Most data centers refusing to say how much water, electricity they use
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Most data centers refusing to say how much water, electricity they use
Unofficial Hacker News client; not affiliated with Y Combinator.
stingraycharles · · focus · HN ↗
I personally believe at the very least the water usage is heavily overblown compared to the agriculture industry. Elecricity is a different issue, and governments should consider reporting requirements or something like that.
Being angry with datacenter providers is not the solution. And they also need to be built somewhere, and that place is probably best where electricity is abundant and/or cheap.
usrnm · · focus · HN ↗
Definitely not the Netherlands then
black_puppydog · · focus · HN ↗
Here in France at least, companies can also be subject to FOIA requests for information pertaining to contracts they have with public entities. E.g. if a city publishes a tender to run tye local bike share program, then the company that gets the contract may have to directly answer (some) requests about that program.
But like I said, not sure if this applies to data centers which are, iiuc, mostly private ventures.
customguy · · focus · HN ↗
> Being angry with datacenter providers is not the solution.
Belittling criticisms that way is childish and doesn't address a single one. Literally nobody on the whole planet, at least in public discourse, is using "I am angry" as an argument in any of this. Yet it's the first thing that is always brought up. It's just a cheap, thought-terminating stereotype.
n4r9 · · focus · HN ↗
Data centers tend to concentrate their water usage within urban areas, causing a strain on local resources. The value of their output is much less tangible. Their water consumption scales up around tenfold if you consider the indirect usage from generating the electricity.
But on the other hand; yes, it would also help enormously if people ate less meat.
kemotep · · focus · HN ↗
bayindirh · · focus · HN ↗
I'm personally willing to change my life to help the planet and nature in general to the point it doesn't affect my wellbeing (as in health and safety). For me, personally, the problem is not changing per se, but people finding no amount of change enough, always moving the goalposts with "but, what if" clauses.
The problem with datacenter water use is the state of the water leaving the data center. Agriculture and meat industry can reuse the water multiple times from cleaner to dirtier processes and return it to the nature with reasonable processing.
The additives used by datacenters in some cases can't be filtered or processed out practically or in economically viable ways, so the water returns back as unusable, esp. if they get water from a body of water and return it with added chemicals the process gets very damaging.
MC995 · · focus · HN ↗
Why would any water be returned? Datacenters (and literally every industrial process that requires cooling) use water for evaporative cooling. The water evaporates, then returns as rain elsewhere.
The only water being "returned" I can think of would be from the intermittent or continuous blowdown systems to maintain TDS levels; but blowdown is a small fraction of the water consumed and is typically returned back via the city sewer system.
n4r9 · · focus · HN ↗
BikiniPrince · · focus · HN ↗
MC995 · · focus · HN ↗
The previously stated 80/20 isn't a bad general estimate, but it varies depending on the specific site. 10%-25% of makeup water being lost to blowdown is a reasonable range.
As for papers about it, I was only able to find a few in my brief search, but they don't land on a single number since it depends on the ratio of dissolved minerals/solids in the circulating cooling-tower water compared with the incoming makeup water, which varies due to acceptability for the process and due to the incoming water quality.
This short PDF on "Mechanical Systems Water Efficiency Management" from the EPA goes over the concepts pretty well though
- <a href="https://www.epa.gov/sites/default/files/2017-12/documents/ws-commercialbuildings-waterscore-mechanical-systems-guide.pdf" rel="nofollow">https://www.epa.gov/sites/default/files/2017-12/documents/ws...
This document from the US DOD (UFM 3-230-13, Industrial Water Treatment Operation and Maintenance (2026), Chapter 5) says that most cooling towers operate at 3-10 CoC, with 5-7 CoC identified as a cost-effective range. Where CoC is Cycles of concentration described in the previous PDF, and a higher CoC means less blowdown and better water efficiency, with the trade-off of a greater risk of scaling, corrosion, and biological/water-chemistry problems.
- <a href="https://www.wbdg.org/FFC/DOD/UFC/ufm_3_230_13_2026.pdf" rel="nofollow">https://www.wbdg.org/FFC/DOD/UFC/ufm_3_230_13_2026.pdf
Veolia also has a "Open Recirculating Cooling Systems" handbook that shows some good examples with real numbers in table 31-1.
- <a href="https://www.watertechnologies.com/handbook/chapter-31-open-recirculating-cooling-systems" rel="nofollow">https://www.watertechnologies.com/handbook/chapter-31-open-r...
Dylan16807 · · focus · HN ↗
We're talking about water that's released in general use, right? I would expect a closed cooling loop to have some biocides but have almost none of that leave the system.
And one datacenter had a weird bacteria that one time.
