How do i contact hydro one brampton customer service? Call Hydro One Brampton customer service at +1 905-840-6300 for answers to your questions and concerns relating to questions about your bill, how to change electricity suppliers, ways to save money on your power bills, and/or financial assistance. For a face to face aid in creating an account, you can come to the closest store:Where is the corporate head office of hydro one? Email Corporate Head Office ExpandCollapse General Inquiries & Company Directory 416-345-5000 1-877-955-1155 (Toll-free) Mailing Address Hydro One Networks Inc. 483 Bay Street, South Tower, 8th Floor Reception Toronto, ON M5G 2P5 Regulatory Affairs EmailHow do i contact hydhydro one? Hydro One Networks P.O. Box 4102, Station "A" Toronto, ON, M5W 3L3 Large Accounts ExpandCollapse Key Account Management Email Media Requests & Inquiries ExpandCollapse Media Requests & Inquiries 416-345-6868 1-877-506-7584 (Toll-free)How do i contact hydro one about privacy issues? If you have any questions about privacy at Hydro One, please contact us using the information below: E-mail: [email protected]. Phone: 1-888-664-9376. Mail: Hydro One Networks Inc. P.O. Box 5700. Markham, Ontario. L3R 1C8. Contact Title: Director, Customer Care