Transmission-connected generators connect to our high-voltage system at more than 50 kV (50,000 volts) and are registered with the Independent Electricity System Operator (IESO).
Please refer to our Hydro One Transmission Generation Interconnection Requirements and the Protection Planning Standard at the
bottom of this page for generation connection requirements for the Hydro One transmission system.
Transmission Generation Connection Process
There are six phases in the transmission generation connection process that include multiple steps and procedures within each phase that may overlap to facilitate critical in-service dates.
We recommend you first complete a pre-consultation and read these important considerations before you begin the transmission connection process for Generators.
The phases of the transmission connection process are identified below:
System and Customer Impact Assessments
Approximate Timeline: An average connection can take anywhere from 18 months to over three years to complete. Certain land issues and approval processes can extend project timelines.
IESO CONNECTION ASSESSMENT AND APPROVAL (CAA)
Customers requesting a new or modified connection to our transmission system must apply and register with us and The Independent Electricity System Operator (IESO). The IESO Connection Assessment and Approval (CAA) is a separate process that runs parallel with our Customer Connection Process. The CAA process includes a System Impact Assessment (SIA) which is conducted to assess the impact of the connection proposal on the reliability of Ontario’s transmission system.
The pre-consultation provides an opportunity for the proponent to discuss their transmission generation connection project with our planning staff. The proponent will receive more information on the transmission connection process and our staff will gain a better understanding of the project. This will help make the project successful.
The proponent should bring all relevant project information and documentation to allow for effective discussion, such as:
Contact our representative to request a pre-consultation meeting. It can normally be arranged within one to two weeks.