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Transmission-connected Generators

Transmission-connected generators connect to Hydro One's high-voltage system at more than 50,000 volts and are registered with the Independent Electricity System Operator.

Transmission facilities operate at voltages above 50 kilovolts (kV). Transmission lines are not as plentiful as the distribution lines. See map of Ontario's transmission lines. For a transmission-connected facility, generators must have Hydro One conduct a Transmission Customer Impact Assessment (CIA) as well as a System Impact Assessment (same form as CIA) conducted by the Independent Electricity System Operator (IESO).