The Corporation is a holding company which through its wholly-owned subsidiaries:
- Toronto Hydro-Electric System Limited ("LDC") - distributes electricity and engages in Conservation and Demand Management activities; and
- Toronto Hydro Energy Services Inc. - provides street lighting and expressway lighting services, and energy efficiency products and services.
The principal business of the Corporation and its subsidiaries is the distribution of electricity by LDC. LDC owns and operates an electricity distribution system that delivers electricity to approximately 683,000 customers located in the City of Toronto.