A lot of Virginia and North Carolina's power supplied by Dominion power comes from other cheap sources like nuclear and natural gas...Dominon's full list of power generataing stations:
The North Anna Nuclear Power Station is about 40-50 miles from Ashburn, VA home to data centers for Amazon, Google, Verizon, and AOL.
All of these DCs have complicated sets of diesel generators (even if Amazon's took it's DC down during maintenance). I'd be most worried if the availability of diesel became scarce. When I worked at a big DC, a transfer switch broke that disconnected a room from the Dominion feed. Batteries took over and the generators came online seamlessly. The room ran exclusively on redundant generators for 90 days and each had to be serviced every 30 days days of use. No down time. Many of these even move exclusively to generator power on high demand days at the request of Dominion.
Hurricanes that have struck the Northern Virginia area have generally degraded to tropical storm strength. Isabel, now almost 9 years ago was a 3 or 4 as it came ashore at the NC/VA border and was a TS and nearly a TD by the time the eye moved through DC Metro. Most of the power loss was residential in nature from downed trees (I lost mine for 6.5--worse than the recent derecho). There are few trees around them and they have underground feeds.