5, the total load reduction was 3,609 MW at 4:30 p.m.; of which the largest industrial load reduction was about 1,423 MW, the largest household load reduction was 1,264 MW.
Information provided by Mr. Tran Viet Hoa explains why widespread power outages and power cuts have occurred in many northern provinces and cities in recent days.
Increase mobilization of thermal power to compensate for hydropower
Regarding the solution to ensure electricity supply for the northern provinces in the coming time, Mr. Tran Viet Hoa said that the Ministry of Industry and Trade has requested EVN to focus on effectively mobilizing all resources.
EVN maintains the readiness of thermal power plants/units, speeds up troubleshooting as quickly as possible; operates the power system reasonably, tries to increase thermal power mobilization to prevent the decline in hydropower water levels; pushes the water levels of large hydropower reservoirs above the dead water level as soon as possible.
In addition, EVN and the Ministry of Industry and Trade will develop flexible scenarios to respond to difficulties in electricity supply to minimize damage to people and businesses; increase the mobilization of renewable energy plants, speed up the progress of putting transitional renewable energy plants into operation (up to now, 18 transitional renewable energy plants with a capacity of 1,115.62 MW have been mobilized, including plants in trial operation and commercial operation - PV).
Especially in June, EVN and the Ministry of Industry and Trade focused on effectively implementing solutions to increase electricity saving.
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