[deleted] · · focus · HN ↗
[deleted]
SiempreViernes · · focus · HN ↗
At first you had me, but then I realised it's not true if the price is building more data centres! That was just a trick to make the climate worse! Grr /s
thenthenthen · · focus · HN ↗
n4r9 · · focus · HN ↗
<a href="https://www.nature.com/articles/s44284-026-00487-z" rel="nofollow">https://www.nature.com/articles/s44284-026-00487-z
Aurornis · · focus · HN ↗
This isn’t some unusual outcome. It’s like one of those maps that purports to show one thing but really just shows population density.
jeffbee · · focus · HN ↗
n4r9 · · focus · HN ↗
BikiniPrince · · focus · HN ↗
n4r9 · · focus · HN ↗
jmye · · focus · HN ↗
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Joakal · · focus · HN ↗
quickthrowman · · focus · HN ↗
n4r9 · · focus · HN ↗
Aurornis · · focus · HN ↗
By “strain on local resources” are you just stating the fact that they use resources? Or are you trying to imply that it causes problems for those resources?
Companies don’t just buy land, connect to water and power, and then the utilities get caught off guard when the water system is suddenly strained by water going somewhere. There are processes for approving this before connection.
If a new project is causing a “strain on resources” then the utility planners have failed that community.
n4r9 · · focus · HN ↗
vel0city · · focus · HN ↗
A recent datacenter proposal near me was going to be built on a ~35 acre site. The entire site projected to use ~300 gallons of water a day when fully operational. That's including toilets, irrigation, etc. A household on a quarter acre lot in that area often uses 10-15,000 gallons of water in a month. 35 acres cut into quarter-acre-ish lots means a bit under 140 households. We'll cut it down and say 100 after streets and what not. That lot being a neighborhood like the others nearby would probably use at least a million gallons of water in a month, about 33,300+ gallons a day.
n4r9 · · focus · HN ↗
<a href="https://www.brookings.edu/articles/ai-data-centers-and-water/" rel="nofollow">https://www.brookings.edu/articles/ai-data-centers-and-water...
vidarh · · focus · HN ↗
n4r9 · · focus · HN ↗
[0] <a href="https://fieldreport.caes.uga.edu/publications/TP121/how-data-centers-impact-surface-and-ground-waters/" rel="nofollow">https://fieldreport.caes.uga.edu/publications/TP121/how-data...
vidarh · · focus · HN ↗
Your government.
And I don't know why you put allow in quotes. This is a matter of laws and regulation, so it is used in its most literal meaning:
Forbid construction that does not account for the externalities imposed by its water and energy usage.
> And secondly, from what I gather, closed-loop sites require an order of magnitude more power than open-loop to run.
Are you suggesting that removing x kilowatts of input takes at least 10x killowatts?
Or are you suggesting they spend 10x more energy on the cooling than an open-loop system?
The latter might well be true - an open-loop system is after all trading water for energy in a very extreme way - if you have a water source with pressure the simplest water cooling system "just" routes water over radiators. In practice you'll want a bit more than that for most setups, but it can be very cheap if you can ignore the volume of water used.
That is still a regulatory issue. You can decide which resources are critical to you in a given location, and you restrict or allow different approaches accordingly, or require funding or licensing to suit.
> That's still going to have a large impact on local resources, especially as around 2/3 of power plants supplying data centers are also ocated in water-stressed regions
Still entirely a question of regulating externalities.
Not all power generation requires significant water use. Your government is free to e.g. require new data centre capacity to be accompanied by an according buildup of generating capacity with according restrictions on water use.
If that means data centres moves elsewhere, then so be it. That is part of the goal if you argue for pricing in and regulating externalities:
Ensure that the cost of operating in a way that doesn't negatively impact the community is priced in so that decisions are taken based on the actual full cost to society.
So to go full loop to my original comment (sorry): It's entirely a question of whether or not you want to allow it.
This is what governments are for.
n4r9 · · focus · HN ↗
vidarh · · focus · HN ↗
That matters when considering what to regulate. A lot of people pushing for regulation are pushing for blocking data centres instead of regulating the externalities they claim is their issue.
n4r9 · · focus · HN ↗
RHSeeger · · focus · HN ↗
> You can't build an apartment complex here, because our water/sewer system is already over capacity
/ignores that statement and builds the apartment complex because "omg, we need more housing" arguments are used to not pay attention to consequences
/water and sewer system can't keep up and all kinds of expensive problems occur
troyvit · · focus · HN ↗
Call it an echo chamber but when it comes to data centers that's the preponderance of news that I read. These two stories are about the county next door to mine. The first story highlights how the builders of the data-center continuously broke zoning laws. The second story from a month later describes how the board of commissioners let all that slide and approved construction to continue.
<a href="https://www.cpr.org/2026/08/07/weld-county-ai-data-center/" rel="nofollow">https://www.cpr.org/2026/08/07/weld-county-ai-data-center/ <a href="https://www.cpr.org/2026/09/10/weld-county-officials-approve-data-center/" rel="nofollow">https://www.cpr.org/2026/09/10/weld-county-officials-approve...
