The prospectus Anthropic filed for its initial public offering (IPO) reveals not just financial figures — it exposes a physical reality that the artificial intelligence industry prefers to keep backstage. In a 318-page document submitted to the U.S. Securities and Exchange Commission (SEC), the company explicitly acknowledges that some of its planned data centers will use on-site natural gas turbines to generate electricity, and classifies energy supply as one of the primary risks to its business.
The mention of natural gas is neither accidental nor marginal. The word "energy" appears 14 times in the document's risk section, while "climate" or "climate change" is mentioned four times. What's at stake is structural: Anthropic estimates it will need 2-gigawatt (GW) data centers in 2027 and 5 GW by 2028 to train its frontier models. Several other U.S. AI companies are competing for the same energy resources, and projections indicate total frontier AI demand in the United States will reach 20 to 25 GW by 2028 — roughly twice New York City's peak electricity demand.
The Anthropic Direct strategy
To reduce dependence on competing cloud providers (primarily Amazon and Google Cloud), Anthropic is implementing a strategy called "Anthropic Direct," which involves establishing its own data centers. The company has future fixed or guaranteed minimum payment commitments of approximately $567 billion, of which $265.6 billion are leases for equipment and data centers alone. Of those, $125.2 billion represent lease rentals over five years, excluding interest.
In the Anthropic Direct model, third-party partners secure the land, power, and infrastructure, while Anthropic assumes operational control. But this transition to dedicated data centers carries an energy cost the company doesn't hide: competition for electrical supply and sites with sufficient power capacity is "accelerating costs" and causing "significant construction delays."
The natural gas paradox
The irony is structural. Anthropic, like other AI companies, publicly positions itself as a sustainability advocate. Yet the S-1 reveals that the company openly acknowledges its AI infrastructure depends heavily on fossil fuels. The filing states:
"Our strategy depends on energy and data center partners who share our environmental values." It then admits that "the lack of access to energy, water, or other critical infrastructure" may "significantly delay expansion."
The sectoral context is even more revealing. According to BloombergNEF data, U.S. data centers could consume more natural gas than Germany and Japan combined by 2035 — approximately 18 billion cubic feet per day. In September 2026, Google and Amazon announced plans for new natural gas power plants that bypass the traditional grid, delivering electricity directly to data centers.
Anthropic itself published its "Build AI in America" report in October 2026, which proposes accelerating permitting for geothermal, natural gas, and nuclear power plants as part of a national infrastructure strategy. In a separate post, the company promised to cover electricity price increases that consumers face due to its data centers — but the risk document makes clear the company cannot control the natural gas market.
Financial and regulatory risks
The S-1 details concrete risks: fuel cost increases, equipment delivery delays, stricter environmental regulation, and resistance from local communities. The company explicitly cites "natural disasters, such as California wildfires" as threats to energy infrastructure.
What makes this revelation particularly significant is the timing: Anthropic is preparing to enter the stock market with an estimated valuation of $2.5 trillion (following OpenAI's $1.25 trillion round). Institutional investors, pension funds, and ESG managers are scrutinizing these documents meticulously. The company admits it "may face increased scrutiny" from investors and local communities, but offers no clear plan to mitigate this dependence.
The question that remains is not whether AI will consume energy — that is a settled fact — but who will pay the bill when natural gas runs out or prices skyrocket. Anthropic is building the most ambitious computing infrastructure in history, and the fuel that powers it is still the same one that burned in 19th-century factories.
Sources: Heatmap, Fortune, AI Parabellum
✓ Independent sources cross-checked and verified before publishing
