Please see notice below from Ontario Power Generation (OPG) in regards to Sunday, January 12, 2020 alert from the Pickering station.
“The alert occurred due to an error while the Province’s Emergency Operations Centre conducted a training exercise. The office of the Solicitor General is investigating in order to understand how this happened. Both Pickering and Darlington stations are operating as designed.”
Please see information on this matter at the link below on OPG’s website.
Also, here is a link to the Solicitor General’s statement.