An on-site power failure at a Vantage Data Centers campus in Sterling, Virginia, led its backup diesel generators to run for nearly a full day during a Code Red air-quality alert.
Here's what to know
At Vantage Data Centers' VA2 campus in Sterling, eight on-site natural-gas turbines supply electricity instead of the electric grid. During a July incident, the turbine plant failed, and dozens of diesel backup generators kicked in under an emergency exemption in the facility's air permit, according to Kaizen Executive.
The caption on the original Instagram post stated, "A Vantage Data Centers facility in Sterling, Virginia, ran backup diesel generators for nearly 24 hours after its on-site power plant failed during a Code Red air-quality alert."
The generators began operating after regional air quality had already reached Code Red levels because wildfire smoke from Canada was hanging over the area.
WUSA9 reported that local resident Greg Pirio said the generators started at 8:15 p.m., and by dawn, he said lung pain had driven him from his home to his daughter's house in Vienna, about 15 miles away.
Because the incident qualified as an emergency under the permit, Virginia Department of Environmental Quality Director Michael Rolband told local officials the agency could not stop the operation under current rules. DEQ said inspectors would review the event afterward and respond only if they found the permit had been violated.
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More background
State records reviewed by WUSA9 indicate that this permit setup is common in Virginia's fast-growing data-center industry: 189 of the state's 197 data-center air permits are classified as "minor," including 91 in Loudoun County.
A minor permit in Virginia can allow up to 100 tons per year of a single pollutant from diesel or gas combustion, and the process requires no public notice or hearing. In practice, that leaves regulators room to approve major combustion equipment with little direct input from nearby communities.
The debate also extends to health impacts. A February report for the Piedmont Environmental Council estimated annual health damages of $53 million to $99 million at VA2's maximum permitted emissions and projected 3.4 to 6.5 premature deaths per year in that worst-case scenario, WUSA9 reported.
DEQ disputed that report, saying it overstated actual impacts and depended on an air-dispersion model the EPA has not approved for evaluating individual facilities.
One commenter on the post wrote, "Spread this story. More and more data centers are collapsing under resource demand and damaging us." Several other commenters also asked why regulators could not intervene during an emergency with obvious effects on nearby homes.
What's being done?
Sterling District Supervisor Koran Saines suggested that county staff look for ways to regulate backup generators already operating in Loudoun County, while noting that local ordinances may offer little authority.
DEQ said inspectors would review the VA2 event after the fact. A December 2024 report from Virginia's Joint Legislative Audit and Review Commission said data-center backup generators usually operated only 10 to 30 minutes a month for routine testing.
A prolonged emergency run like the VA2 incident does not fit that normal pattern.
Vantage said the on-site natural-gas plant is temporary and that the campus is expected to connect to the grid once the utility can handle the facility's load.
The company also said it remained compliant with local noise ordinances and pointed to planned upgrades such as turbine-exhaust-louver improvements, additional sound panels, and thicker sound blankets.
Pirio said he recorded the noise overnight and measured 60 decibels at his property line, which is above Loudoun County's reported 55-decibel nighttime limit.
Where can I learn more?
These stories examine similar disputes over diesel emissions, air permits, and regulatory responses.
• In Pennsylvania, regulators approved backup diesel generators in heat as pollution fears intensified.
• In San Antonio, residents challenged permits for 32 diesel generators planned near homes.
• In Oregon, prosecutors said a diesel shop disabled emissions devices in customer vehicles.
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