1

PSPS Scope Overview

October 18, 2019

2Following the wildfires in 2017 and 2018, some of the changes included in this presentation are contemplated as additional precautionary measures intended to further reduce future wildfire risk.

JUNE 8 - 9 SEPT 23 - 26 OCT 5 - 6 OCT 9 - 12

~22,000 customers impacted

~75,000customers impacted

~11,000 customers impacted

~738,000 customers impacted

5 counties in scope 7 counties in scope 3 counties in scope 35 counties in scope

4 Community

Resource Centers

8 Community

Resource Centers

3 Community

Resource Centers

30+ Community

Resource Centers

63 MPH peak wind

gusts recorded

58 MPH peak wind

gusts recorded

51 MPH peak wind

gusts recorded

77 MPH peak wind

gusts recorded

5 system damage/

hazard incidents

4 system damage/

hazard incidents

2 system damage/

hazard incidents

100+ system

damage/hazard incidents

2019 PSPS Overview

3Following the wildfires in 2017 and 2018, some of the changes included in this presentation are contemplated as additional precautionary measures intended to further reduce future wildfire risk.

October 9 - 12 PSPS Event Footprint

1.6MCUSTOMERS

~2.1MCUSTOMERS

~738KCUSTOMERS

~

Red Flag Warning (National Weather

Service) Fire Index Area

Actual Scope

3.8MCUSTOMERS

~

North Ops and South Ops

Predictive Services

4Following the wildfires in 2017 and 2018, some of the changes included in this presentation are contemplated as additional precautionary measures intended to further reduce future wildfire risk.

800,000

700,000

600,000

500,000

400,000

300,000

200,000

100,000

0

Oct9

Oct10

Oct11

Oct12

October 9 - 12 PSPS Event Hourly Impacts

“All Clear” issued

Phase 1Key Takeaways

• Grid reconfiguration

allowed ~48k customers to be re-energized ahead of “All Clear”

• Nearly all customers restored within 48 hours of “All Clear”

• Backup generation was provided to 10 critical facilities, including:

▪ Caldecott Tunnel▪ BART Control Sites (2)▪ Angwin Resilience

Zone/Calistoga

CU

STO

MER

S W

ITH

OU

T P

OW

ER

DAYS

Phase 2

Note: Phase 3 de-energization (Kern, ~4,000 customers) occurred on 10/10 but is not noted on this diagram

5Following the wildfires in 2017 and 2018, some of the changes included in this presentation are contemplated as additional precautionary measures intended to further reduce future wildfire risk.

October 9 - 12 PSPS Event Scope

• High resolution forecast map of peak wind gusts

• Peak wind gusts and Fire Potential Index are key inputs to the PSPS scope

• While the map represents the forecasted conditions, during the event the National Weather Service recorded the following:

o 22 counties with peak wind gusts

above 40 MPH

▪ 15 of which experienced peak wind

gusts above 50 MPH

40MPH

Confirmed hazards/damage

PSPS impact areas

PEA

K W

IND

GU

STS

(mile

s p

er

ho

ur)

HUMBOLDT

SIERRA FOOTHILLS

NORTH BAY

EAST BAY

SOUTHBAY

KERN

6Following the wildfires in 2017 and 2018, some of the changes included in this presentation are contemplated as additional precautionary measures intended to further reduce future wildfire risk.

Grid Configuration Example - City of Pinole

Circuits

Circuits in HFTD area

HFTD area

Substation

7Following the wildfires in 2017 and 2018, some of the changes included in this presentation are contemplated as additional precautionary measures intended to further reduce future wildfire risk.

100+ INSTANCES OF

DAMAGE/HAZARDS

October 9 - 12 PSPS Event Damage/Hazards

COLUSA COUNTY

NAPA COUNTY

8Following the wildfires in 2017 and 2018, some of the changes included in this presentation are contemplated as additional precautionary measures intended to further reduce future wildfire risk.

Reducing PSPS Impacts

PG&E has made and will continue to make improvements on its system to reduce the impact and scope of PSPS on its customers

Sectionalizing Devices

Resilience Zones

Backup Generation

Transmission Resiliency

Permanent Microgrids

Distributed Generation