Emergency Operation of North–South Transit Line


Due to unsanctioned electric power consumption by the power system of Uzbekistan, the North–South transit line of the Kazakhstan Unified Power System (UPS) was de-energized three times within yesterday. The power surge ranged between 400 and 700 MW.

Transmission via the North–South transit line was quickly restored, and parallel operation was ensured, by the prompt actions (within 30 minutes) of KEGOC personnel. Emergency control automation ensured that the generation level of the power plants was maintained, thus protecting consumers in the southern regions of Kazakhstan against a blackout.

Isolation of the southern part of the Kazakhstan UPS from the Integrated Power System of Central Asia (IPS) was accompanied by short-term power supply shortages to consumers in Kazakhstan.

As previously reported, after the autumn–winter season started, unsanctioned and unplanned power and capacity consumption from the Kazakhstan UPS by the power system of Uzbekistan has been registered. As of 20 December, the unsanctioned power consumption amounted to 215 million kWh. The North–South transit line (transmission capacity 1350 MW) suffers extremely high loads, which cause actuation of the emergency automation up to 50 times a day.

Uzbekistan breaches the intergovernmental agreements on parallel operation, resulting in diversion of the net power flow at the border of the UPS of Kazakhstan and the UPS of Russia, thereby inflicting commercial losses on KEGOC.

Multiple appeals, including letters from the Kazakhstan Ministry of Industry and New Technologies to the management of the Uzbekenergo SJSC, have gone unanswered. Taking into account the necessity to ensure the operation and the stable power supply to Kazakhstani consumers, the System Operator recommends isolated operation of the systems.