A method for determining the cause of power outages in a place equipped with a meter, said meter being associated with a sensor able to exchange information with a gateway, said gateway being electrically powered by a power pack or, in case of failure of the power pack, by a battery, said method includes: ▪ a step of observing an event waiting phase; ▪ a step of detecting by means of a microcontroller present in the gateway a power failure of the power pack; ▪ in case of detecting a power failure of the power pack, determining, by decoding by means of the microcontroller the meter signal present on the link connecting the sensor to the meter, if an energy consumption of the meter is null or not, said meter signal is of the Client Teleinformation TIC type; - if the decoded meter signal reveals a null energy consumption, interpreting the meter signal as revealing a failure of an electrical power supplier for the place equipped with the meter or as revealing the presence of a circuit breaker for the place considered in a blocked position; - if the decoded meter signal reveals a non null energy consumption, interpreting the meter signal as revealing a failure of the power pack, ▪ a step of detecting, by means of a microcontroller, an absence of the TIC type signal present on the link connecting the sensor to the meter; ▪ in case of an absence of the TIC type signal present on the link connecting the sensor to the meter and if the absence of the TIC type signal is detected before the power failure of the power pack, determining whether the gateway is powered by the battery; - if the gateway is powered by the battery, interpreting the absence of TIC type signal as revealing a failure of the electrical power supplier; - if the gateway is not powered by the battery, interpreting the absence of TIC type signal as revealing a failure of the meter and/or the sensor. ▪ a step of observing an event waiting phase; ▪ a step of detecting by means of a microcontroller present in the gateway a power failure of the power pack; ▪ in case of detecting a power failure of the power pack, determining, by decoding by means of the microcontroller the meter signal present on the link connecting the sensor to the meter, if an energy consumption of the meter is null or not, said meter signal is of the Client Teleinformation TIC type; - if the decoded meter signal reveals a null energy consumption, interpreting the meter signal as revealing a failure of an electrical power supplier for the place equipped with the meter or as revealing the presence of a circuit breaker for the place considered in a blocked position; - if the decoded meter signal reveals a non null energy consumption, interpreting the meter signal as revealing a failure of the power pack, - if the decoded meter signal reveals a null energy consumption, interpreting the meter signal as revealing a failure of an electrical power supplier for the place equipped with the meter or as revealing the presence of a circuit breaker for the place considered in a blocked position; - if the decoded meter signal reveals a non null energy consumption, interpreting the meter signal as revealing a failure of the power pack, ▪ a step of detecting, by means of a microcontroller, an absence of the TIC type signal present on the link connecting the sensor to the meter; ▪ in case of an absence of the TIC type signal present on the link connecting the sensor to the meter and if the absence of the TIC type signal is detected before the power failure of the power pack, determining whether the gateway is powered by the battery; - if the gateway is powered by the battery, interpreting the absence of TIC type signal as revealing a failure of the electrical power supplier; - if the gateway is not powered by the battery, interpreting the absence of TIC type signal as revealing a failure of the meter and/or the sensor. - if the gateway is powered by the battery, interpreting the absence of TIC type signal as revealing a failure of the electrical power supplier; - if the gateway is not powered by the battery, interpreting the absence of TIC type signal as revealing a failure of the meter and/or the sensor.