ETOR probably stands for Estimated Time of Restoration, i.e. the time at which the power will probably go back on again. A quick search of ETOR led me to https:

ETOR probably stands for Estimated Time of Restoration, i.e. the time at which the power will probably go back on again. A quick search of ETOR led me to https://www.torontohydro.com/how-we-restore-power https://www.torontohydro.com/how-we-restore-power, which explains how ETORs are calculated and even has a nice video on it.