Data Center Atlas
SK AI Data Center Ulsan
Under construction
Korea, Republic of · 1 project · Last reported
Summary
SK Telecom and other SK Group companies are building an AI data center with Amazon Web Services on a former SK Chemicals site in the Mipo National Industrial Complex in Ulsan, South Korea. Plans call for a first phase of about 41 MW by November 2027 and about 103 MW by February 2029, with up to 60,000 GPUs and a longer-term aim of gigawatt scale. Power is to come from a nearby LNG-fuelled cogeneration plant. Construction began with an August 2025 groundbreaking. In August 2026 SK Telecom agreed to move SK Broadband's data center business, including the Ulsan build, into a new company, SK Horizon, backed by KKR and an IMM-Stonebridge consortium, subject to approvals.
Source record as of 2026-09-14 · Details and sources
Location
The interactive map needs JavaScript. Display anchor: 35.53920, 129.31190 (Point locator, WGS 84).
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State or region reference only; the facility position is not established.
Projects (1)
SK AI Data Center Ulsan
Under construction last observed as of · Reported status
Location: Ulsan, KR. Sources place the site in the Mipo National Industrial Complex in Ulsan without an address, and the complex could not be geocoded; coordinates are the OpenStreetMap Nominatim centroid of Ulsan Metropolitan City. AMCHAM Korea / The Chosun Daily; iTnews Asia; Construction Review Online
Use: Ai unspecified, Cloud
Capacity, investment and other figures
| Measure | Value | Scope | As of | Notes | Sources |
|---|---|---|---|---|---|
| Power capacity | 41 MW | Planned · Phase · Unspecified · Phase 1 (target November 2027) | 2025-06-16 | A September 2026 report gives about 40 MW for this phase. | AMCHAM Korea / The Chosun Daily; iTnews Asia |
| Power capacity | 103 MW | Planned · Campus · Unspecified | 2025-06-16 | Full initial build targeted for February 2029. | AMCHAM Korea / The Chosun Daily; iTnews Asia; Construction Review Online |
| Power capacity | 100 MW | Planned · Campus · Unspecified | 2025-08-29 | TelecomTV's rounded figure at groundbreaking; other reports give 103 MW. | TelecomTV |
| Power capacity | 1,000 MW | Planned · Campus · Unspecified | 2026-07 | Long-term gigawatt-scale aim without a timeline, first reported in June 2025 and restated by SK Telecom in July 2026. In September 2026 SK's chairman said planned capacity at Ulsan was approaching 900 MW. | AMCHAM Korea / The Chosun Daily; Construction Review Online |
| Accelerators | 60,000 count | Planned · Campus | 2025-06-16 | AMCHAM Korea / The Chosun Daily; iTnews Asia; Construction Review Online | |
| Investment | about 7,000,000,000,000 KRW | Reported · Campus | 2025-08-29 | TelecomTV attributes the 7 trillion won figure to South Korea's ICT ministry. | TelecomTV; Construction Review Online |
| Investment | about 4,000,000,000 USD | Reported · Campus | 2025-06-16 | AWS's expected contribution, per reports citing industry sources; TelecomTV describes it as part of the 7 trillion won total, so the two figures should not be added. | AMCHAM Korea / The Chosun Daily; iTnews Asia; TelecomTV |
| Land area | about 3.6 hectares | Acquired · Campus | 2025-06-16 | Reported as about 36,000 square meters bought from SK Chemicals for 28.3 billion won. | iTnews Asia; Construction Review Online |
Companies and organizations
| Name | Role | Notes | Sources |
|---|---|---|---|
| SK Telecom | Developer | AMCHAM Korea / The Chosun Daily; Korea JoongAng Daily; TelecomTV; Construction Review Online; SK Telecom | |
| SK Broadband | Developer | Named alongside SK Telecom as leading the project and as co-purchaser of the site. | AMCHAM Korea / The Chosun Daily; iTnews Asia; Construction Review Online |
| SK Ecoplant | Builder | TelecomTV; Construction Review Online | |
| Amazon Web Services | Investor | Described as SK's partner in the project and expected to invest about USD 4 billion, according to reports citing industry sources; the companies' own figures were not found. | AMCHAM Korea / The Chosun Daily; iTnews Asia; TelecomTV |
| SK Multi-Utility | Power supplier | Korea JoongAng Daily; TelecomTV | |
| SK Gas | Power supplier | Supplies LNG to the nearby cogeneration plant. | iTnews Asia; Korea JoongAng Daily; TelecomTV |
| Ulsan Metropolitan City | Government | Signed an MoU with SK Telecom on regional revitalization and expanding the site. | TelecomTV; Construction Review Online |
| SK Horizon | Operator | Planned spin-off of SK Broadband's data center business that is to run the Ulsan AI data center under construction; SK Telecom targets establishing it in the first quarter of 2027, pending shareholder and government approvals. | Light Reading; Construction Review Online; SK Telecom |
