NEXTDC S4 Sydney – Phase 1

Key facts

Owner / operator

NEXTDC

Location

Horsley Park, New South Wales (NSW)

Stage

Under construction

Capacity (as published)

250 MW approved (SSD-63741210); NEXTDC states 365 MW total planned campus

Expected start

Mar 2026 (ground broken)

Expected completion

Mid-2027 (Multiplex)

Investment value

—

Builder / head contractor

Multiplex

As published: Multiplex (ECI then D&C)

Named contractors by trade

Electrical

• Heyday (Southern Cross Electrical) – electrical & comms works under limited LOA from Multiplex Communications / ICT

Consultants

• HDR – architect
• Greenbox – architect
• WT Partnership – quantity surveyor – certified the NABERS embodied-emissions materials form in the SSD application

As published: Heyday (Southern Cross Electrical, ASX:SXE) – electrical & comms works under limited LOA from Multiplex; architects HDR / Greenbox; WT Partnership (quantity surveyor – certified the NABERS embodied-emissions materials form in the SSD application)

Named suppliers

—

Tender / procurement status

Electrical LOA awarded Jun 2026; Multiplex states 'millions of dollars allocated to procurement from local suppliers'; prefabricated mech plantrooms & electrical switch rooms; on-site 330kV substation

Notes

Approved 24/12/2025. ~1,800 workers at peak. Heyday scope (stage 1): HV switching building, security ops centre, ancillary buildings and 2 of 4 multi-level data hall buildings (~60,000m2 GFA)

Sources

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Last updated

2026-11-13