Where am I ?

Contact Us


Contact us, Hydro One call agents are here to assist you
We're here to assist you.

Call us at 1-888-664-9376​.

Our call centre is open Monday to Friday between 7:30 a.m. and 8:00 p.m. and on Saturdays between 9:00 a.m. and 3:00 p.m. 

There may be a range of reasons you wish to speak to Hydro One. Check the table below for the topic you are inquiring about.

Customer Communications Centre
Email​ Address CustomerCommunications@hydroone.com
Billing and Service Inquiries (7:30 am - 8:00 pm EST, Monday to Friday; Saturday 9:00 am - 3:00 pm EST)​ 1-888-664-9376
Report a Power Outage, Fallen Tree Hazard or Emergency (24 Hours) 1 (800) 434-1235
Fax​ (905) 944-3251
1-888-625-4401 (Toll-Free)
Mailing Address​

Hydro One Networks Inc.
P.O. Box 5700, Markham, Ontario  L3R 1C8

Complaints Process Complaints Process


Corporate Head Office
Main Switchboard Toll-Free​ 1-877-955-1155
Main Switchboard Toronto​ 416-345-5000
Mailing Address​ Hydro One Networks Inc.
483 Bay Street
South Tower, 8th Floor Reception
Toronto, Ontario   M5G 2P5​


Environment, Health & Safety
Toll-Free Electric and Magnetic Fields (EMF) Inquiries 1-800-728-9533


Local Distribution Companies (LDCs), Industrial/Large Customers and Generators
General Inquiries​ LargeAccounts@hydroone.com
See also Customer Business Relations
Application/Document Submissions​ DxGenerationConnections@hydroone.com
Mailing Address​ Hydro One Networks Inc.
Attn: Dx Generation Connections Group
185 Clegg Road, Markham, ON   L6G 1B7​


Regulatory Affairs
General inquiries on applications filed with the Ontario Energy Board Regulatory@hydroone.com
Fax 416-345-5866


Right-of-Way and Property Maintenance
​Hydro One does not own and is not responsible for maintaining all of the property on transmission corridors. Before calling us, please contact your local municipality to confirm ownership. For the transmission corridors we maintain, Hydro One has a policy of cutting grass six times a year. ​
General inquiries about conditions on Hydro One's transmission
corridors and properties, such as high grass or dumping ​
Corridor maintenance requests​ CustomerCommunications@hydroone.com​​
Hydro One Real Estate Services​ 1-888-231-6657


Security Operations ​
If you have any information regarding suspected theft of electricity, please call our toll-free number. The Hydro One Theft of Power Tips Line is NOT traceable back to the person who calls. Please email us if you see any suspicious activity on
Hydro One property.​ ​​ ​
Email​ Address Security.Operations@hydroone.com
General Inquiries/Theft of Power Tips Line​ 1-866-550-6477


Sponsorships and Donations
General Inquiries​ See Sponsorships and Donations


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

Email:  service@computershare.com 


Analysts & Institutional Investor Inquiries
Hydro One Investor Relations
483 Bay Street, FL7
Toronto, ON   M5G 2P5

Email: investor.relations@HydroOne.com

Skip navigation links