It is possible that your devices will remain in DR (Éco-Sinopé) mode for a short time after the end of the peak event since the return to « normal » mode is done gradually and randomly among all the devices registered to the functionality in order to protect the installations from the electrical grid. 

Moreover, by reactivating all the participating devices at the same time, it could generate an energy peak at Hydro-Quebec at the end of an event, which we are asked to avoid.