Central Asian power grid failure sparks widespread blackout

A cascading power failure on August 14 plunged several regions of Kazakhstan, Kyrgyzstan, Uzbekistan, and Tajikistan into darkness. The incident began around 2:30 PM local time when two hydroelectric generators at Kyrgyzstan's Toktogul HPP shut down. This triggered an overload in the North–East–South transit corridor, causing the Southern Zone of Kazakhstan's Unified Power System to separate.

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The most powerful energy flows between regions and countries are transmitted via 500-kilovolt lines. Generators in different states must operate in a single rhythm, maintaining a frequency of approximately 50 Hz.

The consequences were immediate and widespread. In Almaty, Kazakhstan's largest city, traffic lights failed, mobile networks faltered, shops closed, and roads became gridlocked. The city's metro system halted, forcing the evacuation of passengers. In Shymkent, over 38,000 residential and nearly 5,000 commercial consumers lost power. The Zhetysu region also experienced significant disruptions, with three major transmission lines shutting down and power outages affecting Taldykorgan and surrounding districts, along with internet and mobile services.

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If a small deficit occurs in one country, neighboring power systems automatically help compensate for it. Countries do not need to maintain massive individual reserves for rare emergencies.

Energy expert Asset Nauryzbayev, former head of Kazakhstan's system operator KEGOC, explained that the interconnected power systems of Central Asia, a legacy of the Soviet era, operate synchronously. While this interconnection usually benefits all participants by allowing neighboring systems to compensate for deficits, it also means that a major disturbance in one country can rapidly spread. "The larger the power system, the more reliable it is, as it has access to the reserves and generators of neighboring countries," Nauryzbayev noted. However, he added, a sudden shutdown of large power units can cause frequency to drop and energy to rush toward the deficit point through available lines in fractions of a second, overwhelming dispatchers' ability to react.

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The larger the power system, the more reliable it is, as it has access to the reserves and generators of neighboring countries.