Mapped: Virginia data centers’ thousands of backup generators
Loudoun County, Virginia, houses nearly half of the state's 13,500+ data center backup generators, leading to significant noise complaints from residents. These diesel-powered generators contribute to emissions, prompting enforcement actions such as a $2.5 million penalty against Microsoft by Virginia's DEQ for exceeding air permit limits. Additionally, a proposed EPA rule change threatens to eliminate federal requirements for public notification and comment on minor air permits.
Loudoun County, Virginia, a global data center hub, hosts almost half of the state's more than 13,500 data center backup generators, according to a Technical.ly analysis of 195 air permit applications. These diesel-fueled generators are critical for maintaining server uptime during grid outages but contribute to significant noise pollution and air emissions, leading to growing frustration among local residents.
Residents, including Lindsay from Loudoun, have voiced concerns at county meetings about sleep disruption due to constant humming. The environmental impact is substantial, with Virginia's Department of Environmental Quality (DEQ) ordering Microsoft to pay a $2.5 million penalty for exceeding emission limits during a 2025 outage. This fine, the largest of its kind in the state, is slated for air monitoring infrastructure. Amazon, through its subsidiary VADATA, accounts for nearly 40% of generators in Virginia.
The article highlights regulatory complexities, noting that tracking data center permits is challenging due to disparate sources. It also points to a proposed Environmental Protection Agency (EPA) rule that would remove federal requirements for public notification and comment on minor new source review permits, which are commonly filed by data centers, potentially reducing community input on future projects.