Australia / Site
S4 Sydney Data Centre · S4 Horsley Park · NEXTDC S4 Data Centre Horsley Park
NEXTDC hyperscale and colocation development in western Sydney, with construction underway and completion advertised for 2027. The operator markets 365 MW IT capacity; planning and contractor figures require scope reconciliation. No operational capacity has been established.
Statements retain their dates, definitions and development scope. Do not add these rows together.
| Claim / measurement | Scope and status | As of | Evidence and accounting |
|---|---|---|---|
| 365 MW IT load | Advertised S4 development capacity Planned · cumulative | 2026-10-09 | Reported claim ↗ Excluded from capacity totals. Undated live operator page; as_of is retrieval date, not commissioning or publication date. No evidence of delivered capacity. |
| 300 MW IT load | S4 Lot 305 community information Planned · unclear | 2026-10-09 | Conflicting claim ↗ Excluded from capacity totals. Retrieval date of undated operator page. Differs from current 365 MW facility marketing; scope and freshness unresolved. |
| 300 MW Unspecified power | Original S4 target subject to development approval Planned · cumulative | 2021-07-29 | Reported claim ↗ Excluded from capacity totals. Announcement date; historical development target, not actual commissioned load. |
| 294 MW Facility power | Amended SSD-63741210 development power consumption Planned · cumulative | 2025-12-24 | Reported claim ↗ Excluded from capacity totals. Signed assessment/determination date. Facility consumption must not be combined with IT-capacity marketing figures. |
| 232 MW Facility power | Original EIS proposal power consumption Planned · cumulative | 2024-06-20 | Reported claim ↗ Excluded from capacity totals. Date of original EIS explicitly identified in assessment report; superseded by amended 294 MW consumption. |
| 250 MW Unspecified power | Planning portal synopsis operational capacity Planned · unclear | 2026-10-09 | Conflicting claim ↗ Excluded from capacity totals. Retrieval date. Operational describes proposed capacity, not proof the site is operating. Synopsis also retains six buildings, unlike amended assessment configuration. |
| 350 MW Unspecified power | Multiplex S4 project headline Under Construction · unclear | 2026-10-09 | Conflicting claim ↗ Excluded from capacity totals. Retrieval date of undated contractor page. Unclear whether headline covers full campus or construction package. |
| 350 MW IT load | S4 capacity reported at construction commencement Under Construction · unclear | 2026-03-30 | Conflicting claim ↗ Excluded from capacity totals. Industry article publication date; differs from current operator 365 MW IT marketing. |
NEXTDC announced the Horsley Park development and original capacity target, subject to approval.
Supporting source ↗SSD-63741210 received NSW approval.
Supporting source ↗DCD reported Multiplex had announced official commencement; exact start day was not established.
Supporting source ↗Modification 1 approved changes to ancillary infrastructure, acoustic walls, fuel storage and landscaping.
Supporting source ↗Multiplex project page advertises 2027 completion; commissioning scope remains unclear.
Supporting source ↗Operator description; the original announcement used the same figure for land area. Area definitions require reconciliation.
Source ↗Historical broader site claim; do not equate with approved Lot 305 area.
Source ↗Assessment report distinguishes the site from external HV route and substation works.
Source ↗Includes 56,464 m² data halls and 5,231 m² offices; not equivalent to advertised technical space.
Source ↗Contractor package description; relationship to full approved GFA unresolved.
Source ↗Planning infrastructure; voltage does not establish grid capacity in MW.
Source ↗Design targets, not measured operating performance.
Source ↗Operator marketing; no site-specific carrier list independently established.
Source ↗Source attribution does not imply independent verification or permission to reuse images.
Published Date unavailable · Retrieved 2026-10-09
Operator identifies Horsley Park, development status, 365 MW IT capacity, 124,000 m² technical space and target Tier IV certification; intended customers include hyperscale providers, enterprises and government.
Published Date unavailable · Retrieved 2026-10-09
Operator approval-document index reports approval and mobilisation; its community information still displays 300 MW IT capacity and development status.
