The amount of energy required to operate data centers is constantly growing. In German financial center Frankfurt, data centers are today responsible for 20 percent of all electricity consumption, and the trend is growing. Certifications can be helpful in terms of finding more sustainable alternatives when selecting data centers and hardware. The certificates are awarded for individual hardware components (for example, the Blue Angel or Energy Star labels for servers and data storage products), but also for entire data centers and colocation data centers, where companies rent space to operate their own IT hardware. In addition to the Blue Angel, there is also, for example, the CEEDA certificate for data centers. The Blue Angel label certifies efficient power supply and air conditioning as well as the use of energy-efficient, durable and environmentally friendly hardware components. Consistent monitoring of data center operations and an annual report ensure ongoing compliance.