It is widely known that most AC-DC converters (aka "wall warts") continually use electricity, even when no devices are plugged in to them. That wasted energy is often called "phantom electricity" or "phantom use".

[![wall wart](https://i.stack.imgur.com/nT6OC.png)](https://i.stack.imgur.com/nT6OC.png)

A new trend is USB (DC) outlets, whether integrated into the wall plate:

[![wall plate USB](https://i.stack.imgur.com/teFpb.jpg)](https://i.stack.imgur.com/teFpb.jpg)

or attached to an existing AC receptacle:

[![add-on USB](https://i.stack.imgur.com/8yTI9.jpg)](https://i.stack.imgur.com/8yTI9.jpg)

Do both of these two new types of AC-DC converters waste energy just like the old wall warts?

If so, what is a reasonable solution?