General Shareholder Inquiries
​Computershare Trust Company of Canada
100 University Avenue
Toronto, ON M5J 2Y1
​Tel: 1-800-564-6253 or 514-982-7555
Fax: 1-888-453-0330 or 416-263-9394

Customer Inquiries
​Hydro One Networks Inc.
P.O. Box 5700,
Markham, ON L3R 1C8
Billing and Service Inquiries: Tel: 1-888-664-9376

Report an Emergency (24 hours): Tel: 1-800-434-1235
Analysts & Institutional Investor Inquiries
​Hydro One Investor Relations
483 Bay Street, 7th Floor
Toronto, ON M5G 2P5