Does USB-PD mean USB power distribution ?
And yeah - some LEDs and a usb wire around the ceiling solves lighting a house more sensibly than a three-phase converter under the stairs and enough power going through a light switch to kill me …
It means USB Power Delivery and is a standard for negotiating custom-other-than-5V voltages from a USB Type-C power supply and communicating to the device how much current it is allowed to draw.
It's why you can charge your phone with your laptops power brick without anything exploding, and why most laptops can charge (very slowly) from pretty underpowered phone chargers now.