ST Telemedia Global Data Centres (STT GDC), a global data center provider, has announced the opening of STT Seoul 1, its first data center in South Korea. Developed and operated through a 60-40 joint venture between STT GDC and Hyosung Heavy Industries, the facility aims to support customers deploying AI and cloud infrastructure across Northeast Asia.
Located in Gasan-dong, Geumcheon-gu, Seoul, STT Seoul 1 comprises approximately 40,000 square meters of gross floor area and supports up to 30 MW of IT load, with full commercial operations beginning in June 2026.
The opening ceremony was attended by Jeehye Park, Member of the National Assembly of Korea, and Singapore’s Ambassador to the Republic of Korea His Excellency Wong Kai Jiun, reflecting the importance of digital infrastructure in supporting economic development and cross-border collaboration.
In a press release, the company emphasized South Korea’s strategic importance as a market for high-performance digital infrastructure, underpinned by strong enterprise digitalization and growing demand for compute capacity. “The opening of STT Seoul 1 reflects STT GDC’s broader approach to expanding in markets where long-term digital demand, infrastructure readiness and customer requirements are converging. The facility is designed to support a range of hyperscale and enterprise deployments, including evolving high-density workloads,” it said.
“AI infrastructure demand is increasingly concentrating in markets where digital capability, power availability and customer requirements come together,” said Charles Chulhoy Huh, Country Head, ST Telemedia Global Data centers (Korea). “STT Seoul 1 establishes an important foundation for STT GDC’s presence in Korea, extending a globally consistent platform into a key Northeast Asian market, where customers are scaling increasingly advanced workloads and require infrastructure that is resilient, efficient and built for long-term growth.”
Hyun-Joon Cho, Chairman, Hyosung Group, said, “Over a decade ago, we recognized the value of big data—often referred to as the ‘oil of the 21st century’—and set out with a firm conviction to build core AI infrastructure in the Seoul metropolitan area, the ‘brain’ of Korea. Today, STT Seoul 1 stands as a timely oasis for advanced IT companies that have long faced infrastructure constraints, and a new milestone marking the future of Korea’s AI ecosystem.”
“Given that Korea is aiming to become one of the top 3 global leaders in AI, establishing high-quality, efficient data center infrastructure is a critical national priority,” said Jeehye Park, Member of the National Assembly of Korea. “I look forward to STT Seoul 1 supporting Korea’s journey to becoming a true AI powerhouse by creating a more efficient, professional, and sustainable data center model.”
“Singapore and South Korea share strong and longstanding ties in trade, technology and innovation. As both countries continue to advance their digital and AI capabilities, trusted digital infrastructure will play an important role in enabling deeper connectivity and collaboration,” said Singapore’s Ambassador to the Republic of Korea Wong Kai Jiun. “STT Seoul 1 demonstrates how cross-border collaboration can support the development of resilient digital infrastructure, strengthen regional connectivity and create new foundations for innovation and growth.”
STT Seoul 1 has been built with a strong focus on uninterrupted operations and energy efficiency from the design stage. The facility features dual 22.9kV power feeds with a redundant configuration, together with a distributed redundant (DR) UPS system and backup generators capable of operating for up to 24 hours without refuelling, enhancing operational resilience in emergency situations.
Its cooling system supports a design PUE of below 1.3 and is complemented by thermal energy storage (TES) to enable stable and continuous cooling. STT Seoul 1 also incorporates a seven-layer physical security framework, including intelligent video analytics and biometric authentication, and has achieved LEED Gold certification, reflecting a focus on efficient, high-performance infrastructure. These features position STT Seoul 1 to support customers requiring resilient, efficient infrastructure for mission-critical cloud and AI deployments, while reinforcing STT GDC’s ability to bring consistent engineering and operating standards into new markets.
STT GDC operates a global portfolio of data centers across key markets, including Singapore, the United Kingdom, Germany, India, Italy, Thailand, Indonesia, Japan, the Philippines, Malaysia, Vietnam, and Korea.