Anthropic Lake Mariner · Barker, NY
Last change recorded 2026-10-05 · Last checked 2026-10-04
Latest: Fluidstack leases totalling 360 MW ($6.7bn contracted) with Google backstop; CB-5 expansion lease · Financing closed · 2026-06-30 · recorded 2026-10-05
TeraWulf's Lake Mariner campus at a former 700 MW coal-plant site in Barker, NY. Fluidstack leases 378 MW of critical IT (August 2025), with Google credit support. CB-3 delivered by mid-2026 (102 MW revenue-generating). CB-4 in commissioning with phased delivery in H2 2026; CB-5 (160 MW) was announced for operations in H2 2026 and is now targeted for phased delivery from early 2027. · source ● primary, confidence high
Recorded readiness — 3 of 6 applicable milestones have a dated public record
Gate to first power — target 2026-05-31 (estimate) · path: Grid supply · each step must finish its lead time before the target
1 of 1 required steps have a public date. Red = recorded date past the rule-based deadline · grey "no public date" = required step without a record · green = on record in time · context steps never colour.
| Step | Must finish by | Others did it | Known date | Status | Basis | |
|---|---|---|---|---|---|---|
| Site secured (context) | 2025-02-28 (15 mo before) | 13 mo before (n=26) | 2025-08-14 | context | Fluidstack leases 378 MW critical IT · ● | |
| Building ready for IT | 2026-05-28 (0 mo before) | 2 mo after (n=7) | 2026-07-05 | on record in time | CB-3 delivered; 102 MW of revenue-generating IT capacity at Lake Mariner · ● | |
| Full build-out complete (context) | 2027-05-28 (-12 mo before) | — | 2026-12-31 plan | context | CB-5 (160 MW, Fluidstack) due online H2 2026; contracted IT load 360 MW · ◐ | |
| Financing closed (context) | 2025-05-28 (12 mo before) | 12 mo before (n=2) | 2026-06-30 | context | Fluidstack leases totalling 360 MW ($6.7bn contracted) with Google backstop; CB-5 expansion lease · ◐ |
This site is energized; lights only show how its recorded steps compared with the lead times.
Lead-time assumptions
- Site secured 15 months before first power — Land under control and campus announced. Rarely binding; shown for context.
- Permits in hand 0 months before first power — Final air and siting permits. Operators often energize on standard or temporary authorisations and receive the major permit later; flagged only when the permit lands more than 6 months after first power or is missing for an on-site plant.
- Grid supply agreed 9 months before first power — Interconnection or large-load agreement approved. Observed median 7 months before first power; the physical works (substation, lines) run in parallel with construction.
- Substation and lines energized 2 months before first power — Utility delivery point live; final tests before the load is taken.
- New generation online 1 months before first power — Utility plant or on-site plant generating; needed just before energization when the grid cannot carry the load alone.
- Major equipment on site 6 months before first power — Turbines, transformers, switchgear delivered; installation and commissioning take the remaining months.
- Construction started 24 months before first power — Groundbreaking of the building that gives first power. Observed 4-26 months for recent AI campuses; Meta's redesigned campuses took 35-58.
- Building ready for IT 0 months before first power — First building ready for IT. 'Complete' or 'opened' is usually reported after first power; flagged only beyond 3 months.
- Full build-out complete -12 months before first power — All announced buildings operational. Comes after first power by design; context only.
- Water supply secured 12 months before first power — Water rights, municipal agreement or desalination contract in hand. Context only; one of the feasibility items.
- Financing closed 12 months before first power — Project financing, anchor lease or committed capital announced. Context only; not applicable when the owner is a hyperscaler building on its balance sheet.
Dated steps (from the sources; later dates are plans)
Build-out timeline (Epoch AI; dated status notes with IT power; rows after today are estimates)
Recorded fact The site is energized.
Calculated requirement Energized; watch the build-out timeline for the next buildings.
Sources (Epoch AI selection): Terawulf press release with details and timeline for Buildings 1-5 · DCD article suggesting that Fluidstack will deploy Google TPUs at Lake Mariner · Announcement of Anthropic-Fluidstack partnership, including data center(s) in New York
Epoch AI, 'AI data centers', epoch.ai/data/ai-data-centers (CC BY 4.0); coordinates from GeoNames cities500 (CC BY 4.0) and hand-entered places; overrides in tools/project_overrides.csv with their own sources. Campuses outside the Epoch dataset come from tools/campuses.csv (public reporting, source per row). Data retrieved 2026-10-05. Report a correction to contact@ailoadmap.com (campus id anthropic-lake-mariner; include the row and a source link).