Puerto Rico's Blackout Is Now the Worst in U.S. History

Photo: AP

It’s been 36 days since Hurricane Maria ravaged Puerto Rico. Yet 74% of the island’s 3.4 million residents still don’t have power.

According to a new analysis, this is now “a blackout without rival” in U.S. history. The island, along with the U.S. Virgin Islands, has lost a staggering 1.25 billion hours of electrical service, furthering “enormous suffering.”


“We’ve combed through the historical record looking for a power outage of this scale and duration anywhere in the U.S. and can find none,” analysts Trevor Houser and Peter Marsters wrote in their analysis for the Rhodium Group. “Based on available data, we believe Hurricane Maria has caused the largest blackout in American history.”

The 1.25 billion hours lost is more than double the hours lost due to Hurricane Katrina and 473 million more hours lost due to Hurricane Sandy. Hurricane Georges, which hit Puerto Rico, the U.S. Virgin Islands and the Gulf Coast in 1998, is the only other event in U.S. history to cause more than 1 billion hours in lost power.

Image: The Rhodium Group

“Hurricanes are already the leading cause of power outages in the U.S. by a wide margin,” the analysts wrote. “That will likely grow as the climate changes.”


Another hurricane this year also made the list, with Irma being the fourth largest blackout in American history owing to huge power outages in Florida and Georgia.

But what’s happening in Puerto Rico is in a class of its own. The storm destroyed the entire electrical grid that was already shaky at best.


Puerto Rico’s Governor Ricardo Rossello has set a goal of restoring power to 95% of the island by December 15, but the U.S. Army Corps of Engineers expects that won’t happen until January or February. Even under Rossello’s better-case scenario, the island—along with the U.S. Virgin Islands, which is facing a largely similar situation while getting much less attention—could rack up 2 billion hours in lost power according the analysis.

The widespread power outage means things we take for granted like lights, refrigeration and air conditioning become luxuries. Doctors have been forced to operate by cell phone light. The longer the power stays out, the longer it takes for stores to reopen and people to return to work.


Houser authored a New York Times piece with University of California, Berkeley economist Solomon Hsiang in the wake of the storm warning that Maria could lop 21% off of Puerto Rican’s incomes over the next 15 years.

Getting electricity restored is priority number one to avert a worsening humanitarian crisis. But the future of climate change-intensified storms means the grid will have to look different than it did before Maria. There are signs that’s already happening.


The lessons Puerto Rico is learning are ones other parts of the U.S., as well as other Caribbean nations, would be wise to heed because the problem of hurricane-caused blackouts isn’t going to go away. In fact, it’s probably going to get worse.

Managing editor, Earther

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