Ward 21 Reliability

Cedarvale and Surrounding Area

Prepared for Councillor Mihevc

Toronto Hydro System PlanningMarch 25, 2015

Toronto Hydro

Overview of Toronto Hydro Assets in Ward 21

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• 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

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• 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)

2010 2011 2012 2013 20140.000.200.400.600.801.001.201.401.601.802.00

2010-2014 Reliability

SAIFI SAIDI

YEAR

Toronto Hydro

Worst Performing Feeders 2014

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7 Interruptions 8-11 Interruptions12+ 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

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35M6

35M4

35M9

35M10

Number of Events Per Feeder

2012 2013 2014

Total outages on 35M6 Feeder

2 (+1) 2 (+2) 4 (+1)

Total outages on 35M4 Feeder

4 8 (+1) 6

Total outages on 35M9 Feeder

2 4 3 (+1)

Total outages on 35M10 Feeder

11 16 (+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

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• 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

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• Submitted a five-year (2015-2019) rate application to the OEB in July 2014

which includes plans to significantly invest in Toronto’s aging electricity grid

• Expect a decision in Q2 2015

• $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 2015-2016)Rebuilding the overhead infrastructure by replacing poles and transformers.

5. Shalmar and Vesta Rear Lot Conversion (Scheduled for 2017-2019)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 ProgramMaintenance activities in Ward 21 include:• Lines and stations inspections• Pole testing• Equipment upkeep (e.g. Switches)• Tree trimming• Defect correction

Maintenance Expenditures in Ward 21:• We are proposing to expand our maintenance program by

$50,000 to $410,000/ year (2015-2019, subject to regulatory approval)

• Completed a $360,000/ year program (2011-2014)

Tree trimming – Feeder Program:

Green Area – completed in 2014

Purple Area – to be completed in 2015

Yellow Area – planned for 2015 based on proposed increase in funding levels

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