A 2009 dated EU Directive 2009/125/EC establishes a framework for the setting of ecodesign requirements for energy-related products. Separate EU Regulations set ecodesign specifies for individual product groups within this framework.
A 2009 dated EU Regulation (EC) No 278/2009 set the ecodesign requirements for external power supplies, and this is now reviewed and updated.
EU Regulation (EU) 2019/1782 now sets the new ecodesign requirements for external power supplies from 1st April 2020 (and Regulation (EC) No 278/2009 is repealed from that date). The new EU Regulation is here. It specifies energy efficiency requirements.
EU Regulation (EU) 2019/1782 applies to all external supplies as defined in Article 2, except a short list set out in Article 1.
The updated European Regulation applies to the EU member states, including the UK (where it will be regarded as Retained EU Law).
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