Netherlands / Site

CyrusOne AMS1

54 MWIT loadUltimate two-building AMS1 campus · 2026-10-09

CyrusOne Amsterdam I · Amsterdam I Data Center · CyrusOne AMS1 - Halfweg

OperationalPlanned

CyrusOne's purpose-built PolanenPark campus in Halfweg serves the Amsterdam market. The operator describes potential ultimate IT capacity of 54 MW across two buildings, rather than confirmed energized capacity. Existing operations are supported by operator service descriptions and historical tenant reporting. A January 2026 permit authorizes building B at Linieweg 3 within a two-data-center campus; its construction and commissioning status remain unresolved.

Last researched 2026-10-09Last verified Not independently verifiedPublished revision 1

No approved site photo yet. Photos and their source dates are published after evidence review.

Site profile

Operator: CyrusOne
Ownership: CyrusOne
Business model / scale: Colocation / Unknown
Region / metro: Noord-Holland / Amsterdam
City / locality: Halfweg
Address: Linieweg 1, 1165 AA Halfweg, Netherlands
Location: PeeringDB facility geocode associated with Linieweg 1, independently corroborated as the operator's street address; marker position and building footprint were not verified. An older syndicated datasheet gives a different nearby point.
Precision: approximate · 52.383057, 4.703489
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Parent: Not assigned

Location detail

PeeringDB facility geocode associated with Linieweg 1, independently corroborated as the operator's street address; marker position and building footprint were not verified. An older syndicated datasheet gives a different nearby point.. Coordinate precision: approximate. Street-map detail does not increase the accuracy of the sourced point.

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Capacity evidence

Statements retain their dates, definitions and development scope. Do not add these rows together.

Claim / measurement	Scope and status	As of	Evidence and accounting
54 MW IT load	Ultimate two-building AMS1 campus Planned · cumulative	2026-10-09	Reported claim ↗ Excluded from capacity totals. Retrieval-date observation of an undated operator page. The narrative explicitly describes potential capacity; this is not evidence of energized load.
60 MW Grid connection	AMS1 active/active A&B mains supply arrangement Unknown · unclear	2026-10-09	Reported claim ↗ Excluded from capacity totals. Retrieval-date observation of an undated datasheet specifying diversely routed 20 kV incomers and 60 MW capacity. Redundancy and per-feed versus total interpretation require review; no energization date is supplied.
≈72 MW Unspecified power	Two-building PolanenPark campus proposed in 2018 Planned · cumulative	2018-12-06	Estimate claim ↗ Excluded from capacity totals. Announcement-date estimated capacity. Basis is unstated; cannot be reconciled automatically with later IT and grid figures.
3 MW Unspecified power	Historical Cyxtera leased portion of the Linieweg campus Operational · incremental	2023-06-09	Reported claim ↗ Excluded from capacity totals. Publication-date tenant footprint, with a proposed subsequent exit. Overlaps campus capacity and does not establish current energized load.

Development timeline

2018-12-06 · announcement
PolanenPark land acquisition announced
SADC announced CyrusOne's purchase of 6.3 hectares for a two-building campus.
Supporting source ↗
2018-12 · actual_construction_start_reported
Construction began
Construction coverage reports works starting in December 2018.
Supporting source ↗
2019-09 · planned_completion
Original construction completion target
Contractor coverage describes September 2019 as the target, not proof of commissioning.
Supporting source ↗
2019-10 · actual_operation_reported
Cyxtera operations reportedly launched
DCD reports operation of a leased portion beginning in October 2019; a directory instead dates first-building operation to 2021.
Supporting source ↗
2020-09-15 · announcement
Waste-heat feasibility agreement
CyrusOne, Haarlem and PolanenPark agreed to study a heat network for 15,000 homes; delivery was conditional.
Supporting source ↗
2023-06-09 · announcement
Cyxtera tenant exit reported
DCD reported plans to reject the AMS1 lease effective September 6, 2023; this does not establish campus closure.
Supporting source ↗
2026-01-23 · actual_permit_decision
Building B permit granted
Permit for a data center at Linieweg 3 within the existing two-data-center campus, applicant CyrusOne AMS3 B.V.; published January 30.
Supporting source ↗

Disclosed specifications

Ultimate technical space

29,350 m² across two buildings

Operator campus potential; not confirmed completed or fitted-out area.

Source ↗

Land acquisition

6.3 hectares

2018 land purchase announcement; current cadastral extent unverified.

Source ↗

Original proposed development area

33,445 m²

2018 proposal; differs in scope and date from current technical-space figure.

Source ↗

Cooling

Ring chilled-water system, N+1 free-cooling air-cooled chillers, circulation pumps N+1

Operator design specifications; no measured PUE or WUE supplied.

Source ↗

Backup power

Distributed redundant UPS with 10-minute battery backup; generators with 48-hour fuel autonomy

Operator datasheet design claims.

Source ↗

Raised floor and clear height

900 mm raised floor; 3,600 mm data-hall clear height

Operator design specification.

Source ↗

Connectivity

Carrier-neutral diverse fiber; A&B meet-me rooms; euNetworks, Zayo and Megaport mentioned

Undated operator datasheet; current carrier availability requires confirmation.

Source ↗

Certification claims

ISO 9001, ISO 14001, ISO 45001, ISO 27001, SOC2 and PCI

Operator datasheet lists compliance certifications; certificates, expiry and scope were not inspected. Tier III is described as design resilience, not independently verified certification.

Source ↗