1 water/energy relationship at sdg&e 17 april 2014san diego gas & electric presentation

San Diego Gas & Electric Presentation 1

Water/Energy Relationship at SDG&E

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SDG&E Water Connection

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One Year’s Difference in Snowpack

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San Diego Gas & Electric Presentation

Nexus

4

The water-energy relationship is typically quantified via the energy intensity of water measured in kilowatt-hours or therms per acre-foot (kWh or Therms/AF).

Energy intensity is calculated as the total amount of energy required to move a unit of water.

Different water supplies have different energy intensities; imported water is among the most energy intensive (especially in Southern California).

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San Diego “Au Natural”

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History of the Water/Energy in California

Water – Energy Relationship in CA• Water-related energy use is about 20% of total electric

consumption and 30% of total therm consumption in California• 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 embedded upstream and

downstream of the water customer• In Southern California, majority is due to conveyance17 April 2014


Current Energy Division Policy

• Current Policy does not allow IOUs to claim embedded savings

• Methodology of calculating the embedded savings needs to be agreed upon and unified

• Right now only “DIRECT” energy savings can be claimed

• Currently there is no agreement on how much embedded energy usage is in transfer/conveyance/ heating of water or where the savings can be claimed

• After a CPUC workshop held in May 2013 it was determined energy intensity varies widely by region

• Navigant has been hired by the CPUC to determine energy intensity by region w/in the State

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Water/Energy Uses

Water infrastructure requires energy use in almost every segment and facility.

The typical energy consuming segments of the water infrastructure:

Supply and Conveyance - Reservoirs, canals, pump stations and groundwater pumps that produce and transport raw, untreated water. Examples include many of the facilities that the State Water Project and Colorado River Aqueduct operate.

Water Treatment Water Distribution Wastewater Collection Wastewater Treatment Recycled Water Treatment Recycled Water Distribution

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Water Conservation and Energy Savings

Direct vs. Indirect Energy Savings• Direct energy savings are those that 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• Are due to the customer’s reduction in use of some other resource

• Energy embedded in water upstream and downstream of a water customer can be saved if that customer reduces their water use

• Direct water savings = Indirect energy savings

• Estimated embedded energy intensity for urban water throughout California• Southern California: 13,000 kWh/MG17 April 2014


Three Levels of Water/Energy Efficiency

Type of measure Example opportunities

1. Energy savings associated with water Efficient water heater

2. Combined water and energy savings for end user Low flow showerhead

3. Water conservation only (upstream/ embedded energy) High efficiency toilet

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SDG&E’s History w/San Diego County Water Authority

• SDG&E has a twenty plus year relationship with SDCWA• Through our decades-long Partnership some of our

achievements include:– Giving out half a million low-flow showerheads– Helping small businesses w/water equip installations, at

low or no-cost– Making high-efficiency washers affordable for customers

through our joint rebate program• Established a formal Institutional Partnership with SDCWA in

2008

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SDG&E Efforts for2013-2014 Program Cycle

• What’s New in 2013-2014?– Institutional Partnership with San Diego County Water

Authority• Per the Decision the CPUC mandated efforts for

Water/Energy Nexus include:– Leak Loss Detection– Pressure Management

– This effort will be rolled out to SDCWA and member agencies – Two of the more successful SDG&E Water Pilot programs have

been incorporated as part of this effort:• A landscape efficiency component will be made available to

commercial properties with an excess of 4 irrigated acres using monitored weather technology sensors

• A North County detention center will be retrofit with flush valve controllers, low flow shower heads and toilets

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Leak Loss Detection

• High value targets will be those w/high energy intensity and/or embedded energy coupled with high levels of leakage

• Acoustic leak detection equipment will be utilized to “listen” for leaks and make corrections

• Water loss through leakage is directly related to system pressure. Reducing pressure, where possible, will reduce leakage

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Pressure Management

• Basic tenets of program will remain the same as in the original SCE pilot held in 2008-2009.

• Water loss through leakage is directly related to system pressure and , where possible, will reduce pressure

• Pressure Zones or entire systems may have gradually been increased due to low pressure complaints and/or poor design

• Zones can be adjusted either with current equipment in place or with installation of flow-modulated pressure reducing valves

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WaterSmart Landscape Efficiency Project

• The program targets commercial properties with at least four acres of irrigated landscaping. An audit is performed and landscape equipment will be repaired/replaced/added to and monitored for up to a year.

• CA Landscape Contractors Assn (CLCA) will be administering the program.

• SDCWA will provide monies for materials for the program as part of their participation in the Partnership. SDG&E will cover admin and labor costs.

• There is no cost to the end user.• A minimum of 20% savings is the goal for this program.

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North County Detention Center Water Retrofit

• Flush valve controllers, low flow showerheads, low flow toilets will be installed at facility

• Material funding will be provided by SDCWA• Parlaying existing Partnership relationship between the

County of SD and SDCWA• 400 acre feet of water savings achieved at Bailey prison

during 2008-2009 water pilot

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UC Davis Study

• UC Davis was hired by PG&E to do an energy intensity study within their region in partnership with EBMUD

• SDG&E has hired UC Davis to do a similar study with an appropriate water district in our territory

• This effort is being co-funded by the SDCWA Partnership, Emerging Technology, and the EM&V group

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What We Prefer San Diego to Look Like

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The End!

Questions?http://

www.sdge.com/rebates-finder/business

http://www.sdge.com/buyers-guide/399

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http://www.sdge.com/rebates-finder/business

http://www.sdge.com/rebates-finder/business




1 water/energy relationship at sdg&e 17 april 2014san diego gas & electric presentation

Documents

water customer

water conservation

water infrastructure

direct water savings

urban water

water efficient water

waste water

combined water