/usr/share/applications/unity-power-panel.desktop is in unity-control-center 14.04.3+14.04.20140410-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | [Desktop Entry]
Name=Power
Comment=Power management settings
Exec=unity-control-center power
Icon=unity-power-panel
Terminal=false
Type=Application
StartupNotify=true
Categories=GNOME;GTK;Settings;DesktopSettings;X-Unity-Settings-Panel;HardwareSettings
OnlyShowIn=Unity;
X-Unity-Settings-Panel=power
# Translators: those are keywords for the power control-center panel
Keywords=Power;Sleep;Suspend;Hibernate;Battery;
X-Ubuntu-Gettext-Domain=unity-control-center
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