The 10% of their customers currently out of service is the least of their problems.
According to the news reports, many homes have been destroyed. These will not be using power after EDE's lines are back up and EDE restores service. Many businesses will remain closed until repairs are done. Likewise a drop in usage.
Depending on insurance, the impact of repair costs could be severe. New Orleans' utility filed for bankruptcy after the hurricane because of high costs of system restoration.
This will have a substantial long and short term effect on their financial health.