ST Telemedia Global Data Centres (STT GDC) announced on 17 June 2026 that it had opened STT Seoul 1, its first data centre in South Korea: a 30 MW facility in western Seoul built through a joint venture with Korea's Hyosung Heavy Industries. It is modest by hyperscale standards, but the timing is notable. Within the same fortnight, two other Singapore-linked data-centre platforms — Digital Edge and Keppel — also moved on Greater Seoul projects. The common thread is not a sudden shortage of tenants; it is the scarcity of powered sites in one of Asia's tightest data-centre markets.

Three Singapore moves in two weeks

The moves came in quick succession. On 8 June, Stonepeak-backed, Singapore-headquartered Digital Edge announced it had acquired a fully powered land parcel in Ansan's Sihwa National Industrial Complex to develop SEL5, a 60 MW facility that will be its fifth in the country, backed by a 90 MVA power agreement it called one of the largest in Ansan. The next day, Keppel said its private fund, Keppel Data Centre Fund III, had taken a roughly 73% effective stake in a vehicle developing a separate 60 MW project in Ansan — Keppel's first investment in South Korea, targeted for service in 2030. Together the two Ansan projects represent about 120 MW of planned capacity, on top of STT GDC's now-operational 30 MW in Seoul.

These are established regional platforms, not single-asset entrants. STT GDC runs more than 100 data centres across roughly a dozen markets; Keppel operates 39 facilities with over 800 MW of gross power; Digital Edge says it has 1.8 GW of secured IT power across nine Asia-Pacific countries. All three are extending an operating model honed elsewhere into a market they have decided is worth the effort — and, in Digital Edge's case, deepening a footprint that already runs to five Korean sites.

Into a market that is already tight

What makes the timing notable is that South Korea — and Greater Seoul in particular — is not short of demand; it is short of room. The tightness is most acute in the Seoul Metropolitan Area, where enterprise and cloud demand cluster, which is why Ansan, just outside Seoul, matters. JLL put the area's vacancy rate at 1.4% as of March 2026, a figure Keppel cited alongside its own observation that the entire 2025–2027 supply pipeline is already fully pre-leased and that new supply is constrained by regulatory limits on power-supply applications for projects above 10 MW. Digital Edge's chief executive John Freeman framed his Ansan deal as having "secured large-scale power in a highly constrained market" — language that tells you the scarce input is electricity, not tenants. Keppel itself projects that new data-centre power demand in the Seoul Metropolitan Area could reach roughly 2.3 GW by 2030.

That scarcity has a political edge. CBRE noted earlier this year that Korea faces headwinds from community concerns about the impact of data centres on energy supply, which have forced pauses to several developments. The practical consequence is that the projects most likely to proceed are the ones that arrive with power already locked in — a fully powered parcel, a signed power agreement, secured grid approvals. Both Ansan sites were chosen precisely because the power question was already answered; without that, the land is not buildable on a useful timeline.

Why Singapore operators, and why now

The pattern fits a wider reordering of Asian data-centre capacity. Singapore caps new build at home and allocates it through tightly controlled calls, which has pushed its largest operators to grow by exporting capability — disciplined delivery, hyperscale standards, capital relationships — into markets with more physical headroom. South Korea is an unusual target in that it has little headroom either, but it pairs scarce supply with deep enterprise demand and a national push on AI, so the operator that can actually secure power captures a premium.

The corporate backdrop reinforces the expansion logic. STT GDC is itself in the middle of an ownership change: in February 2026, a KKR-led consortium that includes Singtel agreed to acquire the remaining 82% stake in the platform for S$6.6 billion (about US$5.1 billion), implying an enterprise value of about S$13.8 billion (about US$10.9 billion). On completion, KKR will own 75% and Singtel 25%, subject to regulatory approvals. The Korea entry is the kind of footprint expansion buyers paying for a regional platform expect to see.

Key Takeaways

  • STT GDC opened STT Seoul 1 (30 MW, western Seoul) on 17 June 2026 — its first South Korea data centre, via a joint venture with Hyosung Heavy Industries.

  • Days earlier, Digital Edge (8 Jun) and Keppel (9 Jun) each took on separate 60 MW Ansan projects, adding about 120 MW of planned Greater Seoul capacity; SEL5 is Digital Edge's fifth Korean site.

  • The Seoul Metropolitan Area is acutely tight: JLL put vacancy at 1.4% (March 2026), the 2025–2027 pipeline is fully pre-leased, and power-application limits above 10 MW curb new supply.

  • STT GDC is being acquired by a KKR-led consortium with Singtel — about S$13.8 billion (~US$10.9 billion) enterprise value, agreed Feb 2026, closing expected H2 2026 — context for the platform's expansion drive.