Water Energy Nexus
© 2006 San Diego Gas & Electric Company. All copyright and trademark rights reserved.
Water Energy Nexus
Water generates energy; Energy moves water
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Energy is embedded in water use. By conserving water,
the amount of energy needed to pump, transport, treat, and
dispose of water is also reduced
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Water-use efficiency has been identified as the largest
single new supply available for meeting the state’s growing
water demand over the next 25 years
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Water Energy Nexus
Water agencies are the largest energy end-users
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California’s consumption of water-related energy represents:
 19% of the state’s electricity
 30% of its natural gas
 88 billion gallons of diesel fuel
… and the demand is growing!
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Water Energy Nexus
California’s Water Action Plan
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Model California’s successful energy efficiency programs
 California’s per capita energy consumption has remained
relatively flat since 1973
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Water Energy Nexus
California’s Water Action Plan
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Cut the amount of energy needed by water utilities for
pumping, purification systems, and other water processes
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Reduce energy waste from causes such as system leaks,
poorly maintained equipment, defective meters, and
improperly operated systems
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Water Energy Nexus
Current SDG&E programs save both energy and water
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Some reduce the energy needed to heat water:
 Clothes washer rebate (in partnership with SDCWA)
 ShowerStart showerhead rebate
 Free Home Energy & Water Savings kit
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Others conserve water from increased efficiency:
 Commercial HVAC-related programs (cooling towers)
 Variable frequency drives on water pumps
 High-efficiency motors in pumping stations
 Micro-bubble filtration systems
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Water Energy Nexus
Energy/Water Pilot Programs
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The Energy Commission’s 2005 Water Energy Report
asked whether the regulated energy utilities can and
should do more to promote water conservation
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In 2007, the larger IOUs were tasked with developing
Water/Energy Pilot programs
 Develop partnerships with water agencies
 Undertake jointly-funded water conservation programs
 Evaluate and measure the results
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Water Energy Nexus
Energy/Water Pilot Programs
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The pilot programs focused on cold water energy savings
(production, transportation, use, treatment, and disposal)
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SDG&E developed and managed three Water/Energy Pilot
programs:
 Large Company Audits
 Managed Landscapes
 Recycled Water
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The pilots were completed December 31, 2009 and the
results are due out later this year
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Water Energy Nexus
What’s next?
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An updated CEC Water Energy report is due out mid-2010
If cost-effective energy and water savings can be
demonstrated, SDG&E and the other IOUs may add water
conservation programs to their energy efficiency portfolios
SDG&E is proud to be a part of the critical effort to address
California’s growing demand for both energy and water
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Water Energy Nexus
Janis Heppell
[email protected]
2009 California Water Action Plan
waterplan.water.ca.gov/
2005 California Energy Report
http://www.energy.ca.gov/2005publications/CEC-700-2005011/CEC-700-2005-011-SF.PDF
SDG&E’s Complimentary Home Energy & Water Savings Kit
sdge.com/residential/energyefficiencykit/
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