It depends. Look up PUE for data centers. Because I work for Google, I recall, for example, that we build very efficient data centers: https://www.google.com/

It depends. Look up PUE for data centers. Because I work for Google, I recall, for example, that we build very efficient data centers: https://www.google.com/about/datacenters/efficiency/ https://www.google.com/about/datacenters/efficiency/ Ie. just 10% overhead.