Edit: the noise at many of these DCs are also "portable" natural gas turbines, intended for use as emergency power or temporary power at large events. But companies like xAI are using them to back-door build large power plants. xAI's memphis DC has 30+ turbines running non-stop and xAI never filed any paperwork or received any permits related to them.

AI DCs use enormous amounts of power (and thus generate enormous amounts of heat) compared to "traditional" DCs. We're talking hundreds of megawatts, sometimes gigawatts. 1GW DCs have been popping up already.

OpenAI is planning a 10GW facility in Ohio that will need its own natural gas power plant. A 10GW natural gas power plant is massive. Currently the largest NG combined-cycle power plant in the US is about 3-4GW and comprises several combined units. Typical size of a NG plant is more like 500MW.

To put that into scale: a very large Manhattan skyscraper is in the 10-20MW range, so OpenAI is planning to use as much electricity as, well, all of Manhattan's skyscrapers and then some.

Since NG turbines are at best 60% efficient, the plant itself will generate ~6 GW worth of waste heat (remember: combined cycle, so they've already extracted as much heat as they can for power.)

10GW of heat is the same amount of energy as the amount of heat from solar radiation hitting roughly 10 square miles of the earth's surface.

It's also the difference between evaporative coolers which don't need as high static pressure, and dry coolers which need to force air through more dense air-liquid heat exchangers and also have to move more air.

Where people have pushed back on water consumption, rates have been raised (water deparments are increasingly going to nonlinear billing scales which charge people more per unit when they use more) or water just isn't available - datacenter operators have had to switch to "dry" cooling where coolant or refrigerant passes through a giant radiator.

Much less effective than evaporation. So you need to move a lot more air, and it also has to be done through a radiator, which probably has higher static pressure than an evaporative cooling tower.