The ENERGY STAR program no longer has a separate specification or designation for external power supplies. This is explained and clarified at the ENERGY STAR program website, see:

The ENERGY STAR PC standard, v6.1, does, however, require that the external power supplies meet the international level V requirements, in order for the notebook to be qualified to ENERGY STAR and all adapters used on our ENERGY STAR products meet this requirement.

This extract from the ENERGY STAR PC Standard, v6.1, provides the specification, see page 8 at the following link: