Inquiry into the High Incidence of Power Outages for the City of Yellowknife 1
AGENDA Introductions North of 60 electrical systems Yukon Electrical Ltd. Northland Utilities (NWT) Ltd. Northland Utilities (YK) Ltd. Reliability Indices Definitions SAIFI, SAIDI, CAIDI North of 60 Comparisons Reliability Indices NUL Reliability Indices Answers to PUB questions December 12, 2012 Summary 2
INTRODUCTIONS Duane Morgan, Manager Northland Utilities (Yellowknife) Limited 38 years of service All in the North • 20 Years in the Yukon • 18 Years in the NWT Extensive experience in the operations and maintenance of northern power systems Will be doing the overview this morning 4
INTRODUCTIONS Kevin Lailey, Operations Superintendent Northland Utilities (Yellowknife) Limited 23 years of service Extensive experience in the operation of distribution power systems and implementation of maintenance programs throughout Northland Utilities service area and ATCO Electric service areas
INTRODUCTIONS Phil Borgel, Senior Engineer Yukon Electrical Limited Northland Utilities Limited 22 years of service Background in Developing Standards, design work, and now providing Senior Engineering services to the Yukon, NWT and ATCO Electric
INTRODUCTIONS Christina Chorostkowski, Engineering Assistant Northland Utilities (Yellowknife) Limited 7 years of service Provides design work and estimates for customers wanting electrical services Does all NUL schematic drawings (MicroStation & AutoCAD) Keeps the statistical records on system performance
Yukon Electrical Hydroelectric Grid Multiple source interconnected Grid Diesel backup Yukon Energy Corp. Breakers Auto Reclose
Northland Utilities (NWT) Limited Taltson hydroelectric grid NTPC Operated Diesel backup NUL Operated Breakers Auto Reclose
Northland Utilities (Yellowknife) Ltd. Snare hydroelectric grid NTPC Operated Bluefish hydroelectric grid NTPC Operated Diesel back up NTPC Operated Breakers Non Auto Reclose
RELIABILITY INDICIES SAIFI – System Average Interruption Frequency Index The average number of interruptions per customer served • FREQUENCY SAIDI – System Average Interruption Duration Index The system average interruption duration for customers served • HOURS WITHOUT SERVICE CAIDI – Customer Average Interruption Duration Index The average duration of a interruption, for customers who have experienced interruptions • RESTORATION TIME
NORTH OF 60 RELIABILITY INDICIES Table 1.0 SAIFI SAIDI CAIDI UNPLANNED PLANNED LOSS OF OVER UNPLANNED PLANNED LOSS OF OVER UNPLANNED PLANNED LOSS OF OVER SUPPLY ALL SUPPLY ALL SUPPLY ALL Yukon Electrical Ltd. 0.25 0.17 1.74 2.16 0.32 0.45 1.12 1.89 1.26 2.61 0.64 0.88 Northland Utilities (NWT) 1.82 0.28 2.76 4.86 0.33 0.42 1.35 2.1 0.18 1.49 0.49 Ltd. 0.43 2010 Northland Utilities (YK) 1.09 10.1 0.48 0.35 5.73 6.56 0.44 2.97 0.64 Ltd. 0.12 8.89 0.65 CEA Rural Utilities 7.06 2.55 2.77 Yukon Electrical Ltd. 0.88 0.28 3.2 4.36 0.75 0.72 3.85 5.32 0.85 2.56 1.2 1.22 Northland Utilities (NWT) 0.12 0.2 11.59 11.91 0.12 0.56 3.83 4.51 0.99 2.8 0.33 Ltd. 0.38 2011 Northland Utilities (YK) 1.58 17.22 1.83 0.25 5.77 7.85 1.15 0.94 0.38 Ltd. 0.27 15.37 0.46 CEA Rural Utilities 7.53 2.98 2.53 Yukon Electrical Ltd. 0.92 0.11 0.94 1.97 1.4 0.27 0.53 2.2 1.53 2.37 0.56 1.12 Northland Utilities (NWT) 2.43 0.9 9.5 12.83 2.71 1.83 2.86 7.4 1.12 2.04 0.3 Ltd. 0.58 2012 Northland Utilities (YK) 1.76 17.31 1.15 0.52 8.15 9.82 0.65 5.86 0.53 Ltd. ** 0.09 15.46 0.57 CEA Rural Utilities - NOT AVAILABLE AT THIS TIME
