Why Data Centers Use So Much Water — And What That Means for Cooling and Backup Power

We’ve all seen the headlines.

Data centers consume massive amounts of electricity. They use large volumes of water. They strain infrastructure.

Those statements aren’t wrong. But they’re often presented without context.

To understand why data centers draw significant power and use water for cooling, you only need one principle:

Every watt of electricity becomes heat.

And in high-density computing environments operating 24 hours a day, that heat never stops.

Electricity In, Heat Out

Servers inside a data center convert nearly all incoming electrical energy into thermal energy. As artificial intelligence and cloud computing workloads grow, data-rack densities increase, and total power consumption rises.

That means:

• Higher heat output per data rack
• Greater total thermal load per facility
• Continuous operation without shutdown windows

Unlike many industrial processes that cycle or operate in shifts, data centers are built for constant uptime. There is no “overnight cool down.” There is no seasonal pause.

Cooling systems must remove heat at the same rate it is generated — continuously.

Why Water Plays a Major Role

Air cooling alone is often insufficient for large-scale, high-density facilities. Water absorbs heat far more efficiently than air, which is why many data centers rely on:

• Cooling towers
• Chilled water loops
• Condenser water systems
• Liquid-to-liquid heat exchangers

Evaporative cooling towers use the phase change of water to reject heat to the atmosphere. The higher the thermal load, the more heat must be transferred — and the more work cooling systems must perform.

This is where motors become critical.

Cooling towers depend on continuous-duty fan motors.
Chilled water systems depend on pump motors operating around the clock.
Air handling systems rely on variable-speed drives to match airflow to demand.

In short: water moves heat, and motors move water.

Continuous Duty Changes Equipment Requirements

Cooling systems in data centers do not operate intermittently. They run 24/7, often under variable load conditions driven by computing demand.

That operating profile introduces several challenges:

• Sustained thermal stress
• Inverter-driven operation
• Bearing current risks
• Efficiency sensitivity at partial load

Severe-duty motor platforms, such as Marathon’s XRI® motors, are built to withstand these conditions. Cast-iron construction, robust insulation systems like MAX GUARD®, and provisions for bearing current protection help support long service life in demanding environments.

In applications such as cooling tower fans and chilled water pumps, inverter-duty design is essential. Motors must tolerate fast IGBT switching while maintaining stable performance at reduced speeds.

When paired with properly configured VFD systems — including Marathon’s CONTROLMAX® drive solutions — airflow and water flow can be precisely controlled without sacrificing motor longevity.

Cooling performance depends on both the motor and the drive.

Where PMAC Technology Fits

Efficiency in a 24/7 facility is not incremental — it compounds.

Pump and fan systems frequently operate at partial load as thermal demand fluctuates. In these conditions, permanent magnet motor platforms such as BlackMAX® PM can maintain high efficiency across a wide speed range.

That delivers several advantages:

• Reduced electrical losses
• Lower internal motor heating temperatures
• Improved operating temperature margins
• Reduced overall facility load

Lower electrical losses mean less wasted energy — and slightly less heat introduced into the system itself. While the primary thermal load originates from servers, efficient cooling equipment helps minimize additional heat burden.

In large facilities, even small efficiency improvements scale significantly over continuous operation.

Cooling and Power Are Interdependent

Cooling systems do not operate in isolation. They depend entirely on stable power.

In the event of a grid interruption, backup generation must assume load quickly and reliably — not only for computing equipment but also for cooling infrastructure.

Generators serving data centers must tolerate:

• Nonlinear electronic loads
• Rapid load steps
• Continuous-duty operation
• Strict voltage regulation requirements

Platforms such as Marathon’s DATAMAX™ generators are engineered for these environments, incorporating low subtransient reactance designs, digital voltage regulation, and robust rotor construction to support mission-critical performance.

Without reliable backup power, cooling systems stop.
Without cooling, computing stops.

The two systems are inseparable.

Beyond the Headlines

Yes, data centers consume electricity.
Yes, they use water for cooling.

But the underlying reason is straightforward: continuous, high-density computing generates continuous heat, and heat must be removed.

The engineering challenge is not simply reducing consumption — it is maintaining thermal balance without interruption.

That requires:

• Efficient cooling tower motors
• Reliable pump motors
• Inverter-duty construction
• Properly matched VFD control
• Dedicated, high-performance backup generation

In high-uptime environments, cooling and power are not auxiliary systems.

They are foundational infrastructure. And when designed correctly, they work together to support the digital systems the modern economy depends on.

This is why you should use the BlackMAXPM® motors that come with lower operating temperatures, high power density / low weight design, stocked with shaft grounding rings (SGR), IE4 efficiencies, and provisions for mounting encoders to name a few. Powered with our CONTROLMAX CM5 Series drives offers a system solution.