Data centers raise nearby temperatures by up to 4 degrees in Phoenix

TL;DR

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A new study confirms that data centers in Phoenix elevate nearby air temperatures by up to 4°F due to waste heat emissions. This impact extends up to a third of a mile and could contribute to urban heat challenges. The findings emphasize the need for mitigation strategies as data center capacity grows.

Researchers at Arizona State University have confirmed that data centers in Phoenix can raise nearby air temperatures by up to 4°F due to waste heat emissions, marking a significant urban environmental impact as data center capacity expands across cities.

The study, the first to directly measure neighborhood-scale temperature effects downwind of data centers, involved mounting high-precision sensors on vehicles traveling around four facilities in Phoenix, ranging from 36 MW to 169 MW in capacity. Results showed that air temperatures downwind of these centers averaged 1.3 to 1.6°F warmer than upwind conditions, with peaks reaching 4°F above ambient temperatures. The thermal influence was detectable up to approximately 0.3 miles (about five city blocks) from the data center perimeters.

Lead researcher David Sailor explained that even a one- or two-degree increase in local temperature can significantly impact urban heat levels, especially in a city like Phoenix already vulnerable to extreme heat. The waste heat from a single data center can surpass the heat output of 40,000 households, highlighting the potential scale of this issue as capacity increases.

Why It Matters

This development is important because it indicates that data centers contribute to urban heat islands, which can exacerbate heat-related health risks and increase cooling energy demands. As data center capacity is projected to more than double by 2030, the cumulative impact on city temperatures could be substantial, affecting public health, energy consumption, and urban planning strategies.

Background

Previous assessments relied on satellite data to estimate the heat impact of data centers, but this study provides the first direct, real-time measurements of how waste heat affects local air temperatures. The Phoenix area, with its high concentration of data centers, exemplifies the potential for digital infrastructure to influence urban microclimates. The findings underscore the need for integrating thermal impact considerations into city planning and data center siting decisions.

“Even if these data centers only contribute to an additional heat island magnitude of one or two degrees, that can still have a very significant impact on our lives.”

— David Sailor, lead researcher

“As we do more measurements under different atmospheric conditions, I think we’re going to see more significant impacts around data centers.”

— Sailor

What Remains Unclear

It remains unclear how different weather conditions, seasonal variations, or larger-scale data center developments will influence the magnitude of temperature increases. Further research is planned to develop detailed atmospheric models and assess mitigation strategies.

What’s Next

Researchers intend to expand measurements across different weather scenarios and over longer periods to refine models of heat impact. City planners and industry stakeholders are encouraged to collaborate on design modifications and policies to reduce thermal footprints, such as improved cooling technologies and buffer zones.

Key Questions

How much can a data center increase local temperatures?

According to recent measurements, nearby air temperatures can rise by up to 4°F downwind of a data center, with impacts detectable up to about a third of a mile away.

Why is this temperature increase a concern?

Even small increases in local temperature can worsen urban heat islands, increase cooling energy needs, and pose health risks during heatwaves, especially in already hot cities like Phoenix.

Are all data centers contributing equally?

The impact depends on the size and cooling systems of the data center. Larger facilities with higher capacity tend to produce more waste heat, but even smaller centers can contribute significantly in dense urban areas.

What can be done to reduce the heat impact?

Potential solutions include redesigning cooling systems, creating green buffers such as parks, and implementing stricter siting and permitting policies to minimize thermal pollution.