Storage Applications at PG&E

Dave Gabbard and Mike MedeirosPacific Gas and Electric Company

STORAGE BACKGROUND

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Regulatory Context: CPUC Energy Storage Mandate

Decision 13-40-040the “Energy Storage Mandate”

Approved by CPUC October 2013 Stemmed from AB 2514

IOUs can own up to 50% of targets

Flexibility in targets: Between T/D/customer

buckets Between years

Utilities to host biennial solicitations through 2020

Energy Storage Use Cases

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PG&E BATTERY ENERGY STORAGE EXPERIENCE

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Existing Battery Energy Storage Pilots at PG&E

Project Initiation: 2007Operational Date: May 2013Completed Islanding Commissioning: Sep 2013

Current Use Cases: Daily peak shaving, with half energy reserved for

islanding/backup for the adjacent customer facility CAISO market participation started in Jan 2016

Yerba Buena 4 MW / 28 MWh NAS Battery

Customer R&D Facility, San Jose

Vaca Dixon2 MW / 14 MWh NAS Battery

Vaca-Dixon Substation

Project Initiation: 2007Operational Date: August 2012Commenced CAISO Market Ops: Aug 2014

Current Use Cases: 100% dedicated to CAISO wholesale market

participation

Latest addition: Browns Valley Energy Storage

Site

EPIC Program (R&D) funded project Separate fence from substation Connected directly to 12kV feeder

Browns Valley Energy StorageSpecs: 500 kW / 4 hour Tesla lithium-ionCommercial Operation Date: January 2017Use Case: Peak shaving

Defining Bank Load Management

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Browns Valley Conceptual

Browns Valley Actual

Llagas ES Project

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Project Site~200’ by 240’

Substation

Distribution Need: Overload on bank 3 starting summer 2022*

Project Size: 20MW / 80MWh 10MW minimum bid was based on 10

year deferral projection Bidders could propose up to 20MW

Requested Online Date: 11/1/2021

PG&E Scope: PG&E initiated interconnection Discretionary permitting Land

Use Cases: Market participation (capacity, energy, A/S) Distribution deferral

Competitively compared against 3rd party owned projects in 2016 ESRFO; competitively procured PG&E-owned project. 20MWs and 4-hour duration. Filed for CPUC approval; expected Q4 ‘18.

New Opportunities

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Transmission Asset: focused on addressing reliability needs; non-market participating.

Dinuba – 7MW/4-hour to address thermal overloads; replaced traditional re-conductoringprojects.

Oakland – Min. 10 MW/4-hour as part of portfolio of projects (substation upgrades, EE, DR, PV) to mitigate need NERC Category P2 and P6 thermal overloads and local generation retirement.

Both projects approved in CAISO 2017-2018 Transmission Planning Process (TPP).

Local Capacity: increase capacity within constrained load pockets

Moss Landing – potential 200MW/4-hour project within South Bay-Moss Landing sub-area.

Resiliency: Strategically located storage to improve

resiliency at specific feeders and/or essential customer sites.

Provide long duration (~ 48 hours) based on pre-determined conditions/events.

PG&E developing/analyzing new opportunities: 1) Transmission Asset, 2) Local Capacity and 3) Resiliency

QUESTIONS?

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