ST Telemedia Global Data Centre’s STT Seoul 1 Data Centre Achieves Uptime Institute Tier III Certification of Design Documents

Certification validates infrastructure design for concurrent maintainability
 

SEOUL, South Korea, 19 May 2026 – ST Telemedia Global Data Centres (STT GDC), one of the world’s fastest-growing data centre colocation service providers headquartered in Singapore, announced that STT Seoul 1, its first data centre in Korea, has achieved the Uptime Institute Tier III Certification of Design Documents (TCDD). The certification validates the robustness of STT GDC’s data centre infrastructure design, which is engineered to support high availability through concurrent maintainability, with critical power and cooling infrastructure designed to allow planned maintenance activities to be carried out without service interruption.

Uptime Institute is a globally recognised authority on data centre performance, resilience and efficiency. Its Tier Certification programme evaluates data centre infrastructure against defined availability objectives, with certification available across three stages: Design Documents, Constructed Facility, and Operational Sustainability.

STT Seoul 1 is currently under development in Gasan‑dong, Geumcheon‑gu, Seoul, with commercial operations targeted to commence in June 2026. Designed as an AI‑ready facility, the data centre will support up to 30MW of IT load and features a resilient power architecture, including dual 22.9kV power feeds (primary and secondary), distributed redundant UPS systems, and N+1 emergency generators. The facility is also designed with a carrier‑neutral network architecture, dual telecom entry points, a high‑efficiency cooling system, with a targeted design power usage effectiveness (PUE) below 1.3. Fire detection and suppression systems include VESDA‑based early smoke detection and gas‑based fire suppression.

“Achieving the Tier III Certification of Design Documents for STT Seoul 1 is an important milestone as we progress towards operational readiness in Korea,” said Charles Huh, Country Head for STT GDC Korea. “It reflects our disciplined approach to infrastructure design and our commitment to delivering data centre environments that meet globally recognised standards for availability and resilience.”

“Congratulations to ST Telemedia Global Data Centres for achieving the Uptime Institute Tier III Certification of Design Documents award for STT Seoul 1. The Tier Certification of Design Documents provides independent validation of the facility’s engineering and architectural plans against rigorous criteria across critical infrastructure elements. This offers early confidence at the design level that the planned topology is aligned to the project’s availability objectives and is designed for concurrent maintainability. The Tier III Certification of Design Documents award signifies the organization’s commitment to superior design standards and sets the foundation for a Tier Certification of Constructed Facility,” said Philip Hu, Managing Director, North Asia, Uptime Institute.

STT Seoul 1 represents a key step in STT GDC’s long-term expansion in Korea, supporting the growing demand for secure, high-availability digital infrastructure to underpin cloud, enterprise and emerging AI workloads.

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