Timeline
| Date | Event | Actual or planned | Notes | Sources |
|---|---|---|---|---|
| 2025-04 | Site acquired | Actual | iTnews Asia; Construction Review Online | |
| 2025-06 | Announced | Actual | Plans first reported by Korean media citing industry sources in mid-June 2025. | AMCHAM Korea / The Chosun Daily; iTnews Asia |
| 2025-08-29 | Construction started | Actual | Groundbreaking ceremony attended by SK, AWS and city officials. | Korea JoongAng Daily; TelecomTV; Construction Review Online |
| 2027-11 | First operational | Planned | Target for the roughly 41 MW first phase. | AMCHAM Korea / The Chosun Daily; iTnews Asia; Construction Review Online |
| 2029-02 | Other | Planned | Target for expanding the site to about 103 MW in a second phase; SK has since signalled a much larger build-out. | AMCHAM Korea / The Chosun Daily; iTnews Asia; Construction Review Online |
| 2026-08-27 | Other | Actual | SK Telecom signed agreements to spin SK Broadband's data center business, including the Ulsan AI data center under construction, into SK Horizon with 3.08 trillion won of equity from KKR and an IMM Investment-Stonebridge consortium; completion is targeted for the first quarter of 2027. | Light Reading; Construction Review Online; SK Telecom |
Power supply
| Type | Description | Sources |
|---|---|---|
| Other | Power from a nearby LNG-fuelled cogeneration plant run by SK Multi-Utility with fuel from SK Gas, with LNG cold energy proposed for cooling. | iTnews Asia; Korea JoongAng Daily; TelecomTV; Construction Review Online |
Sources for these details
- SK, AWS to build South Korea's largest AI data center in Ulsan (reprint of The Chosun Daily) — AMCHAM Korea / The Chosun Daily; 2025-06-17
- SK Group and AWS to build South Korea's largest AI data centre in Ulsan — iTnews Asia; 2025-06-16
- SK Group breaks ground on AI-only data center in Ulsan — Korea JoongAng Daily; 2025-08-29 · Archived source
- Under the hood of SKT's Ulsan AI datacentre — TelecomTV; 2025-08-29
- SK Telecom creates SK Horizon in $2.2B data center spin-off deal — Light Reading; 2026-08-28 · Archived source
- SK AI Data Center Ulsan: Chairman Says Site Nearing 900 Megawatts — Construction Review Online; 2026-09-14
- SK Telecom Launches AI Data Center Infrastructure Company 'SK Horizon' and Secures Investments from KKR and IMM — SK Telecom; 2026-08-27
- Companies
- Developer: SK Telecom (unknown scope) evidence
- Developer: SK Telecom (unknown scope) evidence
- Developer: SK Telecom (unknown scope) evidence
- Developer: SK Telecom (unknown scope) evidence
- Developer: SK Telecom (unknown scope) evidence
- Developer: SK Broadband (unknown scope) evidence
- Developer: SK Broadband (unknown scope) evidence
- Developer: SK Broadband (unknown scope) evidence
- Builder: SK Ecoplant (unknown scope) evidence
- Builder: SK Ecoplant (unknown scope) evidence
- Investor: Amazon Web Services (unknown scope) evidence
- Investor: Amazon Web Services (unknown scope) evidence
- Investor: Amazon Web Services (unknown scope) evidence
- Power Supplier: SK Multi-Utility (unknown scope) evidence
- Power Supplier: SK Multi-Utility (unknown scope) evidence
- Power Supplier: SK Gas (unknown scope) evidence
- Power Supplier: SK Gas (unknown scope) evidence
- Power Supplier: SK Gas (unknown scope) evidence
- Government: Ulsan Metropolitan City (unknown scope) evidence
- Government: Ulsan Metropolitan City (unknown scope) evidence
- Operator: SK Horizon (unknown scope) evidence
- Operator: SK Horizon (unknown scope) evidence
- Operator: SK Horizon (unknown scope) evidence
Source and location review
- Status source
- SK Telecom creates SK Horizon in $2.2B data center spin-off deal evidence row
Light Reading · published 2026-08-28 · Trade publication - Locator
- State or region reference only · Compiled location reference · admin1 evidence
- Source checks
Not reviewed against imagery not_
reviewed
No imagery review is recorded for this project. Its status rests only on the dated authoritative source. · no independent imagery verificationStatus age at review: 43 days before the data update on 2026-10-27
Location details
- Coordinates
- 35.53920, 129.31190
- Geometry licence
- source-terms-not-recorded
- Use scope
- State or region reference only
- Scope class
- admin1
- Authority
- Compiled location reference
- Source entity
- Project
- Method
- imported_reference_point
- Derivation
- imported_reference_point
- Precision scope
- Sources place the site in the Mipo National Industrial Complex in Ulsan without an address, and the complex could not be geocoded; coordinates are the OpenStreetMap Nominatim centroid of Ulsan Metropolitan City.
