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A System Impact Assessment (SIA) is a mandatory assessment conducted by the IESO to assess the impact of the connection proposal on the reliability of the integrated power system for projects greater than 10MW.


SIAs are conducted with input from the affected transmitter(s) and in consultation with the connection applicant. This process may take up to 150 days from the time the IESO receives the SIA application, associated documents, and deposit. SIA applications sent to the IESO without the accompanying distributor’s
Connection Impact Assessment (CIA) are considered incomplete. 

Click here
for to learn more about the IESO’s SIA process.