Google Waltham Cross · Cheshunt, UK

Last change recorded — · Last checked 2026-10-05

OwnerGoogle

UsersGoogle DeepMind

IT power, end of 202688 MW

Planned end state88 MW

First power2025-09-01

Build-out completeno further build-out tracked

Power pathNo data yet

Binding stepNo data yet

First power vs announcedNo announced date on record

Full build-out vs announcedNo announced date on record

Utility / power partnersUK Power Networks (verify)

Recorded readiness — 0 of 5 applicable milestones have a dated public record

○ Land○ Permits○ Grid supply· Generation○ Water· Financing○ Construction

Gate to first power — target 2025-09-01 (estimate) · path: unknown, generic steps assumed · each step must finish its lead time before the target

0 of 0 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.

No dated steps on record.

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)

2025-09-01 First powerFirst power (Epoch) · ◐

Build-out timeline (Epoch AI; dated status notes with IT power; rows after today are estimates)

2024-01-01—Land clearing begins (Sentinel-2 imagery).

2025-09-0188 MWBuilding complete and operational; full buildout reached. Sentinel-2 imagery shows the building finished with components installed and cars in the car park. Confirmed by Google's official blog post announcing the Waltham

2026-04-2388 MWFull buildout reconfirmed via high-resolution Pléiades-Neo satellite image; no capacity change since September 2025.

Recorded fact The site is energized.

Calculated requirement Energized; watch the build-out timeline for the next buildings.

Sources (Epoch AI selection): Google — Waltham Cross data centre page · Google opening announcement (Sept 2025) · Project Saracen scoping report (Broxbourne planning application ref 07/18/1181/O) · Planning application description (CPRE Hertfordshire)

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 google-waltham-cross; include the row and a source link).