And with hundreds of thousands of customers still out on Sunday night, there might be some government workers who find the lights won't be on at their place of work today.
"There may be isolated instances in which federal buildings will still be without power on Monday," an OPM statement said.
"Therefore, you may wish to check with your agency or your supervisor concerning the status of your workplace."
Because Irene slid by the Washington area, mass transit here in D.C. did not shut down as in New Jersey, New York and Connecticut, meaning Monday's commute hopefully won't be much different than a normal day.
President Obama is back at the White House for this work week. He cut short his vacation in Martha's Vineyard by a day because of Irene.
The Congress though is off for another week. Lawmakers aren't due back at the Capitol until after Labor Day, which is next Monday.