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Georgia Blackout Halts Tbilisi Metro During Hydropower Test

8/6/2026

22 3 Full Breakdown

Summary

Story summary

Georgia suffered a blackout on August 5, 2026 at around 20:10.
State Electrosystem (GSE) said the outage occurred during planned testing of Enguri hydropower plant units, which forced the grid to run in isolation.
The blackout halted the Tbilisi Metro, forcing passengers to exit trains on foot.
GSE said the tests targeted the July 24-25, 2026 outages linked to an Imereti transmission-line fault and a protection-system failure.

History

Historical Context

On August 14 2003 a software alarm failure at FirstEnergy in Ohio triggered tree-contact line trips that cascaded into a blackout affecting about 55 million people across the U.S. and Canada. The outage spurred the U.S.–Canada Power System Outage Task Force, leading to mandatory reliability standards enforced by NERC. Georgia’s 2026 grid loss during an Enguri-hydropower test echoes that same cascade.

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Story summary

Georgia suffered a blackout on August 5, 2026 at around 20:10.
State Electrosystem (GSE) said the outage occurred during planned testing of Enguri hydropower plant units, which forced the grid to run in isolation.
The blackout halted the Tbilisi Metro, forcing passengers to exit trains on foot.
GSE said the tests targeted the July 24-25, 2026 outages linked to an Imereti transmission-line fault and a protection-system failure.

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