Visited NOVA recently and after Loudon let them pass under the radar(right by use) for as long as they have, they've recently to tried to put the kibosh on it, or at least slow it down.
What was once a rural county outside of Fairfax, Loudon has seen tremendous development thanks to data center expansion. Now Prince William County( one county over, westward) is trying to fight the same battle before it gets too big of a problem for them.
sitkack · 2h ago
Good for them. No groundwater for data centers! Data centers should be run closed loop, if they can't, they shouldn't exist. AZ should also make them generate at least 70% of their power onsite.
bob1029 · 2h ago
I think the most cursed aspect in all of this is the fact that regions where evaporative coolers work best tend to have the scarcest water resources. Evaporative cooling is unreasonably effective when water is happy to evaporate. You can cut the power consumption of a datacenter by 70-80% in these regions if you are willing to sacrifice water.
I think in this case, solar energy is the best way to run the cooling systems, even if it requires an absurd amount of power to exercise compressors, etc. in order to improve heat concentration and rejection efficiency. As long as it's all green and theres a disaster recovery plan, who cares?
hooverd · 2h ago
If you're doing large scale evap cooling in the Sonoran you're just removing water from an already stressed water table. I'd say put them somewhere cold and do district heating during the winter.
AnthonyMouse · 37m ago
Does district heating actually work for heat from data centers? The exhaust temperature of computer equipment is only slightly above room temperature and the structures in need of heat would only be at slightly below room temperature when calling for heat. Heat distribution systems with tiny differentials like that tend to have poor efficiency, i.e. you're going to have consume a lot of energy on fans/pumps.
Meanwhile in a cold climate you can do cooling by just blowing outside air through a filter, so the alternative in those climates is that rather than running a compressor.
duped · 1h ago
I'm not a geologist but...does evaporation remove water from the water table? Where I live, my understanding is the answer is "no" because the vast majority of rain water is deposited in our groundwater. Things like agriculture are dangerous because the answer is "yes" - you're literally shopping the water away as an agricultural product.
Another dumb question: why are we building projects that need tons of power and water in the Sonoran desert instead of next to the Great Lakes
AnimalMuppet · 56m ago
It at least removes water from the local water table.
You pump water up from the local water table to run your evaporative cooler. The water evaporates. But the air was at 10-20% humidity. The water from the evaporative cooler will raise the humidity, a little bit, but not enough to make it rain. It may make it more likely to rain somewhere downwind a few miles, or a few hundred, but not here.
For your second dumb question: At least some of the Great Lakes have at times had issues with water level. (They want enough to allow ships to pass between the lakes.) The upside is, there the humidity is high enough that you're more likely to get the water back in the form of increased precipitation.
joshuaheard · 38m ago
It was going to use 1% of the available recycled water. That's about the equivalent usage of a medium size farm.
jandrewrogers · 1h ago
What should water be used for then? They do large-scale agriculture in the same area, which uses several orders of magnitude more water while generating substantially less value.
cactacea · 52m ago
Not near Tucson they don't.
EA-3167 · 1h ago
Food that people and livestock eat is less valuable than data centers used to chase the "AGI any day now" pipe dream? You're kidding right?
JumpCrisscross · 44m ago
> Food that people and livestock eat is less valuable than data centers
This is objectively false, particularly when we consider that much of that food and water are exported. It’s also irrelevant in Tucson, which doesn’t have Central Valley syndrome.
EA-3167 · 41m ago
You... do understand that it isn't exported to be incinerated, it's exported in return for money, and then people and livestock in other countries eat that food. The fact that there's a transaction in the middle of the process doesn't change the value proposition, just like the absurd overvaluation of all things AI doesn't change the value proposition there either.
JumpCrisscross · 26s ago
> it's exported in return for money
Which is also paid for data centre access.
We need food production as a matter of survival. That doesn’t mean all food production is inherently more valuable than everything else. We let most food spoil without being eaten because it’s more efficient to do that than treat every calorie as precious.
morkalork · 1h ago
Let the people eat and drink slop
UncleOxidant · 43m ago
* AI slop
jeffbee · 1h ago
Please apply this rule to Tucson's 40 golf courses.
pxc · 48m ago
Most Tucson residents undoubtedly agree. The golf courses are almost exclusively used by rich out-of-town visitors
FirmwareBurner · 1h ago
But where will the poor elites go hang out then?
NickC25 · 1h ago
They can bugger off to Phoenix and get the same type of weather, landscape, etc.
They won't be as high of altitude though so their shots won't go as far. Too bad.
This particular data center was going to build a wastewater pipeline to cool their facility with currently-squandered wastewater.
mac-mc · 1h ago
I also wonder why this isn't the go-to if you want to work in water-stressed places. Become a water distillation plant at the same time, have a win-win solution.
time_is_scary · 1h ago
> Update: Brendan Gallagher, Beale's SVP of development, said in a statement: “We are disappointed in the decision not to pursue this opportunity for Tucson. [...] We see it as a missed opportunity for the city, as this project potentially represents tens of millions of dollars in tax revenue, hundreds of millions of dollars in infrastructure to serve the community, and thousands of high-paying local and union jobs.”
and I'm "potentially" the next president of the U.S.
Mars008 · 38m ago
They would have to build a road to datacenter, datacenters themselves, all GPUs etc put together. That requires "thousands of high-paying local and union jobs" for short time. "hundreds of millions of dollars in infrastructure". Then a dozen of armed guards with dogs.
polski-g · 50m ago
Datacenters do not employ thousands of jobs. They employ about 5.
https://virginiabusiness.com/loudoun-county-supervisors-shak...
What was once a rural county outside of Fairfax, Loudon has seen tremendous development thanks to data center expansion. Now Prince William County( one county over, westward) is trying to fight the same battle before it gets too big of a problem for them.
I think in this case, solar energy is the best way to run the cooling systems, even if it requires an absurd amount of power to exercise compressors, etc. in order to improve heat concentration and rejection efficiency. As long as it's all green and theres a disaster recovery plan, who cares?
Meanwhile in a cold climate you can do cooling by just blowing outside air through a filter, so the alternative in those climates is that rather than running a compressor.
Another dumb question: why are we building projects that need tons of power and water in the Sonoran desert instead of next to the Great Lakes
You pump water up from the local water table to run your evaporative cooler. The water evaporates. But the air was at 10-20% humidity. The water from the evaporative cooler will raise the humidity, a little bit, but not enough to make it rain. It may make it more likely to rain somewhere downwind a few miles, or a few hundred, but not here.
For your second dumb question: At least some of the Great Lakes have at times had issues with water level. (They want enough to allow ships to pass between the lakes.) The upside is, there the humidity is high enough that you're more likely to get the water back in the form of increased precipitation.
This is objectively false, particularly when we consider that much of that food and water are exported. It’s also irrelevant in Tucson, which doesn’t have Central Valley syndrome.
Which is also paid for data centre access.
We need food production as a matter of survival. That doesn’t mean all food production is inherently more valuable than everything else. We let most food spoil without being eaten because it’s more efficient to do that than treat every calorie as precious.
They won't be as high of altitude though so their shots won't go as far. Too bad.
It's worst. They use tap water.
"...For the purposes of cooling, data centres mainly use potable water (water that is safe to drink or use for cooking, free from harmful contaminants). .." - https://www.twobirds.com/en/insights/2025/cooling-the-cloud-...
and I'm "potentially" the next president of the U.S.