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Uninterruptible power supplies can be viewed as both power quality and backup power solutions. Within the rapidly growing data centre market there is a growing awareness of the potential to run on-line UPS in a less resilient power mode known as ECO-mode to reduce running costs (electricity usage and to a degree environmental cooling) and improve power usage effectiveness (PUE). UPS are also now being classed as High Efficiency thanks to advances in both electronics and transformer design. This document discusses the advantages and disadvantages of such an approach, and the longer-term implications for UPS systems within an IT environment.