June 18, 2022

Prior To Major Event

1. Did the distributor have any prior warning that the Major Event would occur?

No, Hydro Ottawa had no prior warning that the Major Event would occur as it occurred due to a loss of supply event.

2. If the distributor did have prior warning, did the distributor arrange to have extra employees on duty or on standby prior to the Major Event beginning? Brief description of arrangements, or explain why extra employees were not arranged.

Hydro Ottawa had a full complement of on-shift personnel, and a full on-call roster of field technicians and management personnel available.

3. If the distributor did have prior warning, did the distributor issue any media announcements to the public warning of possible outages resulting from the pending Major event?

Hydro Ottawa had no prior warnings that the Major Event would happen as it occurred due to a loss of supply event, no advance notification was issued to the public.

4. Did the distributor train its staff on the response plans for a Major Event? 

Yes. Hydro Ottawa has an established Electrical Emergency Response Plan and Organization, which includes processes and procedures for which staff are trained on.  Formal training is completed annually according to Market Rules.  In addition weekly preparation meetings are held to refresh on-call management personnel.

During the Major Event

1. Please identify the main contributing Cause of the Major Event as per the table in section of the Electricity Reporting and Record Keeping Requirements.

  • Loss of Supply
  • Lightning
  • Adverse Weather - Wind
  • Adverse Weather - Snow
  • Adverse Weather - Freezing Rain/Ice Storm
  • Adverse Environment - Fire
  • Adverse Environment - Flooding
  • Others

1.1. Please provide a brief description of the event (i.e. what happened?). 

On June 18th at 12:13pm a cable fault occurred on the Hydro One C7BM 115kV transmission supply resulting in a loss of supply to six Hydro Ottawa substations which led to 27000 Hydro Ottawa customer outages.

2. Was the IEEE Standard 1366 used to identify the scope of the Major Event? If not, why not?

Yes. Hydro Ottawa used the IEEE Standard 1366.

3. When did the Major Event begin (date and time)?

June 18, 2022 @ 12:13pm

4. Did the distributor issue any information about this Major Event, such as estimated times of restoration, to the public during the Major Event? If yes, please provide a brief description of the information. If no, please explain.

Yes, estimated times of restorations for the major outage were issued by Hydro Ottawa’s Outage Management System, Power Outage Line and email Outage Alerts beginning at 12:47 pm June 18th. The first social media post was published on Twitter at 12:39 pm. Regular updates were provided.

5. How many customers were interrupted during the Major Event? What percentage of the distributor’s total customer base did the interrupted customers represent?

27,405 customers were interrupted during the Major Event, representing 8% of Hydro Ottawa’s total customer base.

6. How many hours did it take to restore 90% of the customers who were interrupted?

It took 2 hours and 40 minutes to restore 90% of the customers related to the major outage. The major outage started at 12:13 pm on June 18th, 2022 and 90% were restored at 2:53 pm of the same day.

7. Were there any outages associated with Loss of Supply during the Major Event? If so, please report on the duration and frequency of Loss of Supply outages.

Yes, there was one Loss of Supply during the Major Event resulting from a cable fault on the transmission supply. The outage affected 27,000 customers for a total of 51,196 customer hours. The outage contributed 0.078 to SAIFI and 0.147 to SAIDI.

8. In responding to the Major Event, did the distributor utilize assistance through a third party mutual assistance agreement with other utilities? If yes, please provide the name of the utilities who provided the assistance?


9. Did the distributor run out of any needed equipment or materials during the Major Event? If so, please describe the shortages.


After the Major Event

1. What steps, if any, are being taken to be prepared for or mitigate such Major Events in the future (i.e., staff training, process improvements, system upgrades)?

  • No further action is required at this time.
  • Additional staff training
  • Process improvements
  • System upgrades
  • Others

Additional comments:

There is an ongoing focus on on-call and emergency response preparations with the goal of continuous improvement.

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