Quarterly Investment Community Teleconference The Company's first quarter 2022 results teleconference with the investment community will be held on May 5, 2022 at 8 a.m. ET, a webcast of which will be available at www.HydroOne.com/Investors. Members of the financial community wishing to ask questions during the call should dial 1-866-221-1674 prior to the scheduled start time and request access to Hydro One's first quarter 2022 results call, conference ID 6793175 (international callers may dial 1-270-215-9604). Media and other interested parties are welcome to participate on a listen-only basis. A webcast of the teleconference will be available at the same link following the call. Additionally, investors should note that from time to time Hydro One management presents at brokerage sponsored investor conferences. Most often, but not always, these conferences are webcast by the hosting brokerage firm, and when they are webcast, links are made available on Hydro One's website at www.HydroOne.com/Investors and are posted generally at least two days before the conference.