Anthropic will not own its datacenters — and says it will absorb the power-bill increase

AI datacenter announcements usually lead with a number. So many billions, so many gigawatts, so many sites. The August 10 announcement from Anthropic, Macquarie Asset Management and Singapore's GIC had none of those. What it had instead was an ownership structure.

The new entity is Theseus Infrastructure. It develops, owns and operates datacenters and leases them to Anthropic under long-term agreements. Anthropic is the anchor tenant — the tenant.

1. Who holds what

Read that table backwards and you can see how AI infrastructure financing is shifting. Until recently, sovereign funds and infrastructure managers bought equity in AI companies. Here they are buying the buildings and the power.

The difference is in how the money comes back. Equity pays off if the company wins. A leased asset pays rent for the term of the contract — a cash-flow shape close to the toll roads and power plants Macquarie has run for decades. It is a bet on the scarcity of land and electricity more than on the outcome of the model race.

2. Why Anthropic chose to be a tenant

Owning datacenters means capitalising the plant and carrying depreciation for years. Frontier model training is already expensive; adding buildings to the balance sheet reduces what is left for the next training run.

Leasing moves that weight onto Macquarie and GIC. In exchange, Anthropic is locked into long-term contracts. If demand forecasts overshoot and the company has committed to more capacity than it needs, that cost does not go away. It sold flexibility to buy financial headroom.

Anthropic is not alone in mixing owned and leased capacity — OpenAI, Meta and Google all do. What stands out is the prominence of a structure where a sovereign fund and an infrastructure manager fund most of the platform equity. It sits at the opposite end from Naver's decision to spend ₩14.6tn building its own "sovereign AI factory" in Sejong, Korea, which this desk covered on August 9.

3. Electricity is the real news here

The most unusual part of the announcement is not the financing but the power commitments. Anthropic said it would cover four things:

• 100% of grid-upgrade costs — transmission lines, substations, everything needed to make the local network accept the load
• New generation to meet its own demand
• Curtailment — systems that cut consumption by up to 30% during grid peaks
• Consumer rate increases attributable to its sites

The background explains the pledge. Datacenter siting has become an electricity-bill fight across several US states, with some jurisdictions slowing interconnection queues or writing separate tariff classes. Power, not land, is now the binding constraint.

Seen that way, this is less a gesture of goodwill than a condition of getting permitted.

4. What remains unverified

A great deal is missing. No total investment figure, no site locations, no capacity in gigawatts, no first-operation date. When an announcement of this kind omits the numbers, it usually means site negotiations or power contracts are not finished.

The electricity pledge also has no visible verification mechanism. Nothing in the announcement explains how "the rate increase caused by our demand" is computed, or whether a regulator checks the computation. After a datacenter arrives and rates rise, apportioning that increase is genuinely hard.

The 30% curtailment figure is a design target rather than a result. Training workloads pause and resume reasonably well; inference serving does not. Which workloads can actually be shed determines whether that promise holds.

The thing to watch is simple: where the first site is announced. Whether it lands somewhere with surplus power or somewhere already fighting about rates will show whether this structure works as described.