Vertiv's PowerNexus integrated UPS block will make its South Korea debut at SGC Energy's 60MW Gunsan AI data centre
SGC Energy said on 8 September that it has signed a memorandum of understanding with Vertiv covering the AI data centre it is developing in Gunsan, South Korea.
The interesting part is not the capacity. It is what is going inside the fence.
Vertiv plans to deploy PowerNexus at the site — the first deployment of the system in South Korea. Instead of delivering the UPS and the switchgear separately and integrating them entirely on site, PowerNexus ships as one factory-assembled block that combines a high-capacity UPS and system switchgear.
For anyone who buys, specifies or maintains UPS systems, that shift deserves more attention than another megawatt headline.
1. What was actually announced
- Who: SGC Energy (KRX: 005090) and Vertiv Holdings.
- What: a non-binding memorandum of understanding to run joint technical reviews of the data centre infrastructure and to cooperate on power and cooling efficiency.
- Where: Gunsan National Industrial Complex 2, on roughly 9,290 m² of land already held by SGC Green Power.
- Scale: 60 MW in the first phase, with a stated path to 300 MW at full buildout.
- Timing: construction start targeted for the fourth quarter of 2026, first-phase energisation for the first quarter of 2028.
The capacity numbers are project ambition. The MoU is an agreement to study things together. Neither is a purchase order.
2. What an integrated block changes
A conventional build separates the power chain: transformer, switchgear, UPS, distribution, batteries. Each piece arrives on its own and gets connected by whoever is running the site.
PowerNexus collapses two of those into one factory-built block. Vertiv puts the gain at up to 70% faster deployment and up to 20% lower installation cost. Those are the vendor's own figures, and no baseline published alongside them — faster than what, measured how, at what capacity, is not stated. Treat them as a claim to test, not a number to design against.
The consequence matters more than the percentages. Once the UPS and the switchgear leave the factory as one assembly, the interface between them stops being a site decision and becomes a product decision. Factory conditions beat a container on a muddy plot, so that is mostly good. It also moves responsibility: who publishes the short-circuit rating for the combined assembly, who proves protective selectivity, what happens to the warranty when the block meets equipment it was never tested with. Ask before delivery, not during commissioning.
The timeline and the capacity are project plans. The speed and cost figures are the vendor's, with no stated baseline.
3. Three questions to ask before buying a block
Can the UPS section be isolated without dropping the load? A maintenance bypass lets a technician de-energise the power electronics while the load stays up. If it sits outside the block, the switchboard layout has to allow for it, and that is easier to design in than to add later.
Will it fit, and where do the batteries sit? A factory-built block is wide, tall and heavy, and the route the cables take after it lands is a site constraint, not a product specification — access is the most common reason a modular design loses the schedule it was supposed to protect. Blocks that carry batteries inside them also put a five-to-ten-year wearing component in the same enclosure as equipment expected to run far longer.
How does it grow, and who owns the interface? Gunsan goes 60 MW to 300 MW on paper. Growing a block-based design means adding blocks, and the DC bus configuration decides whether added capacity parallels cleanly or forces a re-cut of the distribution. Single-supplier integration is only an advantage if one party accepts responsibility for the behaviour of the whole assembly — get that in writing, with the test reports behind it.
What to send a supplier before you ask for a price
A project like this starts with a load list, not a product code. Send the load type and any inrush or step-load behaviour, actual and peak load in kW, input and output voltage with phase configuration, required runtime at a stated load, redundancy architecture (single unit, parallel, N+1 or 2N), site constraints including access route, floor loading, ambient temperature and altitude, and what a second phase has to connect to.
TAFENG engineers work from the load list, the peak behaviour and the runtime requirement, then document which conditions each published figure applies to — including where a battery bank sits and how a second phase would parallel onto the first.
FAQ
A non-binding memorandum of understanding announced on 8 September 2026. It covers joint technical reviews of the Gunsan AI data centre infrastructure and cooperation on power and cooling efficiency. It is not a purchase contract.
A factory-assembled power block that combines a high-capacity UPS and system switchgear in a single unit, instead of delivering the two separately and integrating them on site. Gunsan would be its first deployment in South Korea.
60 MW in the first phase, with a stated path to 300 MW at full buildout, on about 9,290 m² in the Gunsan National Industrial Complex 2. Construction is targeted for the fourth quarter of 2026 and first-phase energisation for the first quarter of 2028.
They are Vertiv's own claims, published without a baseline, comparison method or capacity. Use them as a prompt to ask what the comparison was measured against, not as a design input. A factory-built block still needs the maintenance bypass, switchgear interface and access route settled before it saves anyone time.
