 BWI officials say the power was out for roughly two hours and was restored around 7.30. Officials say they are still trying to figure out what exactly caused the outage. And Baltimore Beltway drivers need to be aware of some major lane closures starting tonight and will continue for the next couple of months. Crews will be closing lanes on parts of the Beltway between Woodlawn and Towson between Sunday and Thursday. But officials say all lanes will be reopened no later than 5 a.m. each morning.