(CNN) You may have thought the world had run out of superlatives to describe the misery that Hurricane Maria brought to Puerto Rico. Well now, here's another one: second-largest blackout in history.

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. That makes it the second-longest blackout in world history, according to a report from the Rhodium Group, an economic research firm

The only blackout in world history bigger than Puerto Rico's is the one that came after Typhoon Haiyan devastated the Philippines in 2013. About 6.1 billion hours of power were lost after that massive storm.

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. The analysis leaves out war-related destruction of electrical infrastructure.

The worst in US history

Read More