A data centre, similar to a Network Operations centre, contains automated systems with the help of some central computers and associated components that contribute to the successful handling of core business & operational data. A data centre may be a physical one or a virtual one with redundant power supply, network connections and security devices. Mainly used for storage, a data centre also runs CRM & ERP like applications for the overall monitoring of the entire system. When talking about energy efficient data centres, then Google comes out on top with an energy saving of nearly 50% and data secured in critical encrypted formats across several servers across the world.
The data centres and google:
A data centre commonly known as server farm, is a facility housing computer systems (telecommunications and storage systems). It generally provides backup and security features, redundant data communications connections...etc.
Here is the list of datas centres directly attached to Google.