Published Date unavailable · Retrieved 2026-10-09
NSW project SSD-63741210 in Fairfield City; approved 24 December 2025. Portal synopsis reports six buildings and 250 MW operational capacity.
Published Date unavailable · Retrieved 2026-10-09
Published December 2025; signed determination 24 December 2025. Identifies 16 Johnston Crescent, amended consumption of 294 MW versus original 232 MW, 8.206 ha site, 61,695 m² GFA, 24 data halls and HV connection works.
Published 2021-07-29 · Retrieved 2026-10-09
Announces securing a Horsley Park site approximately 42 km west of Sydney CBD; approximately 124,000 m² land and target 300 MW subject to approval. Contains conceptual property renderings.
Published Date unavailable · Retrieved 2026-10-09
Builder identifies NEXTDC as client, NSW Australia, under-construction status, 2027 completion, 350 MW headline and a 30,743 m² facility across two four-storey buildings.
Published 2026-03-30 · Retrieved 2026-10-09
Industry report attributes official construction commencement to Multiplex and reports 350 MW IT capacity at S4 Horsley Park.
Published 2025-12-24 · Retrieved 2026-10-09
Public copy of NEXTDC release confirms State Significant Development approval for S4 Horsley Park, New South Wales, reference SSD-63741210.
Published 2023-10-16 · Retrieved 2026-10-09
Earlier address 3–5 Johnston Crescent; proposed Lot 305, excluding Lot 306. CSR Limited owned the land at that time, with NEXTDC purchase settlement anticipated at end-2023; identifies Johnston Crescent and Burley Road frontages.
Published Date unavailable · Retrieved 2026-10-09
Operator includes S4 in Sydney colocation portfolio, gives Horsley Park NSW 2175 and 365 MW target IT capacity. S4 certifications are targets and PUE remains in planning.
Published Date unavailable · Retrieved 2026-10-09
Modification SSD-63741210-Mod-1 approved 7 August 2026; changes concern pump/fire buildings, water tanks, acoustic walls, fuel storage and landscaping.
Name: S4 Sydney Data Centre; NEXTDC S4 Data Centre Horsley Park
Aliases: S4 Sydney Data Centre; NEXTDC S4 Data Centre Horsley Park
Kind: NEXTDC announce a new 300MW facility for Sydney; SEARs Request — NEXTDC S4 Data Centre — Horsley Park
Country: NEXTDC S4 Data Centre — Hyperscale Digital Infrastructure
Region: NEXTDC S4 Data Centre — Hyperscale Digital Infrastructure; S4 Sydney Data Centre Development Approval — ASX Release
City: S4 Sydney Data Centre; NEXTDC S4 Horsley Park — State Significant Development Assessment Report
Metro: NEXTDC announce a new 300MW facility for Sydney; NEXTDC S4 Data Centre — Hyperscale Digital Infrastructure
Address: NEXTDC S4 Horsley Park — State Significant Development Assessment Report; Sydney Data Centres — Colocation & Cloud Connectivity
Operator: S4 Sydney Data Centre; S4 Sydney Data Centre Development Approval — ASX Release
Business Model: Sydney Data Centres — Colocation & Cloud Connectivity
Scale: S4 Sydney Data Centre; NEXTDC S4 Data Centre — Hyperscale Digital Infrastructure
Statuses: S4 Sydney Data Centre; NEXTDC S4 Data Centre — Hyperscale Digital Infrastructure
Summary: S4 Sydney Data Centre; NEXTDC S4 Data Centre Horsley Park; NEXTDC S4 Horsley Park — State Significant Development Assessment Report; NEXTDC S4 Data Centre — Hyperscale Digital Infrastructure
Location: NEXTDC S4 Horsley Park — State Significant Development Assessment Report; SEARs Request — NEXTDC S4 Data Centre — Horsley Park
Stable identifier: 0d2610ec-2f9f-49da-b47d-eaf682e5fe2d