This document discusses the concept of "negawatts", which refers to the amount of energy saved through increased efficiency or reduced consumption. A negawatt is a theoretical unit of power representing the amount of energy saved. The document provides some key facts about information and communication technology (ICT) energy consumption, including that ICT accounts for 5-10% of total electricity use globally and data centers are growing fast in energy demand. It also discusses opportunities to reduce infrastructure costs through server consolidation, virtualization, and improved efficiency.