A data center is a facility used to house telecommunications storage systems stems and associated components. It generally includes: redundant or backup power supplies, redundant data communications connections, environmental controls (e.g. air conditioning, fire suppression), and security devices. Large data centers are industrial scale operations using as much electricity as a small town. Equipment, space, and bandwidth are available to retail customers. Customers generally cross connect their equipment to a variety of telecommunications carriers and network service providers inside the center.