But it's not just my state:
<a href="https://www.theguardian.com/environment/2026/sep/25/new-jersey-fines-datacenter-unpermitted-generators" rel="nofollow">https://www.theguardian.com/environment/2026/sep/25/new-jers...
Those guys were fined a "record" $1.1 million, and:
> The state is mandating DataOne apply for and obtain the required permits or cease operations, but is giving the company 45 days to do so, according to a NJDEP spokesperson. During that time, regulators are allowing the facility to continue running the generators.
That fine is a slap in the wrist.
tzs · · focus · HN ↗
That's way beyond what utility planners can reasonably plan for.
quickthrowman · · focus · HN ↗
When you apply for a connection to a utility, they make you tell them your potential usage so they can assess if they can even connect you.
brnt · · focus · HN ↗
There's no river or creek not used for drinkwater consumption or management, and they are all connected to agricultural use and transportation (canal water levels) as well. It's one big system, and farmers cheating on how much they pump up is already too big of a proboem for this to not matter.
AngryData · · focus · HN ↗
throwaway2037 · · focus · HN ↗
In short, "More than 90% of this is returned to source."
hnedeotes · · focus · HN ↗
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nekusar · · focus · HN ↗
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hnedeotes · · focus · HN ↗
NDlurker · · focus · HN ↗
hnedeotes · · focus · HN ↗
Meat too is wasteful, but yet again, here we are. All these are direct result of choices made by the majority...
vel0city · · focus · HN ↗
Only because the government forces the cost of the water to be $0 for those who got in early, a policy that's causing extreme issues ecologically and causing the collapse of tons of environments and screwing over many millions downstream.
If we actually allowed the real price today it wouldn't be anywhere near economically sane to do such a thing.
hnedeotes · · focus · HN ↗
But compared to meat and the whole chain of production required for that it certainly pales many moons below. Well, everyone loves their bacon.
vel0city · · focus · HN ↗
So yeah, an example of the government coming in and ensuring cheap water for this crop production at the expense of those downstream. You agree, if the government didn't artificially and massively change the hydrology of the area, this industrial level wouldn't really be economically possible. This can make sense and not be terribly destructive depending on the region.
I and the poster above were probably talking about the American Southwest. In this case, its even more extreme. Old land owners got the rights to flood their fields from the river water and dig massive canals to turn extremely arid deserts green. They get the right to have that water for free, forever, because the government gave them the land at one point in time in the past and allowed for that taking based on deeply flawed hydrological models. They use that for agricultural products sold worldwide, including growing alfalfa for Saudi Arabia in the deserts of Arizona[0]. The government won't go in and actually start putting restrictions or calling back their grants to that water allocations, and its resulting in environmental catastrophe for many parts of the region.
[0] <a href="https://www.pbs.org/newshour/politics/in-drought-stricken-arizona-fresh-scrutiny-of-saudi-arabia-owned-farms-water-use" rel="nofollow">https://www.pbs.org/newshour/politics/in-drought-stricken-ar...
hnedeotes · · focus · HN ↗
NDlurker · · focus · HN ↗
philipp-gayret · · focus · HN ↗
This is a Dutch website and here in the Netherlands we have demand issues. In these same areas where issues exist, data centres are being planned and built. There are waiting lists now for normal businesses who want a new connection to the net, or connections with more capacity. These are lists waiting for capacity to become available: The demand on the current net is already too high.
baranul · · focus · HN ↗
sschueller · · focus · HN ↗
I live right next to a waste valorisation plant[1]. They have to exactly specify what amount of water they use and what amount of water they then send out to the waste water treatment facility. It also has to be clean to a very specific standard before it leaves which is also checked.
We have datacenters in Switzerland too, but very little outrage or debate because there are strict rules in place in most places. They can build all they want but it costs significantly more to meet environmental requirements.
The valorisation plant next to my home has water cooling tower/fans significantly oversized just to make sure the noise is keep under the required level.
[1] <a href="https://stefan.schueller.net/posts/kva-winterthur/" rel="nofollow">https://stefan.schueller.net/posts/kva-winterthur/
maomao5 · · focus · HN ↗
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dghlsakjg · · focus · HN ↗
This is extremely inappropriate on HN. Or anywhere, really.
I can think of a few reasons that companies might not share data. A big one is that people have no idea what a responsible amount of water usage is, so your information will be weaponized no matter what.
stonogo · · focus · HN ↗
The vast majority of agricultural water use is either tapped directly from groundwater, drawn directly from surface sources, or rain. The vast majority of datacenter water use is processed water from a municipal water utility. In other words, it is meaningless to compare the two, because only one is competing with residential use, and so only one is worth caring about.
