What's Happening?
Digital Realty's new hyperscale data center campus in Charlotte, North Carolina, is facing scrutiny over a proposed Mecklenburg County air quality permit. The permit would allow the company to operate 242 diesel generators as a standby power source, capable
of producing 726 megawatts. These generators would be used when the main power supply fails. According to WFAE, the city's public radio station, the permit would allow for the emission of over 100 tons of air pollutants annually, including smog-forming emissions and carbon monoxide. The Charlotte Observer previously described the project as a 156-acre site with two buildings totaling 3 million square feet, designed for up to 400 MW of IT capacity, making it one of North Carolina's largest data centers. Digital Realty is also funding a new substation that Duke Energy will own and operate. The Charlotte City Council rezoned the land in May 2025, and the project was approved before a 150-day moratorium on new data centers was enacted in June 2026.
Why It's Important?
This situation highlights the growing environmental concerns associated with the rapid expansion of data centers, particularly their reliance on diesel generators for backup power. While essential for maintaining continuous operation of critical IT infrastructure, the potential emission of over 100 tons of air pollutants annually raises significant public health and environmental questions for the Charlotte community. The scale of the proposed diesel generation, exceeding that of many power stations, underscores the substantial energy demands of hyperscale data centers. The fact that the project was approved before a local moratorium on new data centers also brings into focus the challenges local governments face in balancing economic development with environmental protection. This case could set a precedent for how future data center projects are evaluated in terms of their environmental impact and the regulatory frameworks governing their operations.
What's Next?
The Mecklenburg County air quality regulators have not yet made a decision on the proposed permit, and the public comment window is reportedly closing soon. The outcome of this permit review will be crucial for Digital Realty's Charlotte campus and could influence future data center developments in North Carolina and beyond. If approved, the emissions from these generators will contribute to local air pollution, potentially impacting air quality and public health. If denied or significantly modified, it could force Digital Realty and other data center operators to explore alternative, cleaner backup power solutions, such as large-scale battery storage or other renewable energy options. This situation also emphasizes the need for more comprehensive environmental impact assessments and potentially stricter regulations for data center construction and operation, especially concerning their energy consumption and backup power strategies.
Beyond the Headlines
The debate over Digital Realty's diesel generators in Charlotte reflects a broader tension between technological advancement and environmental sustainability. As AI and other digital technologies demand ever-increasing computing power, the physical infrastructure supporting them, particularly data centers, becomes a significant energy consumer. The reliance on fossil fuel-powered generators for backup highlights a systemic challenge in ensuring energy resilience without exacerbating climate change and local pollution. This issue extends beyond Charlotte, as communities nationwide grapple with the environmental footprint of data centers. It prompts questions about the long-term viability of current data center designs and the imperative for innovation in sustainable energy solutions for critical infrastructure. The public's engagement in the permit process also signals a growing awareness and demand for accountability from corporations regarding their environmental impact.
