Data Centers: Environmental Challenges and Some Solutions
Three-Page Summary Original article by David L. Russell, PE, ASP
Data centers now sit at the center of two overlapping stories: the AI boom, and a global scramble for electricity, water, and land to support it. This summary distills the environmental challenges the original article identifies – power supply, water use, standby generation, noise, and light – along with the practical mitigation measures available today.
Key Figures at a Glance
| Metric | Figure |
|---|---|
| Global data center electricity use (2024) | ~415 TWh (~1.5% of global electricity demand) – IEA |
| Projected global use, 2030 / 2035 | 945 TWh / ~1,200 TWh – IEA Base Case |
Projected U.S. data center power demand, 2035 | ~106 GW (BloombergNEF, Dec. 2025 estimate; revised higher since) |
Typical PUE (Power Usage Effectiveness) | ~1.54 average; 1.10 or better at top hyperscale facilities |
Example facility modeled in the article | 200 MW IT load → 308 MW total facility power at PUE 1.54 |
Example facility modeled in the article | 200 MW IT load → 308 MW total facility power at PUE 1.54 |
Standby generator configuration (example) | 125 × 2,500 kW diesel sets (N+1), ~18,125 gal/hr diesel at full load |
Cooling water flow (evaporative option, example) | ~210,000 gpm tower flow; ~3 million gal/day evaporated |
The Core Problem
Data center environmental consulting has become essential as AI drives explosive growth in data centers, and data centers drive explosive growth in electricity demand. The IEA projects global data center electricity use will roughly double from about 415 TWh in 2024 to 945 TWh by 2030, and reach about 1,200 TWh by 2035. BloombergNEF separately forecasts U.S. data center power demand alone could hit 106 GW by 2035 (a figure BloombergNEF has since revised upward again in later reporting), while Gartner projects worldwide consumption rising from 448 TWh in 2025 to 980 TWh by 2030. All of these estimates hinge on how fast businesses actually adopt AI.
Companies are responding by locking up power at scale. Microsoft signed a 20-year deal with Constellation Energy to restart Three Mile Island Unit 1 (835 MW), and Meta, xAI, Amazon, and others are building or planning data center campuses from 1 GW up to 5 GW each across states including Louisiana, Texas, Ohio, Mississippi, Indiana, and Pennsylvania.
Measuring Efficiency: PUE
Power Usage Effectiveness (PUE) compares a facility’s total power draw to the power used purely for computing. Industry average PUE is about 1.54; top hyperscale facilities reach 1.10 or better, against a theoretical floor of 1.0. A 200 MW IT load at a PUE of 1.54 means a facility actually draws 308 MW. The extra 108 MW goes to cooling, pumps, lighting, and controls.
Fuel and Emissions Behind the Power
Generating electricity from fossil fuels carries its own footprint. Per the EIA, producing 1 kWh takes about 1.14 lb of coal, 7.42 ft³ of natural gas, 0.08 gallons of petroleum, or 0.85 lb of petroleum coke. Scaled up, a single terawatt-hour requires roughly 570,000 tons of coal or 80 million gallons of petroleum. This matters both for a data center’s overall carbon footprint and for the fuel logistics of running backup generators. Backup power is typically diesel. EPA AP-42 emission factors show diesel generators release CO2, CO, SO2, NOx, and particulates per gallon burned. Because a generator bank starts up at ground level near neighboring communities, a prolonged outage can create localized air quality impacts.
Alternative Power Options
- Small modular nuclear reactors, based on decades of Navy submarine reactor experience, offer a reliable, low-carbon option.
- On-site gas turbines can serve as primary or standby generation.
- Floating, wave-powered data centers (concepts reportedly explored by companies including Panthalassa, Nautilus Data Technologies, and Beijing Highlander Digital Technology) remain largely unproven and should be treated as emerging concepts, not established solutions.
- Space-based data centers could shed heat without warming the planet, but cost and engineering hurdles make this a distant, speculative option.
Water Use and Pollution Risk
Water Use Effectiveness (WUE) measures liters of water used per kWh of IT energy, ranging from 0 (fully air-cooled) to about 2.5. Water has roughly 3,200 times the heat capacity of air by volume, which is why evaporative cooling towers are so effective, but they consume large volumes of water and concentrate dissolved minerals and contaminants, including PFAS, in the blowdown stream sent to wastewater treatment. A theoretical 200 MW, PUE-1.54 facility with an evaporative cooling tower could draw roughly 210,000 gallons per minute of tower water and evaporate about 3 million gallons per day. An all-air-cooled version of the same facility could cut water use to nearly zero, at the cost of substantially more energy for air handling.
Large, largely impervious data center footprints (some over 500,000 sq ft) generate significant stormwater runoff, so most jurisdictions require retention ponds sized to a local design storm. These ponds also double as spill-containment for the large volumes of diesel fuel stored on site.
Electrical Infrastructure and Standby Generators
Because AC power factor is less than 1 (about 0.92 in a typical case), the apparent power a utility must supply is meaningfully higher than the facility’s real power demand. A 308 MW real load requires roughly 335,000 kVA of apparent capacity, with utilities typically planning an additional safety margin on top. Standby diesel generators are usually sized N+1 (one spare beyond the minimum needed) or, for critical facilities, fully redundant at 2N. A 200 MW facility might need roughly 125 generator sets of 2,500 kW each for N+1 redundancy, consuming on the order of 18,000+ gallons of diesel per hour when running, which in a 12-hour outage could require dozens of tanker-truck deliveries to resupply.
Generators also require battery banks to handle the current inrush at startup, and large motors elsewhere in the facility (chillers, cooling equipment) typically use Variable Frequency Drives to avoid voltage dips when backup power engages. In the example above, roughly 500 heavy-duty batteries support the full generator fleet.
Noise and Light
Unsilenced generator banks can produce 120+ dBA, requiring hospital-grade silencers, vibration isolation, and multiple layers of sound barriers to bring nighttime noise down to the 45-50 dBA typically acceptable near residential areas, sometimes requiring buffer distances of several miles without mitigation. Mitigation includes vibration reducing mounting on buildings and equipment, and Level 3 and Level 4 acoustic screening, plus substantial distance barriers and, where required, earthen embankments.
Lighting is also a concern: high-UV, upward-facing, or floodlit fixtures can disrupt migratory animals, so dark-sky compliant, warm-toned, motion-controlled lighting is the recommended approach. Recommended lighting should have a color temperature of less than 3,000°K (red-orange range), sensor controls, and no high pole mounting.
Bottom Line
Data centers can be good neighbors, but only with real investment in power planning, water management, emissions control, and noise and light mitigation. The article’s central message is transparency: developers who proactively disclose their environmental design choices and mitigation measures will face far less community resistance than those who do not. Global Environmental Operations offers data center environmental consulting, air pollution testing, water treatment, and remediation services for developers across Atlanta, GA and beyond.