Puerto Rico’s  power outage  is now the second-largest blackout on record

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Since the monster storm slammed into the American Caribbean territory in September 2017 and heavily damaged the power grid, more than 3.4 billion hours of electricity have been lost there.

The Rhodium Group analysis largely relies on data on electricity loss provided to the Department of Energy, as well as news reports for storms prior to 2000, according to Trevor Houser, a partner at Rhodium who co-wrote the analysis with Peter Marsters.

“As we started looking at the scale of the blackout and try to put that in historical context, it became clear this was a record-breaking event and worthy of some attention and focus just from an electric standpoint,” Houser said.

Right now, Rhodium estimates power has been restored to 96% of the island, meaning that 53,000 households — between 100,000 and 200,000 people — still don’t have electricity, some seven months after the storm.

Houser and Marsters said their research shows that “making existing electricity supply more resilient to storm-related disruptions in both developed and developing countries is also important, particularly given recent and projected changes in the global climate.”