That's not to detract from serious concerns about e.g. overutilization of the Colorado River, or the idiotic practice of irrigating deserts, but it is to say that comparing datacenters to agriculture makes very little sense.
bluefirebrand · · focus · HN ↗
People need to eat, it's non negotiable. We do not need data centres.
GrantMoyer · · focus · HN ↗
bluefirebrand · · focus · HN ↗
Providing a fully vegetarian diet for everyone is kind of non-starter.
GrantMoyer · · focus · HN ↗
From an infrastructure point of view, providing everyone vegetarian food sources overnight would not be possible, but that's not a realistic scenario. With a gradual transition, the transition would reduce overall resource use on basically all fronts, so there's no reason to expect extraordinary problems.
Of course, this is all theoretical unless people care enough to change their lifestyles.
bluefirebrand · · focus · HN ↗
> A healthful vegetarian diet is not hard to achieve, at least no harder than a healthful non-vegetarian diet.
Might be true but isn't sufficient
It's still way easier to have an omnivore diet than a strictly vegetarian one. Partly that's due to how society is currently structured, but people still ate meat long before society was structured this way. Because it was easier.
ajsnigrutin · · focus · HN ↗
We need the food, we'll die without food, telling people to eat less of whatever food, so a few "tech bros" can build a new datacenter is outright evil.
edit: considering this is HN and the downvotes, people here prefer datacenters over food
zamadatix · · focus · HN ↗
The downvotes are probably about reasoning about your your conclusions instead of the things that led you to them. Though it'd be nice if that had been discussion instead of silent downvotes.
pseudo0 · · focus · HN ↗
NDlurker · · focus · HN ↗
They don't need to be built at the scale they're being built at. That's the problem.
dansquizsoft · · focus · HN ↗
But if you do end up being correct, then the data centers in question will just sit partially or fully idle, using no / a tiny fraction of the electricity and water they could use (which as others have said on this forum, water usage concerns are massively overblown in most data center builds anyway)
NDlurker · · focus · HN ↗
MC995 · · focus · HN ↗
NDlurker · · focus · HN ↗
dansquizsoft · · focus · HN ↗
Instead of, you know, people who just want to talk to ChatGPT or use Claude models for their software engineering work... I.e. the vast majority of grass-roots AI demand...
streetfighter64 · · focus · HN ↗
I'm also not sure why you think it's a good thing to produce a bunch of electronics using conflict minerals and let them sit idle? Surely you must see the negative "externalities" of this?
MC995 · · focus · HN ↗
According to whom and by what metric? The companies investing vast amounts of capital into them seem to disagree.
NDlurker · · focus · HN ↗
streetfighter64 · · focus · HN ↗
streetfighter64 · · focus · HN ↗
As others (including TFA) have noted, this is false because there's an EU directive requiring "private companies" to disclose this.
In any case, the "it's a private company" defense is as tired now as it was when it was about blocking people from social media, or debanking etc. Just because the legal system hasn't yet caught up to regulating companies in a certain way, doesn't mean that it's not in everyone's best interest (except perhaps the owners of the companies in question) to have such regulation.
> I personally believe at the very least the water usage is heavily overblown compared to the agriculture industry.
The important distinction being that agriculture provides food, while data centers provide AI slop and advertising.
testing22321 · · focus · HN ↗
Are you suggesting we should stop using water to grow food for humans?
Carrok · · focus · HN ↗
IAmBroom · · focus · HN ↗
GuB-42 · · focus · HN ↗
Because the law says they have to.
Water usage in terms of total volume is meaningless and certainly an overblown concern on a global scale. In fact, it is not a concern at all on a global scale, but it can be a local problem. If a datacenter uses water normally intended for households and the infrastructure is not designed for this, it is definitely a problem. And that's a good reason for having to report water usage, not just to punish them, but also to plan distribution accordingly.
stronglikedan · · focus · HN ↗
That isn't a good reason for them to do so. Laws need to be enforced to be effective. If no one is going to make them disclose the info, then the smart move it to just not do it, as they are.
alwa · · focus · HN ↗
“Smart” in a selfish way, but not in a bigger-picture kind of way.
I’d rather spend tax money on bridges (or tax rebates) than on bankrolling a muscular cadre of enforcers on the assumption that laws are meaningless and everyone will cheat without a cop breathing down their neck.
freecodeio · · focus · HN ↗
that's all there is to it, accounting for existing infrastructure, and somehow 500kwh is enough to invoke a reason to do so
quickthrowman · · focus · HN ↗
pjc50 · · focus · HN ↗
teeray · · focus · HN ↗
Apples and oranges comparison. We eat the direct products of water usage in the agriculture industry. It keeps people alive. It’s fallacious to compare that with water usage that goes to serving ads.
alpineman · · focus · HN ↗
m3047 · · focus · HN ↗
Conflating them is category confusion. Lying about water usage is part of CA culture.