In terms of the total number of lost hours of electricity, Puerto Rico and the US Virgin Islands are in the midst of the largest blackout in US history, according to a report from an economic research company.

In all, Hurricane Maria has caused a loss of 1.25 billion hours of electricity supply for Americans, according to the analysis from the economic research firm Rhodium Group. That makes it the largest blackout in US history, well ahead of Hurricane Georges in 1998 and Superstorm Sandy in 2012, the group said.

That 1.25 billion number will continue to grow. More than a month after Hurricane Maria knocked out the electric grid on the islands, the vast majority of residents remain without electricity, and the restoration of that power is months away.