By Laura Anderson, Welp Magazine. Published and last updated October 16, 2026.
Every time you ask an AI a question, a building somewhere gets a little hotter. Now add record summers and a returning El Nino, and data center heat waves stop being a niche engineering worry. They become a business problem, and some of the world’s biggest companies are looking for an escape: under the sea, under a mountain, up near the Arctic Circle, and even into orbit.
But is the rush to cold places real, or is it clever marketing? This guide separates fact from hype, and shows where data centers are actually likely to go next.
Quick Facts: Data Center Heat Waves and the Next Move
- Why heat matters: Servers turn electricity into heat, so data center heat waves push cooling systems toward their limits.
- Exposure: A First Street report found 54% of data centers sit in areas under chronic heat or water stress.
- Outage risk: Cooling is the second biggest cause of impactful outages, at 14%, per Uptime Institute figures cited by Aggreko.
- Where they may go: Arctic Norway, flooded undersea capsules off China, mines like Lefdal, and even orbit.
- Reality check: We found no confirmed 2026 outage caused by El Nino. The risk is real, but it is a warning, not a record of failure.
Why Do Data Centers Need Cooling in the First Place?
Servers turn electricity into computation, and part of that energy leaves as heat. If the heat is not removed, chips slow down, throttle or fail. That is why cooling is not a luxury. It is the thing keeping the internet on.
AI makes it harder. AI chips such as GPUs sit in denser racks and run hotter than ordinary servers, so every new AI building needs far more cooling per square meter. Many sites use evaporative cooling, which is efficient but uses water. Lawrence Berkeley National Laboratory research suggests direct water use by US data centers could rise two to four times by 2028 compared with 2023. Newer designs use closed loop liquid cooling to cut water use, but zero water designs typically need more electricity.
How Data Center Heat Waves Put Cooling Under Pressure
During data center heat waves, outside air gets hotter, so cooling equipment works harder for longer. Chillers and cooling towers lose efficiency. Power grids strain at the same moment, and water supplies can tighten. That triple squeeze is the real danger.
- Outages: Uptime Institute analysis cited by Aggreko ranks cooling as the second largest cause of impactful outages, at 14%, behind power. One fifth of respondents said their latest outage cost more than $1 million.
- Old equipment: Aggreko warned that ageing cooling assets are the most likely to lose efficiency or fail in extreme heat. Note that Aggreko sells temporary cooling, so treat its advice as vendor guidance.
- Location risk: A First Street report, covered by E&E News in June 2026, found 54% of all data centers are in areas facing chronic stress such as extreme heat or water scarcity.
Is El Nino Really Threatening Data Centers?
This is where headlines run ahead of facts. El Nino does raise heat and water stress in some regions. Marsh says in Southeast Asia it can strain water supplies and electricity generation, and when those fail, cooling follows, causing business interruption. It also warns that standard business interruption insurance may not respond if disruption happens without physical damage.
What we could not find is a confirmed 2026 outage caused by El Nino. The honest picture is a growing risk and a lot of warnings, not a documented collapse. For the climate background, read our guide to El Nino heat waves and the wider El Nino impact on drought, floods and food.
Option 1: The Arctic. Are Companies Really Moving to the Snow?
Yes, some are. Arctic Core has begun groundwork in Kautokeino, Norway, targeting 2 MW of capacity by late summer 2026 and more than 5 MW in a second phase, citing cold air and cheap hydropower. That is a company announcement, so its claims are self reported. Nscale runs a site in Glomfjord and built a newer campus in Narvik, using Arctic air and fjord water. In Alaska, Stack Energy has proposed a three gigawatt modular site on the North Slope. Russia’s Murmansk region also has a planned project.
The catch: power, not cold
Cold air cuts cooling costs, but data centers also need huge, reliable electricity. In April 2026, Norway’s grid operator Statnett halted new grid reservations in Northern Norway because industrial demand surged. The Arctic Institute also argues the environmental risks of building in this fragile region have gone largely unexamined. Nscale’s Norway sites run on renewables, but Stack Energy’s Alaska plan does not.
Option 2: Underwater Data Centers
The idea sounds wild, but it has a track record. Microsoft’s Project Natick ran 855 servers for more than two years with no human intervention, and the underwater servers were reportedly eight times more reliable than land based ones. Microsoft has reportedly shelved the project.
China picked it up. A commercial underwater data center has operated off Lingshui, Hainan since 2023, with plans for 100 data cabins. In May 2026, Shanghai Hailanyun Technology launched what it calls the world’s first wind powered underwater data center, planned at 24 MW and reported to cost around $223 million to $228 million depending on the source. Microsoft’s tests also showed slight local warming of seawater, so environmental effects remain a question.
Option 3: Underground Data Centers
Rock is a natural insulator, and mines offer security and stable temperatures. Norway’s Lefdal Mine Datacenter, a former olivine mine whose entrance sits roughly 700 meters inside a mountain, uses cold fjord water for cooling and claims a PUE between 1.08 and 1.1. It is aimed at high performance computing and AI, targets 200 MW and reportedly supports about 130 kW per rack. Infrastructure investor 3i is acquiring a majority stake, with completion expected in summer 2026.
