Wildfire

Mitigation PlanBrief to California Public Utilities Commission

13 February 2019

Ismael Bills – Vice President of Operations

Lenneal Gardner – Corporate Counsel

Collin Sullivan – Director of Engineering

• Mission and Commitment

• Objectives

• Overview of TBC Facilities

• Risk Assessment

• Actions & Mitigations

Agenda

To provide a safe and reliable source of electrical transmission for the City of San Francisco while maintaining

the highest ethical standards and providing a rewarding environment for employees, investors, and stakeholders.

TBC’s commitment to safety and reliability reflects our respect for the impact our business has on the Bay Area

community.

TBC Mission & Commitment

Upcoming 2019 Wildfire Season

• Enhance fire awareness, prevention, and training for staff

• Comprehensive assessment of fire monitoring and awareness systems

• Continued planning for seismic hardening projects

Prior to Next Plan Filing

• Implementation of identified system upgrades

• Implementation of mitigants identified in WMP Risk Assessment

Next 5 Years

• All potential fire risks identified fully mitigated

Objectives

•Overall System

•Pittsburg Converter Station

•Potrero Converter Station

Overview of TBC Facilities

Overall System

Potrero Converter

Station

115kV

Pittsburg Converter

Station

230kV

Submarine HVDC

Cable

200kV

Potrero Converter Station

TBC Potrero

Converter Station

115kV

PG&E

115kV

“Substation A”

115kV AC Cable

Duct Bank

115kV AC Cable

in Underground

Duct Bank

200kV DC Cable

in Underground

Duct Bank

200kV DC Cable

Underground

Horizontal

Directional Drilled

Conduit

200kV DC

Submarine

Cable

City of

San Francisco

Overhead ViewInfrastructure Elements

Pittsburg Converter Station

200kV DC

Submarine Cable200kV DC Cable

Underground

Horizontal Directional

Drilled Conduit

200kV DC Cable in

Underground Duct Bank

TBC Pittsburg

Converter Station

230kV

City of Pittsburg

PG&E

115kV

Pittsburg

Substation

230kV AC Cable in

Underground

Duct Bank

Overhead ViewInfrastructure Elements

•Bay Area Wildfire Risk Assessment

•Consequence Rating

•Modalities of Risk Realization

Risk Assessment

Bay Area Wildfire Risk Assessment

Tier 2

Elevated

Tier 3

Extreme

CPUC Bay Area Fire Map

CAL FIRE

Fire Resource Assessment Program

Bay Area Communities

at Risk from Wildfire

Extremely Severe• Catastrophic and wide spread damage to wildlands and bordering communities

• High potential for loss of life

• Significant long-term health effects attributable to fire

• Extensive Destruction of private and public property

• Damage exceeding $100 million

• Extended periods of outage to achieve restoration

Consequence Rating

• Ignition of vegetative fuels proximate to Pittsburg Converter Station

• Seismic events leading to equipment derangement

• Derangement of infrastructure from uncoordinated excavation

Modalities of Risk Realization

Ignition of Proximate Vegetative Fuels

Proximate

Vegetative

Fuels

TBC Pittsburg

Converter Station

Ignition of Proximate Vegetative Fuels

TBC Pittsburg

Converter Station

Main Transformers

Fire Lane

12 ft Concrete Wall

Proximate

Vegetative Fuels TBC Pittsburg

Converter Station Nearby

Residential

Community

Seismic Event Leading to Fire

Derangement from Uncoordinated Excavation

• Continue with program of seismic hardening

• Assess implementation of additional fire suppression systems

• Implement real-time cable monitoring system

• Third-party review of fire prevention measures

Actions & Mitigations

Questions

&

Answers