Despite Elon Musk's announcement on Monday that xAI's Colossus 2 data center had reached a 1 GW scale, the supercomputer is not even close to that because of the insufficient cooling capacity it currently has, according to a satellite image published by researchers from Epoch AI.
Based on 550,000 Nvidia Blackwell AI accelerators, xAI's Colossus 2 is advertised as the industry's first AI facility that consumes one gigawatt of power for AI inference and training. However, for now, the data center codenamed 'Macrohard' purportedly only has 350 MW of cooling capacity, which is not enough to cool down 550,000 Blackwell GPUs at full power even in winter. As a result, Musk's announcement made on January 19 may have been premature to put it mildly. Epoch AI expects the supercomputer to reach 1 GW by May.
xAI's Colossus 2 data center is running, but likely won't reach 1 GW of power until May, despite prior claims by Elon Musk.Our updated analysis shows the facility lacks the cooling capacity to run 550,000 Blackwell GPUs at full power, even in winter conditions. pic.twitter.com/C1mw7e2dDDJanuary 19, 2026
Interestingly, when Grok, xAI's AI bot, was asked about Colossus 2, it confirmed that the launch of the supercomputer may be phased. Furthermore, it recalled media reports claiming that xAI may be using unpermitted gas turbines for extra power.
At the pace that Colossus 2 is being equipped with cooling systems right now, the new supercomputer will become a gigawatt-class machine sometime in May, according to the research. Meanwhile, the machine was once predicted to use a million GPUs, and then Musk said that it could scale to 1.5 GW or even 2 GW whenthe time comes. When this could happen is not known because xAI needs to get enough AI servers, procure enough power, and then get cooling systems.
Even though xAI's Colossus 2 will hit its 1 GW milestone later than expected, it is still projected to be ahead of its rivals from Amazon and OpenAI, according to a graph by Epoch AI. The company will have more resources for AI training, AI inference, and agentic AI workloads than its rival for some time.
The Colossus 2 supercomputer for @Grok is now operational. First Gigawatt training cluster in the world. Upgrades to 1.5GW in April. https://t.co/GpgZ6Pe30sJanuary 17, 2026
Based on the graph's reference lines, the power consumption of the whole city of San Diego averages ~800 MW, Amsterdam consumes around ~1.6 GW, and the power consumption of Los Angeles is about ~2.4 GW, which puts modern frontier AI data centers in the same class as major cities. When fully equipped and ramped, xAI Colossus 2 at roughly 1.3 GW – 1.4 GW, would consume about 1.7× San Diego's power, slightly less than Amsterdam, and around 60% of Los Angeles.
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