Abstract: A generator adaptor has a body portion with one or more sets of stab terminals for insertion in the socket terminals of a standard electric meter receptacle to connect the adaptor in place of a regular meter unit during a power failure in a primary electric supply line. The adaptor has one set of such stab terminals positioned for insertion in a corresponding set of socket terminals in the meter receptacle which are connected to the normal outgoing load lines from the meter receptacle. The adaptor has an auxiliary electric supply line with wires which are connected at one end to this one set of stab terminals and which have connecting terminal portions at their other ends for connection to an auxiliary power source such as a stand-by generator. The adaptor construction prevents any current-transmitting connection from the incoming primary supply lines to the socket terminals connected to the outgoing load lines.