Option 4: Data Centers in Space
The boldest idea is orbit. Starcloud launched a satellite with an Nvidia H100 GPU in November 2025, then raised a $170 million Series A at a $1.1 billion valuation in March 2026. Google’s Project Suncatcher has put a prototype with four TPUs in orbit, in a sun synchronous path that keeps solar panels almost always lit. Google reports its chips survived nearly three times the expected radiation dose. SpaceX has said it expects orbital AI compute satellites as early as 2028.
Space has its own heat problem, since getting rid of heat in a vacuum is hard. Experts disagree on timing: one University of Arizona researcher sees commercial viability in about a decade, while Jeff Bezos has said ten to twenty years. The claim of ten times lower energy costs is a company pitch.
Where Will Data Centers Go Next? A Side by Side Look
| Option | Big advantage | Main risk | Maturity |
|---|---|---|---|
| Arctic | Cold air, cheap hydropower | Grid limits, fragile environment | Early builds |
| Underwater | Constant cold seawater | Ocean impact, maintenance | Pilot and early commercial |
| Underground | Stable temperature, security | Limited sites, upfront cost | Operating today |
| Space | Constant solar power | Heat rejection, cost, repair | Experimental |
Our read: the near term winner is boring. Most data centers will stay where the people and power are, and upgrade to liquid cooling, better siting and smarter water use. Arctic and underground sites will grow for AI training, which tolerates distance. Underwater and space are bets for the next decade.
What Data Center Heat Waves Mean for You
- Businesses: Ask your cloud provider about cooling redundancy, regional heat risk and failover. Check what your insurance covers.
- Cities and residents: Water and power use by new data centers is becoming a local political issue.
- Investors and founders: Cooling technology is a growing market. See our look at climate technology startups for extreme heat.
- AI watchers: Every new model adds heat. Read how Gemini 4 Argon and voice AI agents raise the demand for computing.
How to Prepare for Data Center Heat Waves
Data center heat waves are predictable enough to plan for. Operators and customers can reduce the damage long before temperatures spike.
- Audit cooling early. Before peak summer, check chillers, cooling towers and backup units. Data center heat waves hit old equipment first.
- Diversify regions. Spread critical workloads across regions so one heat wave cannot take down everything.
- Plan for water and power. Data center heat waves strain both at once, so line up backup supply and load shedding rules.
- Use smarter cooling. Direct to chip liquid cooling handles hot AI chips better and can cut water use.
- Read the insurance fine print. Business interruption cover may not pay out if there was no physical damage.
The pattern is clear. The companies that treat data center heat waves as a routine risk, not a surprise, will recover fastest.
Bottom Line: Cold Is Not a Free Fix
Data center heat waves are a genuine and rising risk, and companies are experimenting in every direction. But the Arctic is limited by power, the sea raises environmental questions, mines are few and space is years away. The smartest move today is better cooling where data centers already are. For more tech and climate coverage, browse our AI section.
How We Reported This
This article draws on E&E News, DataCentreNews, Marsh, Arctic Today, company announcements, Data Center Dynamics and other reports as of October 16, 2026. Many project figures are company reported, and we flag where sources differ. We did not find confirmed outages caused by El Nino and do not claim any.
References and Further Reading
- E&E News: Heat waves and drought imperil data center operations
- Marsh: El Nino and data centre business interruption in Asia
- DataCentreNews: Aggreko urges data centres to review cooling plans
- Arctic Today: The AI Arctic land grab
Frequently Asked Questions About Data Center Heat Waves
Do data center heat waves shut down servers?
They can. Heat waves raise cooling demand and strain power and water supplies. Cooling failure is the second largest cause of impactful data center outages at 14%, but most facilities are designed with backup cooling, so full shutdowns are rare.
Is El Nino hurting data centers?
El Nino raises heat and water stress in some regions, especially Southeast Asia, where Marsh warns that water and power shortages can disrupt cooling. We found no confirmed outage caused by El Nino in 2026.
Why do data centers need cooling?
Servers convert electricity into computation, and part of that energy becomes heat. If it is not removed, chips overheat and fail. AI chips run denser and hotter, which raises cooling needs.
Are companies really building data centers in the Arctic?
Yes. Arctic Core has begun work in Kautokeino, Norway, Nscale operates in Norway, and Stack Energy has proposed a large North Slope site in Alaska. Grid power, not cold air, is the main constraint.
Do underwater data centers work?
Microsoft’s Project Natick ran 855 servers for over two years and found them far more reliable than land servers, but Microsoft reportedly shelved it. China is now building commercial underwater data centers off Hainan and Shanghai.
Will data centers move to space?
Startups and Google are testing it. Starcloud launched a GPU into orbit in 2025 and Google has a prototype under Project Suncatcher, but experts say commercial viability is roughly a decade or more away.
