Covered, not verified

Three dead hydrants. No alarm. No suppression system. When a building at the Lake Mariner data center in Somerset, New York caught fire in June, the Barker Fire Department went in without knowing what was burning, because the safety sheets that would have told them were, the company says, inside the building. Ars Technica's Sept. 6 feature on the site is nominally about the corporate web behind a $3.2 billion AI campus. It is really about one question the web was built not to answer: who owns the hydrant.

Count the parties. TeraWulf owns and operates the campus on land leased from a company its own CEO owns. Fluidstack, a UK firm, will run it. Google holds warrants for a future 14 percent stake and guarantees Fluidstack's lease. Anthropic buys the compute. Five entities, a former coal mine, 500 megawatts. Two months after the fire, the fire chief says the hydrants are still dry.

The easy reading is that this is sloppy. It isn't. Each party at Lake Mariner has bought off exactly the exposure it cares about, and the structure is working as designed. Anthropic published a covenant in February to cover ratepayer costs from its data centers, and Lake Mariner is covered under it. Google sets one of the strictest clean-power standards in the industry for its own facilities, matched hour by hour. TeraWulf, after some prodding, accepted responsibility for "operational safety and emergency preparedness." Every layer is accountable for the thing it chose. The residual, the thing nobody chose, is what the fire department walked into.

Covered but not verified. That phrase is the whole piece. TeraWulf's 2024 sustainability report called the site 95 percent zero-carbon. Its April 2026 policy pairs every "zero-carbon" with "low-carbon" and a separate disclosure says 91 percent. Ask how that number is checked and the answer is that it isn't a contract, it's the regional grid mix, and TeraWulf buys no certificates because, in its words, electricity at a grid-connected facility "cannot be traced to a particular generator." The Power Authority spokesperson says the same thing more plainly: an electron from a hydro plant is not hydropower unless someone holds the attribute. Nobody at Lake Mariner holds the attribute. The claim floats.

The tell is what Anthropic did next. On July 6 TeraWulf announced a 20-year, $19 billion lease with Anthropic for a Kentucky site, and the CEO told Bloomberg it was "one of the first things they've gone direct on." No Fluidstack, no Google backstop. At a site it controls, Anthropic writes the terms. At Lake Mariner it has a pledge and no mechanism. The company that most wants its compute to be clean and safe chose the structure where it can see the least, because that structure was available first and cheapest. That is not a moral failing. It is what a lease is.

Every layer is accountable for the thing it chose. The residual, the thing nobody chose, is what the fire department walked into.

The skeptic will say this is how every industrial project has been financed for a century. Refineries, power plants, and pipelines all sit inside special-purpose entities with a landlord, an operator, a guarantor, and an offtaker, and the world has not burned down. True. But those industries carry decades of regulation that attaches to the physical asset regardless of who is on the cap table: a refinery's fire code does not care who guarantees the lease. Data centers were permitted as warehouses with big electrical service. The obligations that do exist run to the entity, and the entity is the thin one. New York's answer so far is a moratorium on new permits above 50 megawatts, which does nothing for a 500-megawatt site permitted before the order, and an unsigned omnibus bill.

The fix is not another pledge. It is making the tenant's covenant run with the building. If Anthropic's ratepayer commitment covers Lake Mariner, its verification should too: a right to audit the power attributes, the safety systems, and the hydrant pressure, written into the lease it signs with whoever sits between it and the concrete. The party with the most to lose reputationally is the one with the least standing to inspect. That is fixable in a contract, and no one has to wait for Albany to fix it.

Ars closes on the fire chief. "If there's no hydrant for me," Steve Matisz said, "that fire is going to burn under their asses." He is right about the fire. He is wrong about the pronoun. There is no "their." That is the design.