Cause of massive European power outage unclear as full service returns

The origin of the monolithic powerfulness outage that wreaked havoc successful Spain and Portugal remains a enigma Tuesday arsenic work was restored to the Iberian Peninsula. 

By 7 a.m. section time, much than 99% of vigor request successful Spain had been restored, the country's energy relation Red Eléctrica said. Portuguese grid relation REN said Tuesday greeting each the 89 powerfulness substations had been backmost online since precocious past nighttime and powerfulness had been restored to each 6.4 cardinal customers. 

"We person ne'er had a implicit illness of the system," Spanish Prime Minister Pedro Sánchez said successful a televised code Monday night.  

Emergency workers successful Spain said they had rescued immoderate 35,000 passengers connected Monday who were stranded on railways and successful underground tunnels. 

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A car drives down an unlit thoroughfare successful Lisbon, Portugal, during a nationwide powerfulness outage connected Monday, April 28. (AP/Armando Franca)

Video that aired connected Spanish tv showed radical evacuating metro stations successful Madrid, and bare stations with trains stopped successful Barcelona. Spain’s parliament was besides near successful the dark, nationalist broadcaster RTVE reported.  

The ATP Tour said play astatine the Madrid Open tennis tourney was suspended for the time owed to the powerfulness outage.  

In Portugal, respective Lisbon subway cars were evacuated, courts stopped moving and ATMs and physics outgo systems were affected. Traffic lights successful Lisbon besides stopped moving during the outage. 

REN, Portugal's grid operator, described the incidental Monday arsenic a "rare atmospheric phenomenon." 

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People hold connected a level arsenic metro operations resume partially successful Madrid, Spain, connected Tuesday, April 29, pursuing the nationwide powerfulness outage.  (Reuters/Violeta Santos Moura)

"Due to utmost somesthesia variations successful the interior of Spain, determination were anomalous oscillations successful the precise high-voltage lines, a improvement known arsenic induced atmospheric vibration," it was quoted arsenic saying. "These oscillations caused synchronization failures betwixt the electrical systems, starring to successive disturbances crossed the interconnected European network." 

However, connected Tuesday, Spain’s meteorological bureau AEMET said that it had not detected immoderate "unusual meteorological oregon atmospheric phenomena" Monday and nary abrupt somesthesia fluctuations were recorded astatine their upwind stations. 

Eduardo Prieto, Red Eléctrica’s main of operations, said the instability successful the powerfulness grid caused the Spanish and French energy interconnection done the Pyrenees mountains to split, starring to a nonaccomplishment connected the Spanish side, according to Reuters. The quality bureau reported that immoderate parts of France suffered little powerfulness outages connected Monday arsenic well. 

People slumber successful a sports installation designated for radical who were stuck astatine a bid presumption successful Barcelona, Spain, connected Tuesday, April 29. (Reuters/Bruna Casas)

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Authorities were inactive investigating what happened connected Tuesday. 

The Associated Press contributed to this report.