TL;DR

Digital infrastructure company and former Bitcoin miner TeraWulf has signed a 20-year lease with Anthropic for a purpose-built AI infrastructure campus at its Justified Data site in Hawesville, Kentucky. Anthropic is the public benefit corporation behind the Claude AI assistant and model family.

The agreement gives Anthropic a long-term source of future high-performance computing capacity. For TeraWulf, whose business has roots in bitcoin mining, the lease is a major test of whether power-heavy digital infrastructure can be converted into predictable AI data center revenue.

TeraWulf says the lease is expected to generate about $19 billion of contracted revenue over its initial term. The campus is planned for approximately 401 megawatts of critical IT load, meaning power allocated to computing equipment such as servers, storage, and networking rather than general building overhead.

The capacity is not online yet. According to TeraWulf’s SEC filing, delivery is expected to begin in phases in late 2027 and conclude in early 2028. Anthropic’s rent obligations begin only when the applicable leased premises are delivered, and the 20-year lease term runs from that delivery point. Anthropic also has options to extend the lease for up to 10 additional years through two five-year renewals.

What Anthropic Gets From the Lease

For Anthropic, the Kentucky lease adds another external infrastructure source for AI workloads at a time when AI frontier labs are trying to lock in power, data center space, chips, and cooling capacity years in advance. Earlier questions around SpaceX-linked capacity for Claude showed how the duration and reliability of compute commitments matter to enterprise customers.

The Hawesville agreement is different from a short-term capacity boost or a new Claude product launch. It is a long-duration infrastructure lease whose value depends on whether TeraWulf can deliver the site on schedule and whether Anthropic’s workloads can be supported at the required density, reliability, and cost.

That makes the lease strategically important but operationally unfinished. The contract sets the commercial framework; the campus still needs the physical systems that make AI capacity usable, including power distribution, server halls, networking, cooling, controls, and supporting infrastructure.

Why the Deal Matters for TeraWulf

TeraWulf’s opportunity is to turn access to large power sites into long-term AI infrastructure revenue. Bitcoin miners have broadly been adding AI-related business lines as artificial intelligence demand increases the value of power, land, and data center operating experience.

The Anthropic lease gives TeraWulf a named customer and a large expected revenue stream, but it also raises the execution bar. Investors are no longer judging only whether the company can secure power and announce customers. They are now judging whether it can finance, build, and operate a large AI campus on a fixed timeline.

That is why the market reaction was sharp. TeraWulf shares rose on the announcement as investors reassessed the company’s AI infrastructure prospects, though the initial rally moderated by the end of the trading day.

The deal also fits a wider outsourcing pattern. Microsoft’s $9.7 billion AI infrastructure agreement with IREN showed how mining-linked power assets can be redirected toward enterprise AI workloads. TeraWulf’s lease with Anthropic applies the same question to a new site: can former or adjacent mining infrastructure become dependable AI capacity at scale?

Abernathy Sale Helps Fund the Shift

Alongside the Anthropic lease, TeraWulf said it is selling its 50.1% ownership interest in the Abernathy Joint Venture to a Fluidstack-led investor group. Abernathy is a separate Texas AI data center joint venture formed in 2025 to develop a 168-megawatt critical IT load campus.

The distinction between invested capital and sale proceeds matters. TeraWulf says the transaction monetizes its approximately $450 million investment at a premium. Its SEC filing gives the transaction’s aggregate consideration as approximately $530 million, payable in three installments: $250 million within 14 days of signing, $150 million by December 31, 2026, and about $130 million, subject to adjustments, by April 30, 2027.

The sale reduces TeraWulf’s exposure to a separate joint venture and frees capital for sites where it expects to keep direct ownership, customer relationships, and operational control. In practical terms, Abernathy helps finance the same strategic pivot that the Anthropic lease is meant to validate.

Local Questions Remain in Hawesville

The Justified Data campus would reuse the former Century Aluminum smelter site in Hawesville. The plant has been idle since 2022, when operations stopped and more than 600 jobs were eliminated. Local officials have said the data center is expected to create about 100 to 120 permanent jobs, far fewer than the smelter once supported but still significant for the county.

Power demand, water use, and noise remain the main local issues. The site’s heavy industrial zoning and existing electrical infrastructure reduce some approval hurdles, but they do not remove community concerns about how the facility will operate once it reaches scale.

TeraWulf has agreed to complete a noise study before the facility begins operating and to repeat the study after it is online. That follow-up matters because projected sound levels from cooling systems, transformers, fans, and backup equipment can differ from real-world operating conditions.

The company also plans to use closed-loop cooling, which recirculates coolant instead of continuously drawing new water from local supplies. That design may reduce water consumption compared with some cooling approaches, but the site will still need to prove its actual power, water, and noise profile after operations begin.

Hardware and Supply Chain Choices Are Still Open

Anthropic has not publicly specified which chips it will use at the Hawesville facility. That choice matters because GPUs, custom accelerators, and networking systems all affect rack density, power distribution, cooling needs, procurement schedules, and operating cost.

The hardware decision also affects TeraWulf’s delivery risk. Strong AI server demand through 2027 has kept pressure on equipment supply chains, making delivery schedules a central part of the investment case for large AI infrastructure projects.

Credit support is another open detail. TeraWulf’s filing says Anthropic’s payment obligations are expected to be supported by an investment-grade credit, but it does not identify the supporting entity. That leaves investors to watch not only the construction timeline, but also the final financing and guarantee structure behind the lease.

The Next Test Is Delivery

The first major milestone is the initial service window in the second half of 2027. If TeraWulf hits that target, the Hawesville campus can begin converting a signed lease into operating AI infrastructure revenue. If the schedule slips, the company’s AI pivot will remain dependent on unfinished construction, unresolved equipment choices, and the final economics of bringing 401 megawatts of critical IT load online.

The deal is therefore both a breakthrough and a test. Anthropic has secured a path to future capacity, and TeraWulf has secured a marquee AI customer. The hard part now is turning the contract into a working campus.