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Updated Aug. 24, 2026

Anthropic Lake Mariner

Barker, New York, United States

Anthropic Lake Mariner is an operational AI data center with AI chips owned by AI XPV Platform and likely used by Anthropic. It hosts an estimated 59k H100-equivalents of compute, supported by 42 MW of IT power at a capital cost of $1.6 B. In Q1 2027, we project it to rise to 527k H100-eq compute, 378 MW IT power and a cost of $14.3 B. We estimate that it uses Google TPU v7 chips.

The timeline of IT power and compute capacity is based on satellite imagery, our cooling equipment power model, company disclosures, chip availability, and chip efficiency.

Built at a former coal plant on the shores of Lake Ontario, the Fluidstack-leased buildings are reported to serve Google TPUs for Anthropic.

OWNERAI XPV PlatformSTATUSOperationalUSERAnthropic (likely)
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Satellite view of Anthropic Lake Mariner

Satellite imagery

Latest: Jul. 24, 2026 · 2 high-res images
View satellite explorer →

Scale & specifications

CURRENT COMPUTE

59kH100-eq

1.16e208-bit OP/s

PROJECTED

527kH100-eq

1.04e218-bit OP/s

CURRENT IT POWER

42MW

PROJECTED IT POWER

378MW

CURRENT COST

$1.6B

PROJECTED COST

$14.3B

Buildout

Jun 11, 20250K H100e
Epoch AI|CC-BY
Jun 11, 2025
Satellite explorer

Land clearing begins for Building 1 (AKA CB3).

Mar 2, 2026
Satellite explorer

Building 1 appears to have a complete shell and cooling equipment. Building 2 shell is still under construction, but 17 cooling units are already loaded on the roof. The outline of Building 3 is visible at the foundation.

May 31, 2026
Satellite explorer

Building 1 is operational. On February 26, Terawulf stated that CB3 was expected to be energized by mid-May 2026. A drone video commissioned from RAAD shows several cooling units operating on May 8. It's therefore likely that the building was fully operational around this date.

Compute
59kH100-eq
IT Power
42MW
Cost
$1.6B
Jul 23, 2026
Satellite explorer

Building 1 looks complete, consistent with it going operational back in May. Building 2 is mostly complete, with the row of backup generators on the east side of the building still being installed. Building 3 shell is complete, with rooftop coolers midway through installation, and no neighboring generators installed/visible yet.

Compute
59kH100-eq
IT Power
42MW
Cost
$1.6B
Oct 31, 2026
Projected
Satellite explorer

Building 2 (AKA CB4) is operational. On February 26, Terawulf stated that CB4 was expected to be energized by Q3 2026.

Compute
293kH100-eq
IT Power
210MW
Cost
$8.0B
Mar 31, 2027
Projected
Satellite explorer

Building 3 (AKA CB5) is operational. On February 26, 2026, Terawulf stated that CB5 was expected to be energized by Q4 2026. However, based on the pace of Building 2, and comparisons to other projects like Stargate Abilene, we think this is optimistic. We expect a 3-month delay past the end of Q4 2026 to get to full operational capacity.

Compute
527kH100-eq
IT Power
378MW
Cost
$14.3B

Sources

  1. Terawulf press release with details and timeline for Buildings 1-5
  2. DCD article suggesting that Fluidstack will deploy Google TPUs at Lake Mariner
  3. Announcement of Anthropic-Fluidstack partnership, including data center(s) in New York

Read more about our methodology.