China Southern Power Grid Puts 80 kW of Immersion Cooling Inside a 40-Foot Container

China Southern Power Grid unveiled a factory-prefabricated computing module that packs four immersion liquid-cooling cabinets and 80 kW of IT load into a 40-foot standard shipping container, cutting the build cycle to three months and upfront investment by 40% to 50%.

The unit, branded a liquid-cooled computing cabin, appeared at the utility's booth at the 2026 China International Big Data Industry Expo, which opened in Guiyang on August 28 under the theme of tokens as a new route to releasing the value of data elements.

It was developed by the digital and intelligent centre of Guizhou Power Grid, a subsidiary of China Southern Power Grid, and was formally completed and brought into service this month at the Southern Energy big data centre in the Gui'an New Area.

The design target is a power usage effectiveness ratio at or below 1.15. Heat rejection runs on a hybrid of liquid cooling and free cooling: the coolant circulates through a plate heat exchanger and a closed cooling tower in a full closed loop, drawing on Guizhou's cool climate to hold down auxiliary energy consumption.

Staff at the booth framed the engineering choice in load terms. Per-rack power density has climbed from 5 kW to more than 20 kW, pushing total infrastructure consumption up exponentially and forcing the shift from air cooling to liquid cooling.

For a wire-scale audience tracking capital cost per megawatt of AI-ready capacity, the claimed 40% to 50% saving on initial investment and a three-month construction window are the two numbers that matter. Both are asserted for a container-scale block rather than a hall-scale build, which is what makes the comparison awkward against conventional greenfield data centre timelines.

The same 1.15 PUE ceiling is claimed for a separate line of deployments in substations and building switchrooms, where Guizhou Power Grid is building urban computing-network nodes using a super-chassis design. Those nodes are tied into the computing cabin through a closed-loop network linking three nodes, with the operator offering rental of the computing base environment, computing hardware, and computing applications.

The institutional backdrop is a policy line rather than a market one. Computing-power and electricity coordination entered the government work report for the first time in 2026. That places a grid operator, not a hyperscaler or a colocation developer, in the position of packaging and leasing compute capacity.

The expo agenda also carried a data-governance component. The National Data Administration was set to release results in the fields of tokens, data annotation, data infrastructure, and digital talent training.

What the product does not resolve is scale. A single 40-foot unit at 80 kW of IT load is roughly two racks' worth of the density the booth staff described, and the utility has disclosed three interconnected nodes rather than a fleet. The interest for operators outside China is the ownership model: the entity that sells the electricity is also selling the cooling, the enclosure, and the hardware lease, compressing what is usually a three-party negotiation into one counterparty.

A separate C114 report published on August 28, 2026 described the launch of a single-cabinet immersion liquid-cooling solution at the Guiyang data industry conference, with the same 1.15 PUE figure and the same 40% to 50% initial-investment reduction.