- Horizontal uncertainty
Not reported
The source record provides no measured horizontal uncertainty; original coordinate precision and note are preserved.
- Geometry evidence
- c4cbb4ab
A locator places the site on the map. It is not a building footprint, a construction extent or a surveyed boundary unless the use scope is an official boundary, and even then it is a parcel or permit boundary.
Evidence
Sources are linked, not redistributed; each keeps its own terms. An archived copy is a lookup for the Wayback Machine capture nearest the retrieval date and may be unavailable or differ from what was reviewed. Each hash states what it covers; imported factual records are not publisher-page captures.
| Title | Publisher | Roles | Published | Retrieved | Licence | Attribution | Content hash (SHA-256) |
|---|---|---|---|---|---|---|---|
| SK AI Data Center Ulsan: Chairman Says Site Nearing 900 Megawatts Archived copy | Construction Review Online Trade publication | Imported: Geometry, Imported: Record, Imported: Status, Metric: Accelerators, Metric: Investment, Metric: Land Area, Metric: Power Capacity, Milestone: Construction Started, Milestone: First Operational, Milestone: Other, Milestone: Site Acquired, Power Source: Other, Role: Builder, Role: Developer, Role: Government, Operator claim | source-terms-not-recorded | Construction Review Online | 66c7f3feed0b945abf0953d448f7a846acaa268083e5596b93249adf19371098Factual source record; not the publisher page | ||
| SK Group and AWS to build South Korea's largest AI data centre in Ulsan Archived copy | iTnews Asia Trade publication | Imported: Geometry, Imported: Record, Metric: Accelerators, Metric: Investment, Metric: Land Area, Metric: Power Capacity, Milestone: Announced, Milestone: First Operational, Milestone: Other, Milestone: Site Acquired, Power Source: Other, Role: Developer, Role: Investor, Role: Power Supplier | source-terms-not-recorded | iTnews Asia | 564204ca585455c67085d3c94fe0b780ee6a2845d7a4267a6d201ce381c51396Factual source record; not the publisher page | ||
| SK Group breaks ground on AI-only data center in Ulsan Archived copy | Korea JoongAng Daily News | Imported: Record, Milestone: Construction Started, Power Source: Other, Role: Developer, Role: Power Supplier | source-terms-not-recorded | Korea JoongAng Daily | afbcb0fdec98f1466ab4a3098f69f2be352d2d2be16b2e1e8577ef689e5a4cf4Factual source record; not the publisher page | ||
| SK Telecom creates SK Horizon in $2.2B data center spin-off deal Archived copy | Light Reading Trade publication | Imported: Record, Imported: Status, Milestone: Other, Operator claim | source-terms-not-recorded | Light Reading | 46091df288541f5b06fcbabff026d6d85aea725f0447497b954d98574ba59814Factual source record; not the publisher page | ||
| SK Telecom Launches AI Data Center Infrastructure Company 'SK Horizon' and Secures Investments from KKR and IMM Archived copy | SK Telecom Company disclosure | Imported: Record, Imported: Status, Milestone: Other, Role: Developer, Operator claim | source-terms-not-recorded | SK Telecom | 7ef405fdb0cdf509ad36acf7c20e5c1905df85f7c9ab2530f856d1b2fd86875aFactual source record; not the publisher page | ||
| SK, AWS to build South Korea's largest AI data center in Ulsan (reprint of The Chosun Daily) Archived copy | AMCHAM Korea / The Chosun Daily News | Imported: Geometry, Imported: Record, Metric: Accelerators, Metric: Investment, Metric: Power Capacity, Milestone: Announced, Milestone: First Operational, Milestone: Other, Role: Developer, Role: Investor | source-terms-not-recorded | AMCHAM Korea / The Chosun Daily | 3ffc3cdd27ccf75b8e5b4c495a86a3adddc5d38acf2ddf13c90718c8f15b8196Factual source record; not the publisher page | ||
| Under the hood of SKT's Ulsan AI datacentre Archived copy | TelecomTV Trade publication | Imported: Record, Metric: Investment, Metric: Power Capacity, Milestone: Construction Started, Power Source: Other, Role: Builder, Role: Developer, Role: Government, Role: Investor, Role: Power Supplier | source-terms-not-recorded | TelecomTV | 37db69c75399659fc842cac33ab31fd8436e5a4e41abe509f02916a9f4a05994Factual source record; not the publisher page |
Cite this site
Kyars, K. (2026). SK AI Data Center Ulsan [site vcc-site-e8f2d5efccb035e9135a]. In Data Center Atlas (2026-10-27) [Data set]. https://kiankyars.github.io/datacenter-atlas/sites/vcc-site-e8f2d5efccb035e9135a/
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