Discover one of the most effcient and cost-effective data centers in the world, built from the ground up to deliver maximum power and reliability. ACC4 is sited on 17 acres of the Ashburn Corporate Center campus in Loudoun County, a Virginia area known as Data Center Alley. With 20 independently backed up computer rooms and 36.4 megawatts of critical power capacity, ACC4 offers a density of 207 watts per sqare foot and takes advantage of eco-friendly reclaimed water for advanced evaporative chilling.