Anthropic bought 1.7 gigawatts of gas generators. Its own IPO filing told you it would, six days early.

On Sunday the Financial Times reported that Anthropic agreed in late September to pay about $3.4 billion for 1.7 gigawatts of gas-fired generators. It did not order them from Caterpillar. It took over orders that a small Texas company called OnePWR Solutions had placed about two years ago and needed money to finish paying for. The FT calls it the largest known purchase of power equipment by any AI lab.

Anthropic did not comment. Neither did OnePWR. But I found the receipt. Piper Sandler, the investment bank, lists on its own website a September 2026 deal in which it advised OnePWR on the sale of "its power generation platform to a frontier AI lab" for $3.4 billion. There is one frontier AI lab that was named by the FT, and the number matches to the dollar.

Here is my take. This is the company that put safety in its name and promised in February that it would not leave American ratepayers to pick up the tab for its data centers. It kept that promise the only way the hardware market allows right now: by buying its own gas plants. And it told investors it would do exactly this, in a filing six days before the FT found the deal.

What did Anthropic buy from OnePWR?

Not a company. Commitments. OnePWR ordered heavy-duty gas generators from Caterpillar around late 2024. By 2026 it needed money to finish paying for them. Anthropic had planned to be OnePWR's customer and buy the power. Instead it took over the orders, plus the engineering and building work to install the machines. None of OnePWR's people moved to Anthropic.

That matters because of the queue. Caterpillar told investors on 29 October that it has a record backlog, and its power generation sales grew 30 percent in one quarter to $3.4 billion, "primarily in data center applications". Reports from the industry say Caterpillar is now taking orders for its large engines with delivery in 2029 and for turbines into 2030. An order placed in 2024 sits near the front of that line. Anthropic paid $3.4 billion for a place in line.

Do the math and it comes to about $2,000 per kilowatt, with installation. Caterpillar's G3520 gas generator set makes about 2.5 megawatts, so 1.7 gigawatts is roughly 680 of these machines, each the size of a shipping container, each burning natural gas. Where they will go, the FT did not say. Anthropic's filing names new data center leases in Australia and Canada and does not say where. The only Canadian site made public is the one in Nova Scotia, which I come to below.

Anthropic's IPO filing already said this would happen

Nobody has put these two things side by side. Anthropic filed an amended S-1 with the SEC on 2 November, the Monday before the FT story. Page 35 talks about getting compute fast. It says Anthropic "may also elect, or be required, to procure long-lead-time generation and electrical equipment at prices above prevailing market rates". The reason given: so the equipment can be set up faster and free up capacity sooner.

That is a description of this deal. Take over someone else's old orders, pay a premium, skip the queue.

The filing says more. Some of Anthropic's planned data centers "rely on dedicated on-site natural gas-fired generation". Fuel costs pass to Anthropic "without cost caps". Some of its power and data center deals have "initial terms of 20 years with annual escalators" and take-or-pay terms, which means Anthropic pays whether or not it uses the power. Total committed spend is about $895.4 billion. The filing does not say whether the $3.4 billion sits inside that number.

I searched the whole filing for two words. "Emissions" appears zero times. "Net zero" appears zero times. "Natural gas" appears six times. For a company whose founders left OpenAI over how carefully the future should be handled, that count tells you where the priorities sit when the lawyers write things down.

Why not wait for the grid or build solar?

This is the fairest argument for Anthropic, and a few people on Hacker News made it well. Grid connections in the US take five to seven years. Turbine makers are sold out to 2030. Solar and batteries cannot give you 1.7 gigawatts at one site, all day and all night, on a two-year clock. Gas engines are the only thing you can buy today and run in 2028. And in February Anthropic promised to pay for its own grid upgrades and to "bring net-new power generation online" rather than push up neighbors' bills. A gas plant behind its own fence does exactly that. Your electricity bill does not go up because of it.

I accept all of that, and I still think the argument loses. The filing admits the fuel cost is uncapped and runs for up to 20 years. If AI demand flattens in 2030, Anthropic is still paying for gas and still burning it. The February pledge page promised net-new generation, and nine months later the net-new generation is roughly 680 gas engines with no emissions number attached. Google, Microsoft and Meta publish energy and carbon reports every year. Anthropic publishes none. The problem is not that it bought gas. The problem is that it bought gas quietly, before an IPO, without saying what it will cost the air.

The seller's numbers do not add up to 1.7

One more thing I could not get past. On 3 February 2026, OnePWR put out a press release saying it had "more than 400 megawatts" of generation equipment in stock and expected "more than 800 MW" more within 24 months. That is about 1.2 gigawatts. The FT says Anthropic took over 1.7 gigawatts. Either OnePWR kept ordering through 2026, or the deal includes something else. In March, Caterpillar, OnePWR and a carbon capture company called Vero3 announced a 500 megawatt gas-plus-capture project due to launch this year. 1.2 plus 0.5 is 1.7. That is my arithmetic, not a confirmed fact, and nobody from the three companies has explained the gap.

And OnePWR itself? Its website today shows a single page that says "Maintenance Mode" and "Coming Soon". A company that closed a $3.4 billion sale in September has no public face in November.

The towns are already saying no

The timing could not be worse for Anthropic. On 3 November, US voters decided 41 local ballot measures about data centers. Ballotpedia counts at least 50 of them this year across 13 states. The side that wanted limits won nearly all of them. Anthropic's own filing says opposition to data centers "has become more organized and coordinated". It adds that its public profile "may draw particular attention to projects associated with us".

It already has. In Nova Scotia, Anthropic signed a 20-year lease on a data center that EverWind Fuels wants to build at Point Tupper in Cape Breton. It starts at 95 megawatts in late 2027 and grows to 420 megawatts. On Saturday 7 November people rallied in seven towns across the province, from Halifax to Sydney. They asked Premier Tim Houston to pause it. A petition against the project passed 28,000 signatures. The Halifax Examiner counted about 2,000 people at the Halifax rally alone. One banner on the fence of the legislature read "First the libraries, now this."

The Nova Scotia plan says wind power, not gas. But the people marching were not reading the filing. They were reading the headline that the company behind their new neighbor is buying gas engines by the gigawatt.

What this means for India

Anthropic opened its first Indian office in Bengaluru in February. It says India is Claude's second-largest market. Its filing names data center leases in Australia and Canada, and nothing in India. So the gas engines are not coming here. Your Claude requests from Mumbai or Delhi will keep running on power made in other countries.

Here is the number to sit with. India's entire data center fleet today is about 1.5 gigawatts. Anthropic bought 1.7 gigawatts of generation for itself in one deal, more than every data center in India uses put together. At India's rate of use, that is electricity for more than 12 million homes, locked behind one company's fence. When Reliance and Adani build their AI campuses, they are promising dedicated clean energy plants, not gas. Watch whether that holds once their delivery dates get close.

My prediction

Anthropic, and Dario Amodei as its CEO, owns this choice. My prediction: by 30 June 2027, Anthropic will publish its first energy or emissions report that gives a number for its data centers' electricity use or carbon output. The IPO roadshow will force the question and the gas deal makes it impossible to dodge. If I am wrong, I will say so here.

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