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					    Emission Reduction Strategy:
Prioritizing Repairs & Replacements



                              Anastasia O’Malley
                                 Theo Theodorou
         Consolidated Edison Company of New York
                                February 4, 2009

                                                1

                                            ON IT
Agenda

• Con Edison’s electric system
• Emission reduction strategy
• Data collection and analysis
• Equipment maintenance
• Leak detection methods




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Con Edison Electrical System Overview

                   •   3.2 million electric customers
                   •   660 square miles
                   •   13,775 MW peak load
                   •   94,000 miles of underground cable
                   •   36,000 miles of overhead cable
                   •   98 Substations
                        • 38 transmission
                        • 60 distribution
                   • Stringent reliability requirements

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Substation SF6 Nameplate Capacity

• 345 kV circuit breakers
• 138 kV circuit breakers
• 69 kV circuit breakers
• GIS bus sections (138 kV / 345 kV)
• Circuit switchers
• Autoground switches



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                                       ON IT
                                          SF6 EPA MOU STATUS


350,000   365,930


300,000


250,000             278,991
                                        258,494
                              251,141

200,000                                           223,129
                                                                 212,796
                                                                               193,701       187,953
150,000

                                                                                                       137,149
100,000
                                                                                                                 96,551
 50,000
                                                                                                                            61,040

    -
           1996      1999     2000       2001      2002           2003         2004           2005     2006      2007       2008
                                                                  year


                                                  Act ual Emissions        MOU Commit ment
                                                                                                                               5

                                                                                                                          ON IT
2008 Leak Reduction Efforts

• 138 kV Circuit Breakers - 20 replaced, 13 repaired
• 345 kV Circuit Breakers - 5 replaced, 21 repaired
• Auto Ground Switches - 2 replaced, 5 repaired, 4 retired
• Circuit Switchers - 5 repaired
• GIS - 3 sections repaired
• SF6 Yard Manifolds - 1 replaced, 1 retired

                                                                 6

                                                             ON IT
2007 Leak Reduction Efforts

• 138 kV Circuit Breakers - 11 replaced, 9 repaired
• 345 kV Circuit Breakers - 9 replaced, 2 repaired
• Auto Ground Switches - 4 replaced, 1 repaired, 4 retired
• Circuit Switchers - 1 repaired
• SF6 Yard Manifolds - 1 repaired



                                                             7

                                                        ON IT
Emission Reduction Strategy
• Cultural change - emissions are unacceptable
• Training - proper handling and use of gas carts
• Simplified process – recording of gas usage
• Expedited identification of leaks
• Accurate measurement and/or estimate of gas used
• Visualization of gas usage – top leakers




                                                         8

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                                                                    Number Being Gassed




                                                       0
                                                           5
                                                               10
                                                                      15
                                                                             20
                                                                                   25
                                                                                          30
                                                                                               35
                                                                                                    40
                                       AG
                                              S

                          W
                           E
                                  ST
                                          13
                                            80

                         W
                          E
                               ST
                                      C
                                          AS
                                            P

                              W
                               E
                                   ST
                                          SF
                                             A



                                          G
                                              IS


                                  G
                                      E
                                          AT
                                             B


                               AB
                                      B
        C                                 SF
            IR                               P
                 C
                     U
                         IT
                              SW
                                IT
                                   C
                                          H
            M                                 ER
             E                                     S
                 RL
                    IN
                              G
                               E
                                   RI
                                      N
                                           G
            C                               FA
                                                                                                         Gas Use By Equipment Type




                 O
                     G
                      EN
                              E
                                  L
                                      FX
                                        -2
                                          2D


                              IT
                                 E
                                      M
                                       O
                                           D
                                               C
ON IT
        9
Emission Reduction Strategy


• Use SF6 cameras prior to equipment outages
• Monthly leak checks of ancillary equipment
• Expedite equipment repairs




                                                  10

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Typical Leak Locations
                          Solder Seal




                                     Bushing Base




                                     Tank Flange




                High Pressure Tank           11

                                          ON IT
  Control Cabinet Leaks




Gas
Compressor
                            Air
                           Tank



  Valve

             Piping Connection       12

                                  ON IT
Leak Detection Cameras
        GasVue           GasFind




                                      13

                                   ON IT
Leak Detection Cameras

KEMA Acoustic Detector   Sherlock Imaging Spectrometer




                                                  14

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Solder Seal Leak




                      15

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High Pressure Tank Leak




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Inventory Management


 Weighed cylinder inventory   Measured gas usage




                                                      17

                                                   ON IT
Emissions Reduction Program
• Cultural change - emissions are unacceptable
• Collect leak data and quantify
• Document video files of leaks and corrective actions
• Prioritize outages – repair or replacement
• Aggressive equipment replacements
• Inventory management
• Research & Development
                                                            18

                                                         ON IT
Con Edison - Committed to Environmental Excellence




   Perito Moreno Glacier, Lake Argentina, Patagonia, Nov. 2001   19

                                                           ON IT

				
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