This document provides information on SDG&E's water-energy pilot programs. It discusses that water-related energy use accounts for about 20% of California's electricity consumption. SDG&E has partnered with the San Diego County Water Authority on three pilot programs - a managed landscape program targeting apartment complexes and offices, a large customer audit program, and a recycled water retrofit program. The goals are to reduce water usage and resulting indirect energy savings in the San Diego region.

1. Water/Energy Pilot
San Diego Gas & Electric
June 2, 2009
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2. What is the water – energy
relationship?
Water – Energy Relationship in CA
Water-related energy use accounts for about 20% of California’s
total electric consumption
• Water-related energy use
• End uses: heating, cooling, on-site pumping
• Upstream uses: surface conveyance, groundwater
pumping, treatment, distribution
• Downstream uses: waste water pumping and treatment
• Upstream and downstream water-related energy use in
California:
• About 12.5 billion kWh/yr is embedded upstream and
downstream of the water customer
• In southern California, majority of energy use is due to
conveyance
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3. Water Conservation and Energy
Savings
Direct vs. Indirect Energy Savings
• Direct energy savings appear on the customer’s energy
meter
• Indirect energy savings do not appear on the customer’s
energy meter
• Occur upstream and downstream of the customer
• Result from customer’s reduced usage of some other
resource
• Direct water savings = Indirect energy savings
• Energy use is embedded in producing, delivering, and
disposing of water
• A typical southern Californian urban water system uses
an estimated 13,000 kWh/MG
• Embedded energy use in water upstream and downstream of
the customer can be saved if that customer reduces their
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4. Water/Energy Pilot Background
• CPUC application filed on January 16, 2007
• Programs began July 1, 2008 and will run
through December 30, 2009
• Each IOU is partnering with local water agencies
to fund and manage the Water Pilots
• All IOUs have different programs to measure
indirect energy- and water-savings
• Residential
• Commercial
• Low-income
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5. Program funding
Program Evaluation/Stud
Utility
Funding y Funding
SDG&E $ 996,000
SoCalGas $ 586,407
SCE $ 809,500
PG&E $1,241,000
Total $3,632,907 $2,737,300
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6. Pilot Requirements
• Implementation feasibility/short planning timeframe
• Leverage existing programs where possible
• Use proven, not experimental, water-saving
technologies
• Broad range of customer segments/delivery channels
• Low-income and multi-family residential
• Educational outreach
• Commercial & Industrial (SDG&E only has commercial)
• Investigate impacts on peak demand
• Multiple agency partners and funding contributions
• Cost-effectiveness
• Pilot should identify cost-effective water conservation
measures
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• More precise definition of cost-effectiveness for

7. SDG&E Pilot Programs
SDG&E partnered with the San Diego County
Water Authority for three pilots in San Diego
Managed Landscape
• Target Market
• Apartment complexes, condominiums, office parks,
commercial properties, and homeowner associations
• Implementation Mechanism
• Selected contractor installs weather-based controllers and
tracks performance over one year
• Customers also participate in MWD’s Water Savings
Performance Plan (if funding is available)
• Status
• 14 customers enrolled in program to-date
• Projected annual water savings of more than 116 MG
• Projected annual electric savings of more than 73,200
kWh 7

8. SDG&E Pilot
Large Customer Audits
• Target Market
• Customers who have potential to save substantial water and
energy and who can act quickly to implement recommended
measures
• Implementation Mechanism
• Phase 1: SDG&E works with the Water Authority to
implement measures from previously conducted audits
• Phase 2: Contractor creates a combined Energy/Water Audit
and implements 7-10 additional Energy/Water Audits
• Status
• Phase 1: One of the three previously audited customers is in
the process of implementing measures
• Phase 2: Two customers have received an audit and one is in
process of implementing measures. Eight more are in the
pipeline 8

9. SDG&E Water Pilot
Recycled Water
• Target Market
• Customers who can act quickly to implement recycled water
programs at their facilities in the San Diego region
• Implementation Mechanism
• SDG&E, the Water Authority, and local member agencies
provides funding to retrofit 6 sites with recycled water
programs
• Status
• The Water Authority selected 6 sites to retrofit
• Retrofits are completed on 2 sites
• All sites on track to be completed by July 2009
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