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Submer Group launches Corenix with 500MW liquid-cooling track record behind modular AI data centre push

28 September 2026
3 minutes
Submer Group has launched Corenix, a modular data centre infrastructure company serving neoclouds, hyperscalers and AI operators, and appointed former Johnson Controls executive Martin Renkis as CEO.
Headshot – Corenix’s CEO Martin Renkis
Headshot – Corenix’s CEO Martin Renkis

Headquartered in Houston, Corenix designs, integrates and factory tests complete data centre modules, covering IT, power, cooling and networking, at its production facilities before delivering them to customer sites. It then manages installation, connection to site infrastructure, acceptance testing, commissioning and operational readiness. Each platform is based on an Nvidia reference design and engineered to the client’s requirements.

Submer Group said traditional builds cannot keep pace with the power, cooling, networking and serviceability demands of accelerated computing, or with the need to support successive generations of high-density hardware. The modular model is designed to let customers start with the capacity they need and expand as demand, power availability and site infrastructure allow.

The launch is the latest step in Submer’s move beyond its immersion cooling roots, after it expanded into data centre design and construction. The group has deployed more than 500MW of liquid-cooled infrastructure and holds over 8GW of powered land across the Americas, EMEA and APAC. It pointed to a campus with hundreds of megawatts of capacity delivered as a fully modular buildout in nine months from order to delivery.

Patrick Smets, CEO of Submer Group, said AI factories were driving unprecedented demand for new capacity and that the market needs “a faster, more predictable way to build it”.

Renkis said customers want clarity on scope, testing and accountability before committing, and that Corenix will put “a go-live date on the table before a contract exists”, with a single team responsible from factory integration through to on-site commissioning.

At Johnson Controls, Renkis was executive director of data centre infrastructure services, developing AI infrastructure offerings spanning power, cooling, heat recovery, operations and financing. He previously founded Smartvue, an IoT platform acquired by Johnson Controls, and Trainersoft, an e-learning company acquired by OutStart, now part of IBM.

Corenix sits alongside two other Submer Group companies: Rubix Data Centers, which develops and operates AI data centre campuses, and Radian Arc, which provides GPU-as-a-Service and AI-as-a-Service. Founded in Barcelona in 2015, the group has hubs in Houston and Taipei.

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