Texas Data Centers Threaten 20 Years of Air‑Quality Gains

A Houston‑based research organization has warned that the rapid construction of data centers in Texas could push the state’s fine‑particle pollution to levels last seen in the mid‑2000s, erasing a decade of gains in air quality. The Houston Advanced Research Center (HARC) modeled the impact of all proposed data center projects plugging into the existing grid mix and found that soot‑forming pollutants could more than triple, while smog‑forming NOx emissions could rise 136 percent. The report, released on October 22, 2026, also projects a 90 percent climb in carbon‑dioxide emissions by 2025 if the same scenario unfolds.

Key points

• HARC’s model shows fine‑particle pollution could triple in Texas over five years.
• NOx emissions could rise 136 percent, approaching 2004 levels.
• CO₂ emissions could climb 90 percent above 2025 levels.
• Using onsite renewable power could cut NOx by up to tenfold.
• 26 GW of data‑center capacity already exists in Texas; proposed projects could add four times more.

What happened

The study, published by HARC, was prompted by a wave of new data‑center projects announced across Texas in 2024 and 2025. The state, already the largest data‑center market in the U.S. with 26 gigawatts of existing and under‑construction capacity, is projected to add a further four times that amount if all proposals proceed. HARC’s model assumed that every new center would draw power from the current Texas grid, which relies heavily on natural‑gas turbines. Under this scenario, the state would see a 90 percent increase in CO₂ and a 136 percent jump in NOx, pushing fine‑particle levels to the highest point since 2006.

The report also explores alternative power strategies. If developers pair grid power with onsite renewable generation—solar or wind—the NOx figure could be reduced by as much as ten times. Conversely, installing gas engines on site to bypass grid connection delays could produce the worst‑case pollution scenario. The study’s findings highlight that the choice of power source will determine whether the data‑center boom cleans up or re‑pollutes the air.

The backstory

Texas’s appeal to data‑center operators stems from its low electricity rates, abundant land, and a deregulated market that encourages rapid deployment. Over the past decade, the state has become the hub for large‑scale cloud and generative‑AI infrastructure, drawing developers who seek cheap, reliable power. However, the same infrastructure that supports the digital economy also drives up electricity demand, prompting developers to look for onsite solutions such as gas turbines or renewable farms.

Historically, the Texas grid has been built around natural‑gas plants, which emit both CO₂ and NOx. The state’s regulatory environment has allowed rapid expansion of these plants, but it has also limited the deployment of cleaner alternatives. The Wood Mackenzie report cited in the HARC study notes that Texas is set to host four times the amount of onsite‑generated data‑center power than any other state, a trend that could exacerbate emissions if not managed carefully.

Why the choice of power matters

The source of electricity for a data center directly influences its environmental footprint. HARC’s analysis shows that coupling grid power with onsite renewable generation can reduce NOx emissions by up to tenfold. This outcome hinges on the fact that renewables produce negligible NOx and far less CO₂ per kilowatt‑hour than gas turbines. In contrast, developers who opt for gas engines to avoid grid connection delays face a stark trade‑off: faster construction at the cost of higher emissions.

The analysis also reveals a second‑order effect. If data centers flood the grid with demand, the state might increasingly rely on its largest remaining power source—natural gas—to meet peak loads. This could lock Texas into a high‑emission path for years, undermining policy goals aimed at reducing air pollution. Developers who invest in onsite renewables not only lower their own emissions but also reduce strain on the grid, potentially easing the need for additional gas capacity.

What builders and businesses should do

• Conduct a life‑cycle emissions audit before acquiring new sites.
• Prioritize sites with access to renewable resources or existing solar/wind farms.
• Negotiate power purchase agreements that include renewable credits or on‑site generation.
• Design data‑center cooling systems to maximize energy efficiency, reducing total power draw.
• Engage with local utilities to explore grid‑load management options and avoid high‑emission peaking.

The bottom line

Texas’s data‑center boom could reverse a decade of air‑quality progress if developers rely on the current gas‑heavy grid. The next few months will see key policy decisions on permitting and grid upgrades; staying ahead of these changes will be critical for builders and investors alike.