# ENGIE Deutschland wins HVAC contract for Mainz data center expansion

Mainzer Stadtwerke AG awarded ENGIE Deutschland GmbH a contract for heating, ventilation and air-conditioning installation work for the expansion of the ARZ Mainz data center in Mainz, Germany. The contract award was published on 16 October 2026.

- Type: Contract
- Announced: 2026-10-16
- Where: Mainz, Germany
- Status: completed
- Products: Heating, ventilation and air-conditioning installation work
- Sectors: [HVAC and Industrial Refrigeration](https://endata.com/sectors/hvac-refrigeration.md)

## Companies

- [ENGIE Deutschland GmbH](https://endata.com/companies/36275.md) (supplier)
- [Mainzer Stadtwerke AG](https://endata.com/companies/94628.md) (customer)

## Sources

- [eutenders.initask.com](https://eutenders.initask.com/notice/716566-2026), 2026-10-16: "Leistungserweiterung des Rechenzentrums ARZ Mainz, Walter-Hallstein-Straße 20, Mainz für die Mainzer Stadtwerke AG, Los 2: Kältetechnische Anlagen"

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Data from Endata (https://endata.com/). Announcements are summarized from public sources and may be incomplete; check the linked originals.