The document discusses whether cloud computing is more energy efficient than traditional in-house data centers. It notes that cloud providers aim to drive efficiency through virtualization and can close down physical data centers. However, moving to the cloud may increase network traffic and energy transmission losses. The document also examines metrics like PUE that measure data center efficiency but are not the full picture. Migrating to the cloud could shift who pays rising energy costs due to green taxes as the UK faces an increasing energy gap due to nuclear plant retirements.