Hyosung Opens Hyperscale AI Data Center in Seoul

ST Telemedia Global Data Centres (STT GDC) and Hyosung Heavy Industries opened STT Seoul 1, a hyperscale AI data center in Gasan-dong, Geumcheon-gu, Seoul, on June 16, 2026, according to an STT GDC press release and reporting by Yonhap and The Korea Herald. The joint venture, operating as Hyosung-STT GDC, is owned 60% by STT GDC and 40% by Hyosung Heavy Industries, per STT GDC and Business Times coverage. The facility offers up to 30 megawatts of IT capacity and a gross floor area of about 40,000 square metres, as reported by Business Times and SBR. The site has a reported design power usage effectiveness below 1.3 and acquired the Uptime Institute's Tier III Certification of Design Documents (TCDD), per Business Times and Asiae reporting. Hyosung Group Chairman Cho Hyun-joon spoke at the opening; Asiae and Yonhap published his remarks characterizing the data center as a new growth engine for the group.

Reporting describes the facility as built to support high-density cloud and AI workloads with dual 22.9 kilovolt power feeds and backup generators rated to run up to 24 hours without refuelling, per Business Times. STT GDC's press release frames the site as able to host hyperscale and enterprise deployments and to extend STT GDC's platform into South Korea, while Hyosung Heavy Industries is reported to supply power equipment and energy-efficiency technologies and Hyosung ITX to contribute IT and operations capabilities, per The Korea Herald and Yonhap.

Industry pattern observations: Global hyperscale operators and regional industrial groups have been partnering to place capacity closer to major business districts while managing local grid constraints; STT Seoul 1 fits that pattern by locating a 30 MW facility inside Seoul where many large campuses have moved to outskirts, according to The Korea Herald and Asiae coverage. Deploying capacity with a target PUE below 1.3 and Tier III design certification aligns with commercial expectations for enterprise customers demanding resilience and predictable efficiency, a recurrent requirement in recent hyperscale rollouts.

South Korea's data center market is frequently described in local reporting as growing rapidly, with projections cited by The Korea Herald that place the market in the trillions of won by 2030. For multinational operators, entering Seoul addresses customer needs for lower latency and proximity to financial and enterprise hubs such as Gangnam and Yeouido, which multiple sources noted as a differentiator for STT Seoul 1. The joint-venture structure, with STT GDC providing operations experience and Hyosung contributing power and construction expertise, mirrors a common collaboration model seen in Asia when foreign operators scale in markets with constrained local power and regulatory landscapes.

Practitioners evaluating deployment strategies should note two operational trade-offs signaled by the reporting: colocating capacity in dense urban cores reduces network latency but increases dependence on robust local power design and redundancy, and meeting sub-1.3 PUE targets in such locations requires integrated design between power engineering and IT load planning. The public details about dual high-voltage feeds and extended backup runtime are concrete indicators of the facility's intended resilience profile.

Observers can track commercial availability and leasing announcements from STT GDC and Hyosung-STT GDC to assess demand for on-premise versus cloud-hosted AI clusters in Seoul. Industry watchers may also monitor whether the JV expands capacity beyond 30 MW in Korea, and whether other global hyperscale operators pursue similar inner-city builds amid regional grid constraints, as reported by Business Times and STT GDC statements.