KMW opens Green Rocks data center with integrated energy park

KMW opened the Green Rocks data center for a media preview ahead of the first-phase commissioning.

• Main announcement: KMW showcased the Rechenzentrum “Green Rocks” on Ingelheimer Aue as a media preview; first construction phase is scheduled to enter service end of 2026 with full completion by 2028. The facility offers up to 80 MW total electrical capacity and 54 MW IT capacity, up to 18,000 m² White Space, is reported as fully leased, and will feed waste heat via a large heat pump into Mainz’s district heating system (potentially serving up to 20,000 households). Cooling hierarchy: heat recovery -> Rheinwasser -> compression cooling; returned Rhine water will be discharged only with SGD Süd approval.
• Background and implementation details: Emergency power is provided by an existing 100 MWel BHKW (converted to supply up to 40 MW emergency) and a planned 54 MWel motor plant (also supplying 40 MW emergency) based on twelve gas engines (modular, hydrogen-ready but not yet applied for); the motor plant is expected to feed ~2,000 hours/year into the German grid (~23% of annual hours in planned use). KMW is also installing a 22 MW / 60 MWh battery. The article is a reporting/announcement of the project status and technical plans (media opening), not a speculative analysis.