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Cuba experienced a total power failure Friday, according to the U.S. Embassy in Havana.

The embassy said the failure was due to the "collapse of Cuba’s electrical grid."

According to Cuban regime media, the reason for the collapse is under investigation and the timeline to restore power is unknown."

"All U.S. citizens in Cuba or planning to travel to Cuba should be aware and plan accordingly. There are reports of cellphone and internet outages," the embassy added, noting that Cuba’s electrical grid is "increasingly unstable," which has led to "multiple" nationwide power outages in the last few months.

CUBA’S ECONOMIC FREEFALL IS HIDING A NATIONAL SECURITY THREAT JUST MILES FROM FLORIDA: REPORT

The sun sets during a power outage in Havana Friday.  (Adalberto Roque/AFP via Getty Images)

The embassy added, "The electrical system remains vulnerable, and additional regular outages have been occurring more frequently and for longer periods. Scheduled power cuts occur daily, and unscheduled outages persist throughout Cuba."

Cuba’s energy ministry also posted about the power outage on social media.

LEFT-WING INFLUENCER DOWNPLAYS CUBA BLACKOUTS: WORSENING SHORTAGES; 'PEOPLE ARE PARTYING'

A bicycle taxi travels down a street in Havana during an island-wide power outage Friday. (Yami Lage/AFP via Getty Images)

The country’s power system has been struggling because of fuel shortages, the U.S.-imposed oil blockade and crumbling infrastructure.

CUBA’S DICTATORSHIP HAS LONG BEEN A THREAT TO AMERICA. NOW, IT’S FINALLY TEETERING

People sit in a darkened building lobby during a power outage in Havana, Cuba, Friday.  (Ricardo Arduengo/Reuters)

Even when there isn’t a national outage, the country often endures rolling blackouts that leave millions without power.

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The last national outage happened just last month, and Friday's marks the seventh this year.

Brie Stimson is a Los Angeles-based entertainment and breaking news writer for Fox News Digital. 

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