Solar-to-EV Project at the San Diego Zoo

Western Underground Conference

April 10, 2013

© 2013 San Diego Gas & Electric Company. All copyright and trademark rights reserved.

Sustainable Communities Program

Goal: Work with our customers to showcase energy efficient, sustainable projects that incorporate SDG&E-owned clean generation systems

• Integrate photovoltaics, plug-in electric vehicle (PEV) chargers and energy storage with advanced communications & control systems in support of SDG&E’s Smart Grid Deployment Plan

Systems – photovoltaics, fuel cells & energy storage

• Owned, maintained & operated by SDG&E

• Typically interconnected on utility side of the meter

• No effect on customer utility bill

• SCP now has 36 projects for a total of nearly 4.4 MW

• Includes a 400 kW fuel cell

Awarded the US Green Building

Council Leadership Award

Sustainable Communities Program

This is an innovative distributed-generation program in answer to adding more renewable energy to our grid

Potential Benefits to customer:

• Collaborate with SDG&E on a Smart Grid project

• Energy Dashboard Education for occupants and visitors

• Community partner to help provide locally generated clean power

• Public Recognition – Sustainable Communities Champion Award, website, advertisement recognition & case studies

• Possible LEED® points or payment for space occupied by photovoltaics system

Potential Benefits to utility:

• Clean, renewable distributed generation on the grid

• New advanced energy storage projects will:

• Reduce intermittency from PV• Offset PEV charging• Peak shave utility peak load

• Showcases SDG&E’s environmental stewardship

Steps in the process

Contract terms:

• 20 year lease with options at years 10 and 15 to renew, purchase the energy system or request removal of the system

• Lease payment (if applicable) is paid annually, but the first five years are paid upfront

– Lease payment is $0.01/kWh per year, calculated up front based on nameplate of PV

– e.g. 100 kW PV – annual lease payment of $1,700

PV/Clean Energy Installation:

1. SDG&E issues a RFP to approved solar vendors

2. SDG&E awards the bid

3. Solar vendor designs the PV/Clean Energy system

4. Solar vendor obtains permits

5. Work with construction schedule to install the system

6. Commission the system

SCP Installations to date: 36 Projects for a total of 4,380 kW

• They collectively generate enough energy at peak production to supply 2,855 homes.

• The energy produced prevents more than 8.9 million pounds of CO2 equivalent from entering the atmosphere each year.

• The GHG savings from the electricity produced is equivalent to not driving a car 11.6 million miles, or planting over 133,000 trees.

Solar-to-EV Project at the San Diego Zoo

Project Summary

• A solar photovoltaics system harnesses energy from the sun to charge cars, store solar power for future use and provide renewable energy to the community

– 10 solar canopies of 9 kW for a total of 90 kW

– 5 Plug-In Electric Vehicle charging stations (includes an ADA accessible charging station) installed and owned by a third party

– Advanced energy storage using Li-Ion batteries – 100 kW/100 kWh

• Reduce intermittency from PV• Offset PEV charging• Peak shave utility peak load

Solar-to-EV Project at the San Diego Zoo

• The Solar-to-EV project is a collaboration between the San Diego Zoo and Smart City San Diego

• Smart City San Diego combines the resources of SDG&E, City of San Diego, University of California San Diego, General Electric and CleanTECH San Diego to improve the region’s energy independence, reduce greenhouse gas emissions and assert San Diego as a clean energy leader.

• This Solar-to-EV project will serve as a new energy infrastructure blueprint that can be replicated in the San Diego region and beyond.

San Diego Zoo Plug-In Electric Vehicle Chargers

San Diego Zoo Wide Angle View

San Diego Zoo Aerial View

San Diego Zoo Energy Storage Schematic

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KEY: # Energy Flows1 PV to Power Converter

2 Bi-directional Converter to Battery

3 Power Converter to EV

4 Bi-directional inverter to grid

1

2

3

4

PV Array

Multi-Port Converter/Inverter

AC

Battery

PV Port

ES Port ES

Port

Grid

EV Port

Port

Grid

GRID

Meter

Meter

DC

PowerConverter

San Diego Zoo Energy DashboardEducation

San Diego Zoo Energy DashboardGreen Features

San Diego Zoo Energy DashboardSDG&E’s Environmental Stewardship

Case Study - Energy Innovation Center

Roof Top Solar: 47 kW SDG&E-owned system

Six Solar Trees® create a Solar Grove®: 62 kW SDG&E-owned system

• Newly developed solar tracking technology will increase energy production ~20% compared to stationary systems

• Integrated with advanced energy storage

• Plug-in electric vehicle (PEV) chargers

©Envision Solar International, Inc.

Ted Walton Photography

Case Study - Energy Innovation Center

• Education dashboard showcasing the rooftop vs. the solar grove production

©Envision Solar International, Inc.

Ted Walton Photography

Newest Projects

• Click to add text

– Next level text here UC San Diego Structural Materials Engineering Bldg. 120 kW photovoltaic system – Seeking LEED® Gold

UC San Diego Charles David Keeling Apts.41 kW photovoltaic system – LEED Platinum

Sharp Rees-Stealy Medical Center Downtown120 kW photovoltaic system – Seeking LEED Gold

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connected…..to the sun

• Two pilot programs: Share the Sun and SunRate

• Programs to add 20+ MW of local solar

• Pending Commission Approval

Integrating Renewable Energy into the Distribution System

Sustainable Communities Program

• Integrates utility owned clean generation and smart grid technologies within sustainable projects

• Participants “host” generation systems by leasing space to SDG&E

connected•••••to the sun

• 2/3 of customers can’t take advantage of rooftop solar

• Expands solar to all customers -- opens new market for solar developers

• Application filed to implement two pilot program elements:

• Share the Sun -- enables customers to invest in solar systems from a solar provider

• SunRate -- allows customers to purchase green energy from local solar projects under contract to SDG&E

Connecting Customers to Solar Energy

Share the Sun

For solar providers & customers

For customers

SunRate

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connected•••••to the sunPotential Benefits

• Expands local solar access and greater alternatives to customers

– Removes site restrictions and building ownership as a hurdle to solar energy use

– Customers can lock-in their commodity price with a longer-term commitment

– Customers can take their solar subscription with them when moving

– Provides access to solar projects that have the benefits of optimal location, scope and scale

• Creates a sustainable market and new business opportunities for solar in SDG&E territory that does not rely on cross subsidies

Sustainable Communities Program

Questions?