Hurricane Isaac and its aftermath

Don Duplantier walks through his flooded home as water recedes from Hurricane Isaac in Braithwaite, La., Sunday, Sept. 2, 2012. In the foreground is a sign marking the waterline from Hurricane Katrina, but floodwater from Isaac went all the way up to the second floor.

About a quarter of a million customers remained in the dark in Louisiana and Mississippi on Monday, Sept. 3, 2012 - days after Isaac inundated the Gulf Coast with a deluge that still has some low-lying areas under water.

At least seven people were killed in the storm in the U.S. - five in Louisiana and two in Mississippi.

Credit: AP Photo/Gerald Herbert