Uninterruptible power supplies (UPS) provide backup power and typically are used to ensure the continued operation of computers, data center equipment, telecommunications equipment, and other devices in the event of a power failure.
There are no national standards for UPS. In December 2016 DOE issued a final rule for UPS, which should have established the first national efficiency standards for these products. However, DOE has yet to publish the UPS final rule in the Federal Register. California’s battery charger standards covered UPS starting in 2014, and in May 2018 Vermont adopted state standards for UPS equivalent to the standards in the DOE final rule. The Vermont standards will reduce energy consumption for the most common types of UPS by 40–50%.
DOE estimates that 51% of shipments of uninterruptible power supplies meet the standards in the DOE final rule.