New generator connections

Capacity on the System

Our electricity distribution system has technical limits to the amount of generation that can be connected at any point on the network. When the technical limits are reached, the system is considered to have reached its capacity. The capacity for various sections of the distribution system varies as it is dependent upon the equipment installed along the path from the generator to the user.

In order to accept electricity generated by a generation project, Hydro One must ensure there is sufficient capacity available to deliver the electricity to those who need it. This can only be accurately determined by performing a Connection Impact Assessment (CIA), which is done when the generator submits a Form B to Hydro One.

Photo of Hydro One workers in a transmission station with a large windmill in the background

The List of Station Capacity and List of Applications will no longer be published on this web page, as Hydro One's Generation Capacity Map and Station Capacity Calculator are the primary tools available for customers interested in DER capacity on our distribution system.

After consulting the map

Next steps

Verify station capacity using our calculator

Please use our Station Capacity Calculator to confirm there is capacity on our system for your proposed generator.

For proposed DER facilities more than 10 kW

Please visit our connection process and DER web pages for details on submitting your connection application and to learn more about the process.

For proposed Micro DER facilities 10 kW or less

Please visit our Micro DER web page for connection and application information.

For more information on DER hosting capacity

Please email our Distributed Generation Connections Group or call 1-877-447-4412.