Notice of 2021 Annual Meeting of Shareholders To be held on May 26, 2021 and Management Information Circular Your vote matters Please take a moment to vote. Your participation as a shareholder is important to us. Notice of 2021 Annual Meeting of Shareholders and Availability of Proxy Materials Hydro One Limited (Hydro One or the company) is providing you Notice is hereby given that an with electronic notice and access to its management information annual meeting of shareholders circular (the circular) for the company’s 2021 annual meeting of of Hydro One will be held: shareholders (the meeting) instead of mailing out paper copies, as permitted by applicable Canadian securities laws. Electronic delivery When: is environmentally friendly and saves money. All shareholders are Wednesday, May 26, 2021 reminded to review the circular before voting. If you have questions 9:30 a.m. – 11:00 a.m. about the notice and access, please call 1-877-907-7643 toll-free (Eastern Time) within North America, for service in English or French or by email at
[email protected]. This notice provides details Where: of the date, time and means of accessing the meeting, including Virtual shareholders meeting matters to be voted on at the meeting. Accompanying this notice is a via live audio webcast online at form of proxy or voting instruction form that you will need to vote by www.virtualshareholder proxy and/or to access the virtual shareholders meeting using your meeting.com/Hydro12021 unique 16-digit control number. The purpose of the meeting is to: