AI XPV Platform · Barker, New York

Anthropic Lake Mariner

49MW

The power of 40,000 US homes.

Drawing power since May 2026. Projected to reach 441 MW by Mar 2027.

Capital cost
$1.6B
Chips
TPU v7
Users
Anthropic
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Power over time

facility power · 6 milestones
Every milestone
  1. 11 Jun 2025 — Land clearing begins for Building 1 (AKA CB3).
  2. 2 Mar 2026 — 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.
  3. 31 May 2026 49 MW 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.
  4. 23 Jul 2026 49 MW 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.
  5. 31 Oct 2026 · projected 245 MW Building 2 (AKA CB4) is operational. On February 26, Terawulf stated that CB4 was expected to be energized by Q3 2026.
  6. 31 Mar 2027 · projected 441 MW 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.

Every step Epoch planned here on 2 Sep 2026 is still on plan. Planned against reached

Gas made 54% of the power on this site's grid

net generation by fuel · Oct 2025 to Sep 2026

New York Independent System Operator NYIS · balancing authority

  1. Gas 54%
  2. Coal 0%
  3. Nuclear 19%
  4. Wind 5%
  5. Solar 0%
  6. Hydro 18%
  7. Other 3%

The grid of the utilities that serve Niagara County, NY. Each grid is a balancing authority. Generation only; imports are excluded. Every grid behind an AI site.

Owners plan 333 MW of new power in Niagara County, all solar

power plants in Niagara County · EIA-860M, September 2026
  1. Oxbow Hill Solar · 140 MW · May 2029 · proposed · Cypress Creek Renewables
  2. Somerset Solar LLC Solar · 100 MW · Oct 2029 · proposed · AES Clean Energy
  3. Bear Ridge Solar · 93 MW · May 2028 · proposed · Cypress Creek Renewables

In service in Niagara County today: 3.1 GW. Since January 2023: 42 MW added, 0 MW retired. A plant in the same county does not mean it feeds the site. Power plants near every AI site.

Sources

selected by Epoch AI
  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

Data: Epoch AI, “AI data centers”, CC BY 4.0, retrieved 22 Oct 2026. Facility power adds cooling and other overhead to the IT power the servers draw. Placed at the centre of Barker. Grid: U.S. Energy Information Administration, Hourly Electric Grid Monitor (Form EIA-930), public domain, retrieved 16 Oct 2026; utilities by county from Form EIA-861 and the U.S. Census Bureau Geocoder, public domain. Power plants: U.S. Energy Information Administration, Form EIA-860M, public domain, inventory as of September 2026. All sources.