A power adapter with a cord-fastening, and one or more fastening tabs for semi-permanently securing the power adapter to a wall socket. Female receptacles within the device can be designed to accept standard corded connections widely accepted in use with electronic devices (e.g. mobile phones, tablets, and other personal electronic devices) such as male ends of various USB (Universal Serial Bus) standards or other well-known connector types. Male prongs can be designed to fit into a standard wall outlet, and optionally can be designed to fold into the adapter body when not in use.