On 10. February 2014, US Department of Energy (DOE) published a final rule prescribing new energy conservation standards for external power supplies. This new regulation applies to all direct operation External Power Supplies and includes, in addition to Class A power supplies previously covered by 2007 standards, power supplies that have not previously been subject to DOE regulations, such as:

• multiple-voltage EPSs,
• EPSs with nameplate output power greater than 250 watts, and some
• EPSs that charge the battery of a product that is fully or primarily motor operated.