A Virginia state agency has issued its largest civil penalty against a data center to date, fining Microsoft $2.5 million for exceeding emissions limits during an emergency event in June 2025.
The Virginia Department of Environmental Quality (VDEQ) announced the penalty after the Microsoft facility in Leesburg, Virginia, reported a failure of an electrical substation. The failure forced the facility to operate 62 emergency engines for seven days, leading to violations of permitted fuel emissions limits for pollutants including CO, VOC, PM10, and PM2.5.
As part of a settlement, Microsoft agreed to invest $2.4 million in an air quality monitoring project in Loudoun County, where the facility is located. The funds will support the deployment of dozens of air quality sensors in areas with the highest concentration of data centers in Northern Virginia. Microsoft stated in a response that the investment aligns with its commitment to community health and environmental stewardship.
Loudoun County, home to over 250 data centers and nicknamed “Data Center Alley,” has faced growing concerns from residents about potential environmental and health impacts. In response, the Loudoun County Board of Supervisors voted 7-1 with one abstention to pause new data center application approvals for one year, effective September 15, 2025. The board’s decision follows a legal review that determined a full moratorium would conflict with state law. While new applications can still be submitted, the board will not take action on them during the pause.
The county attorney argued that the one-year pause allows time for further study and potential policy adjustments without violating state regulations. The move reflects broader debates over the rapid expansion of data centers in the region and their environmental footprint.
The VDEQ emphasized that the penalty and settlement underscore the importance of compliance with environmental regulations, particularly for facilities operating emergency backup systems. Microsoft’s investment in air quality monitoring is intended to provide additional data on regional air quality trends, though it does not address the immediate emissions violations.
The pause on new approvals comes amid increasing scrutiny of data centers in Loudoun County, where infrastructure demands and energy consumption have raised questions about long-term sustainability. The board’s decision does not halt existing operations but signals a shift in local regulatory priorities regarding new development.