[castratikron]

EV charging also uses HomePlug. When Ethernet needed to be added to an existing signal line on the EV connector, HomePlug was chosen as the way to do it. Every EV consequentially will need a HomePlug modem to communicate to a charger, so, the world will have HomePlug around for quite some time.

[gwbas1c]

According to https://en.wikipedia.org/wiki/SAE_J1772, HomePlug is used in Europe. The article is otherwise rather ambiguous about how it's used in common chargers.

At least for the typical level 2 charger, the signaling is an analog square wave.

[devanl]

The typical level 2 charger doesn't have to use HomePlug, but most recent EVs will have a HomePlug modem in order to speak ISO15118 to negotiate the voltage during DC fast charging through the CCS1/2 connector.

The pilot pin that carries the square wave used for J1772 is common to both AC and DC charging, so it's possible for a level 2 charger to incorporate a modem and communicate with the EV.

In many situations it would be an unnecessary expense, but it may become more common even in level 2 chargers in the future since ISO15118 can be used to authenticate the car to the charger for plug-n-charge charging without needing a card or app to authorize the charge.