The noise you hear comes from one of our installations: the Lévis substation.
The noise is made by the air-blast circuit breakers, which are protective equipment and function much like the fuses or breakers in your home’s distribution panel. The bang occurs when we balance the supply and demand of electricity on our network in real time to meet the electricity needs of our customers. These needs change, especially in peak periods: early in the morning and in the evening.
In the next three to five years, the noise should stop. The air-blast circuit breakers at the Lévis substation are coming to the end of their service life and will be progressively replaced with new gas circuit breakers that are totally silent.
For more information on our substations, visit the Understanding Electricity section of our Web site.