NUL – RELIABILITY INDICIES 2009/2010, 2010/2011 & 2011/2012 Table 2.0 SAIFI SAIDI CAIDI UNPLANNED PLANNED LOSS OVERALL UNPLANNED PLANNED LOSS OVERALL UNPLANNED PLANNED LOSS OVERALL OF OF OF Total SUPPLY SUPPLY SUPPLY Outag es 2009/2010 57 0.27 0.05 9.40 9.72 0.30 0.22 3.72 4.24 1.13 4.11 0.40 0.44 2010/2011 100 2.22 0.13 13.07 15.42 1.82 0.22 7.88 9.92 0.82 1.71 0.60 0.64 2011/2012 118 ** 1.84 0.23 18.83 20.90 1.30 0.20 8.28 9.78 0.70 0.89 0.44 0.47 Average 78.50 1.44 0.14 13.77 15.35 1.14 0.21 6.63 7.98 0.88 2.24 0.48 0.52 ** Feb 2012 helicopter crash not included
Northland Utilities (YK) Ltd. Top Four Causes Table 3.0 Number of Outage Events ( Feb 2012 helicopter not included) Cause Overall Cause Percentages 2009/2010 2010/2011 2011/2012 Unknown/Other 6 15 16 13% ** Outage Planned 12 25 29 25% ** Supply Lost 16 27 38 29% ** Tree Contact - - 1 0.4% Lightning 1 - - 0.4% Defective Equipment 9 5 7 8.0% Weather - - 1 0.4% Adverse Environment - 2 - 7.0% Human Element 1 2 - 1.0% Foreign Interference 12 24 26 22% ** 57 100 118 275 Total Outages During 2009/10, 2010/11, & 2011/12 Total Number of Power Outages
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BIRD DETERANT
IS THERE AN INCREASE…? …In the incidence of outages measured by number? There was an increase in the number of outages year to year 2010 – 57 outages 41 not including loss of supply 2011 – 100 outages 73 not including loss of supply 2012 – 118 outages 80 not including loss of supply (February 2012 helicopter crash not included) …In the incidence of outages measured by impacted customers? There was an increase in the number of customers impacted year to year 2010 – 77,508 customers 2,558 not including loss of supply 2011 – 122,997 customers 18,743 not including loss of supply 2012 – 166,645 customers 16,494 not including loss of supply (February 2012 helicopter crash not included) …In the incidence of outages measured by duration? There was a increase from year to years in the total duration 2010 – 33,835 customer hours 4,155 not including loss of supply 2011 – 79,136 customer hours 16,270 not including loss of supply 2012 – 77,942 customer hours 11,934 not including loss of supply (February 2012 helicopter crash not included) 5
CORRECTIVE ACTIONS Have an extensive list of actions in place already. Operations & Maintenance System Improvements Fuse Co-ordination Plan Breaker to Breaker Protection EXAMPLES 25kV Conversion Project – Completed in 2012 Wildlife Protection Program – Completed by 2013 Monthly meetings with NTPC – Ongoing 5
WHAT IS AN ACCEPTABLE LEVEL…? Northland Utilities (YK) Ltd. will continue to monitor the new 25kV distribution power system. 5
HOW TO REPORT? Industry Standards SAIFI, SAIDI & CAIDI Annual Reporting Starting at NUL’s next GRA Data/Results will be utilized to influence O&M, and system improvements 5
SUMMARY Northland Utilities believes that with the recent upgrades on the supply side (Bluefish), as well as, the completion of the 25kV Conversion on September 21, 2012 Positive effect on customers Duration of outages will be lessened in future years. In addition with on going maintenance programs, inspections and system improvements NUY would like to suggest we continue to monitor our respective systems and provide a full reliability report at the time of our next GRA. This would offer a true reflection of the Yellowknife distribution system improvements put into service from the recent upgrades to our system (25kV Conversion). 5
Thank you 7
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