One cable detached from a substation. Within minutes, 90% of Paraguay went dark. The blackout hit at 3:20 p.m. on Wednesday — the worst possible hour of the worst possible day, with temperatures above 40°C and a heat index reaching 49°C in parts of the Chaco region.
The state power company ANDE confirmed that more than 1.4 million users lost electricity after both 500 kV and 220 kV transmission lines feeding the national grid from the Itaipú Binacional hydroelectric dam went out of service simultaneously.
How one failure became a national blackout
ANDE president Félix Sosa explained the chain of events at a press conference. A conductor detached at the point where a 500 kV line arrives at the Yguazú substation in Alto Paraná department, near the Brazilian border. The incident triggered automatic protections that took both 500 kV lines connecting Itaipú to Yguazú offline.
What followed was a cascade. The protection protocol separated the Itaipú and Yacyretá power feeds, producing a voltage surge that forced the Itaipú right-bank substation to disconnect all remaining lines into Paraguay. The entire supply from the world’s third-largest hydroelectric dam was severed.
A capital without lights, water, or traffic signals
In Asunción, the effects were immediate. Traffic lights across the city shut down, creating gridlock on major avenues under punishing sun. The national water utility ESSAP warned that its treatment and pumping plants — dependent on the electrical grid — could not maintain pressure, threatening supply across the country.
Restoration began at 3:50 p.m. from substations fed by Yacyretá. By 4:20 p.m., the critical 500 kV line to Villa Hayes was back online, restoring the metropolitan area. ANDE reported 100% service restored by 6:13 p.m., though some neighborhoods experienced intermittent outages for several hours afterward.
A structural vulnerability
Itaipú Binacional issued a separate statement distancing itself, saying the failure was external to its facilities. But the incident exposed a known weakness: Paraguay has no backup high-voltage line of equivalent capacity from Itaipú. A planned connection between Yguazú and Valenzuela is meant to provide redundancy, but it is not yet complete.
Sosa insisted the blackout was a one-off mechanical failure, not a sign of systemic overload. But Paraguay has been actively courting energy-intensive industries like cryptocurrency mining and data centers. Wednesday’s three-hour darkness was a reminder that the country’s grid remains one snapped cable away from collapse. This is part of The Rio Times’ daily coverage of Paraguay affairs and Latin American financial news.
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