Based on the average maximum output has on each month of the entire system to ensure safe operation of power system planning, reducing air conditioning load power system, will allocate power output allowed Consumption for Electric Power Corporation. Giving priority to the capital Hanoi and Ho Chi Minh; priority power-political events and social importance and place in unit production plays an important role in economic growth, especially units produced for exporting, etc.

In addition, EVN will regulate power by reducing rotational principle to avoid prolonged in a region.

Calculated by the EVN, to ensure operating system safe from major incidents caused widespread blackouts, power production has a maximum average on the whole system in April, 5 and 6 years This amounted to just 270, 275 and 285 million kWh per day. Thus, the power shortage of the national electricity system can be up to 10-15 million kWh / day.