Sign In

We want you to be able to access myAccount. However, the new, easy-to-use features in myAccount require you to enable cookies. Here are some shortcuts to help you with this:

Help for Chrome users. Help for Firefox users. For Internet Explorer users. For Safari users.

Once you have enabled cookies for this website, please refresh by clicking here.


​​​​​​​​​​​​​​​​A Connection Impact Assessment (CIA) is a more detailed assessment of a project’s impact to the grid. The results include a technical report outlining project feasibility, technical specifications needed for the project, and the impacts the project would have on the distribution grid.


​​​​​​​​​​​​​​​​The Generator is required to submit a completed CIA (form found here) along with a Distribution Operating Map (DOM), payment for the Connection Impact Assessment and a signed Study Agreement. 

​​​​​​​​​​​​​​​​Please email ​​​​​​​​​​​​​ or call 1-877-447-4412 (choose option #2) for a Study Agreement suited to your project size.

​​​​​​​​​​​​​​​​A complete CIA application consists of:
  • Completed and signed CIA Form

  • Payment in full by cheque payable to “Hydro One Networks Inc." (see Connection Impact Assessment Fee Schedule below)

  • Signed Study Agreement

  • Single Line Diagram (SLD)

  • Distribution Operating Map (DOM)

  • All technical submissions (Form B, single line diagrams, etc.) for projects greater than 10 kW must be signed and sealed by a licensed Ontario Professional Engineer (P.ENG).​​​​​​​​​​​​​​​​

Notice: New CIA fee effective January 1, 2017

Category (As of January 1, 2016) Previous Category Project Sizes Cost CIA Type
*Threshold Allocations For LDCs only (Same) Various $500.00 Regular
CAE Small DG & Net Metering Small Capacity Allocation Exempt (CAE), Net Metering Must be 3-phase generation facility and either:
*a) >10 kW and ≤30 kW and connecting to less than 15 kV OR *b) >10 kW and ≤100 kW and connecting to ≥15 kV
Effective January 1, 2016
Effective January 1, 2016

Must not be a microFIT facility or​​ option a) or b) above, and:
c) >10 kW and ≤500 kW
d) ≤250kW connected on distribution system voltage <15 kV
e) ≤500 kW connected on distribution system voltage ≥15 kV
Effective January 1, 2017
​Greater than CAE Small DG & Net Metering Small (non-CAE), Mid-  sized, Large​
 f) ≤10 MW but >25 0 kW connected on distribution system voltage <15 kV
 g) >500 kW but ≤10 MW connected on distribution system voltage ≥15 kV​
 Effective  January 1,  2017

Important Notes:
  • *The “Threshold Allocation Assessment (TAA)" process has been changed to the “Threshold Allocation (TA)" process. TA applicants now receive an Agreement Letter from us acknowledging capacity based on Bus Type as opposed to previous classifications based on “Inverter Based" and “Load Displacement". The fee for a Threshold Allocation (TA) is $500, and does not vary according to    

  • project size

  • **Criteria a) and b) in the CIA Fees Table above, including cost, became effective January 1, 2016 for qualifying CAE Small DG and Net Metering CIA applications. ​

  • ***New CIA fee effective January 1, 2017​.

  • The Ontario Energy Board approved an increase in Delivery rates effective May 1, 2015. Revised CIA fees were included in the approval. The new rates are reflected in the CIA Fees Table above.

  • Refund policy: Cost not spent will be refunded if the CIA is withdrawn before completion.

  • CIA revisions will be charged 50% of the CIA costs listed in the table above.

  • An additional $10,000 will be required for projects that involve another LDC (does not apply to Net Metering projects).

  • Please note that all costs listed on this page do not include applicable taxes (HST).

  • Please also note the costs are only for the CIA application. We will perform the CIA study and send a completed CIA report to the customer outlining any additional costs to connect their facility to our Distribution System.