Vegetation Management

1. Vegetation Management Pacific Gas and Electric Company System and San Francisco County Overview Presented byJoel Smith / PG&EForesterArea 1Vegetation Management

2. Basic Electric System Transmission Substation Power Plant • Nuclear • Hydroelectric • Geothermal • Natural Gas Power Generated at 13 - 25 kV Transmission Line 60, 115, 230 or 500 kV Possible NERC regulation Distribution Line 4, 12, 17 or 21 kV Business Home or Business 120 - 480 Volts Distribution Substation Home

3. Compliance Requirements PRC 4293 – Utility Vegetation Management - Tree Pruning/Removal • Maintain 4 feet of clearance between trees and primary distribution power lines and 60/70 KV transmission lines • Maintain 10 feet of clearance between trees and all transmission lines 115 KV and above • Remove dead, diseased, defective and dying trees that could fall into the lines (facility protection trees) PRC 4292 – Utility Vegetation Management – Pole Clearing • Clear 10’ x 8’ cylinder around the base of subject poles and transmission structures • Remove dead vegetation up through the primary conductor level CPUC G.O. 95 Rule 35 – Utility Vegetation Management – Tree Pruning/Removal • Maintain 18 inches of clearance between trees and primary distribution power lines and 60/70 KV, greater clearances for higher voltages • Remove facility protection trees (as defined above) • Address situations where trees cause strain or abrasion on secondary conductors NERC Standard FAC-003-1 – Vegetation Management Requirements for Transmission • Minimum Clearance Standard based on voltage class • Zero tolerance for vegetation caused outages

4. HIGH VOLTAGE California Regulations for Distribution Lines GO-95 Rule 35 PRC 4293 PRC 4292 18 in. 18 in. 4 ft. 4 ft. 8 ft. 10 ft.

5. Routine T&D Vegetation ManagementProgram Scope • Address through trim or removal, any tree that will encroach within minimum clearance distances and any hazard tree to maintain regulatory compliance. • 113,00 miles of distribution line • 19,500 miles of transmission line • 70,000 square mile service territory • Trim or remove over 1.2M trees per year • 5M trees in inventory with potential to “grow into” conductors • 50M trees with potential to “fall into” conductors • Maintain fire breaks on 120,000 subject poles • Maintain transmission right of way

7. PG&E Distribution Tree Trimming • The Routine Patrol Standard – Defined Scope of Work • The Annual Patrol: Inspect 100% of overhead line, identify and clear only trees that will encroach before next cycle. • Aggressively target trees up to 12” DBH, palms, and fast growers for removal • Pruning for 2 to 3 years clearance • Hazard trees • Strain or abrasion on secondary lines • Pruning Standards – Utility Pruning BMP • 600+ contract tree crews • 350+ utility arborists/foresters • Approx 60 PG&E office and field personnel

8. Territories

9. Tools 1) Right Tree Right Place 2) Work Practice • Inspection, pruning and removal • ROW and NERC Standards 3) Emergency Operations

10. Tell me what’s missing…

11. Customer Interface Consistent graphics and language to comprise our educational presence across all communication channels to both internal and external audiences.

12. City challenges…230 Magellan

13. 19 Maywood

14. 217 Tocoloma

15. 240 Casitas

16. “If a tree falls in the City, and there is no one there to hear it, will it still…hit a car?”

17. Contact Information Joel Smith, Forester (local project manager) San Francisco and San Mateo Counties • Office 650.985.5710 • Cell 650.477.8874 • jpsr@pge.com