Turning Power Chime Off On new Macbook Pro, Power Chime runs. Whenever I delete from core services it comes right back. It makes a sound when plugging in your power cord even when the volume is at 0%.

The solution I have now to disable this annoying sound is an AppleScript application that runs on login to kill the process via terminal. Is there a better way?
The solution is to set ChimeOnNoHardware to true instead of setting ChimeOnAllHardware to false (note, No instead of All):

defaults write com.apple.PowerChime ChimeOnNoHardware -bool true
killall PowerChime