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Tree-trimming Standards and Practices

Tree-trimming Standards and Practices. City Council Work Session November 19, 2007. Introduction. Two General Categories - Transmission - Distribution Work Performed by Outside Contractor

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Tree-trimming Standards and Practices

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  1. Tree-trimming Standards and Practices City Council Work Session November 19, 2007

  2. Introduction • Two General Categories - Transmission - Distribution • Work Performed by Outside Contractor - ANSI A300 (Tree Care Operations – Tree, Shrub, and other Woody Plant Maintenance – Standard Practices) - Interpretation and Implementation of A300 - Line clearances to GP&L standards • Line Clearances - Transmission Standard (GP&L OH-907) - Distribution Standard (GP&L OH-908)

  3. Transmission Standards Overview • Subject to NERC Standard FAC-003-1 • Lists ANSI A300 as industry “best practice” for vegetation management • Transmission Vegetation Management Program (TVMP) per FAC-003-1 • Passed ERCOT/NERC audit this year • Liable for ALL vegetation related outages • Increased penalties under nodal market

  4. GP&L Standard OH-907

  5. Typical Transmission Standard • Zones defined by the TVMP - Border zone requires documented plan - Wire zone requires immediate resolution

  6. New Transmission Design • New transmission design increases clearances

  7. Transmission Standards Outlook • Development along transmission corridors - Increase compliance effort - Increase in vegetation encroachments - Increase interaction with property owners • Reduce this impact by providing information to property owners along transmission corridors. • Improve corridor access to insure timely identification of potential encroachments.

  8. Distribution Standards Overview • Majority of annual trimming operations • Not currently subject to regulatory audits • Line clearances per GP&L OH-908 • Contractor adheres to ANSI A300 for vegetation management • Trimming format (V-out, side, notch, etc.) chosen to provide desired clearances without killing tree. • Trunk location typically dictates trim format

  9. GP&L Standard OH-908

  10. Distribution Standards V-OutFormat

  11. Distribution Standards SideFormat

  12. Distribution Standards NotchFormat

  13. Distribution Standards Outlook • NERC regulatory voltage will continue to be lowered – distribution may be subject to standards in the near future? • Increased trimming in past 3-5 years – greatly reduced storm related outages • System reliability directly affected by magnitude of trimming operation • Enhance customer notification process • Provide information on clearance requirements to property owners

  14. QUESTIONS? Balancing aesthetics & reliability!

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