Ward 21 Reliability Cedarvale and Surrounding Area Prepared for Councillor Mihevc Toronto Hydro System Planning March 25, 2015

Toronto Hydro Overview of Toronto Hydro Assets in Ward 21 2 | 47,000 Residents 12,500 Customers Two Stations 34 Feeders One third of the infrastructure is overhead 124 Circuit km of overhead conductors Two thirds of the infrastructure is underground 256 Circuit km of underground cables 985 Transformers 3002 Poles

Toronto Hydro System-Wide Reliability 3 | Reliability has been improving over the past five years Toronto Hydro uses three metrics to measure reliability of the system Number of Customers Interrupted (CI) - SAIFI Duration of Customer Interruptions (CHI) - SAIDI Total number of Interruptions on a feeder (Worst Performing Feeder Program)

Toronto Hydro Worst Performing Feeders | 7 Interruptions 8-11 Interruptions 12+ Interruptions *Worst Performing Feeders looks at the number of interruptions at the feeder level *Excludes outages due to loss of supply (Hydro One)

Toronto Hydro Reliability in Cedarvale and Surrounding Area 5 | 35M6 35M4 35M9 35M10 Number of Events Per Feeder Total outages on 35M6 Feeder 2 (+1)2 (+2)4 (+1) Total outages on 35M4 Feeder 48 (+1)6 Total outages on 35M9 Feeder 243 (+1) Total outages on 35M10 Feeder 1116 (+2)7 Note that localized outages are included and that not every customer is affected by each outage. Outages considered to be “Major Events” are added in brackets.

Toronto Hydro Feeder Ties 6 | Feeder ties help to build redundancy by creating a highly interconnected system When there is an outage, feeder ties allow the problem to be isolated so that switching can occur to reroute power to as many customers as possible We are working to automate this process where possible Automated Switches help to restore power quickly Feeder Automation provides the grid with the intelligence to restore power to most of the feeder within one minute 35M6 35M4 35M9 35M10

Toronto Hydro Capital Investments 7 | Submitted a five-year ( ) rate application to the OEB in July 2014 which includes plans to significantly invest in Toronto’s aging electricity grid Expect a decision in Q $5M of proposed capital investment in Ward 21 to help improve reliability and decrease the duration of outages 1.Dewbourne Avenue Overhead rebuild (Scheduled for 2017) Rebuilding the overhead infrastructure by replacing poles and transformers. 2. Short term mitigation work (Completed 2014) Replacing overhead defective assets within the overhead infrastructure. 3. Bathurst Street Rehabilitation (Scheduled for 2017) Rehabilitate a section of Bathurst Street to remove obsolete assets and rebuild portions of the secondary laterals supplying customers. 4. Vaughan Road Overhead Rebuild (Scheduled for ) Rebuilding the overhead infrastructure by replacing poles and transformers. 5. Shalmar and Vesta Rear Lot Conversion (Scheduled for ) Conversion from of the distribution infrastructure from rear lot supply to front lot underground. Note: Projects are subject to regulatory approval and timing is subject to change based on project prioritization

Toronto Hydro Maintenance Program 8 |