Proposed Water-Energy Conservation Activities at PG

1

• Proposed Water-Energy Conservation Activities at
  PGE
• Low Income Oversight Board
• Watsonville, CA
• January 17, 2007
• Gerry Hamilton
• PGE

2
PGEs Current Water-Energy Activities

• PGEs current water-energy activities include
  Water-Embedded Energy research.
• April 13, 2006 the CPUC announced it would
  examine the embedded (or upstream) energy
  savings associated with water efficiency
• Over the Summer of 2006, PGE participated in a
  CPUC Workshop, Comments and Replies on
  water-embedded issues, exploring opportunities
  and issues.
• October 16, 2006 the CPUC directed the Investor
  Owned Utilities to propose a pilot on January 15,
  2007.
• Total funding 10 million (PGE 4.4 million)
• Duration 12 months starting July 1, 2007
• Partner with one (or more) large water providers
• Upstream opportunities include Examine water
  conservation, ways to use less energy intensive
  water, and improve water distribution and
  treatment systems

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PGEs Water-Embedded EnergyKey Objectives

• Critical issues to explore
• Can Electric IOUs and Water agencies effectively
  partner?
• PGE has partnered with water agencies in the
  past and looks forward to participating in more
  durable and effective partnerships
• Coordinate program design
• Improve water-energy program delivery
• Achieve larger energy savings
• Can the water-embedded energy savings be
  measured?
• Measuring water-embedded energy savings to an
  acceptable degree of precision is the critical
  challenge
• Without developing reliable and accurate
  measurements and measurement methods, savings
  cant be verified hampering program development
  for 2009
• Complex water distribution systems and water
  industry institutions may require realistic
  trade-offs between reasonably accurate average
  savings estimates and highly accurate but
  expensive incremental savings estimates

4
PGEs Water-Embedded Energy PilotProposal

• In the Pilot, PGE plans to
• Partner with three water diverse water utilities
  EBMUD, Sonoma County Water District, Santa Clara
  Valley Water District
• Seek a variety of commercial, institutional, and
  industrial sites with
• Significant water savings potential
• Supply configuration able to measure changes in
  water usage (both inflows and outflows)
• Sites could include Schools, Food Processing,
  Food Service, Laundries, Manufacturing, Health
  Services, and Low Income Institutions or other
  suitable facilities
• Obtain extensive data on water and energy
  used/saved for distribution and fresh- and
  waste-water treatment
• Work with water agencies and the CPUC to develop
  satisfactory methods for measuring saved
  water-embedded energy

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Examples of Achieving Water-Embedded Energy
Possible Sites Water End-Uses Potential Water-saving measures
Schools, Colleges HVAC, cleaning, personal, food prep Fixtures, appliances, boilers, cooling towers
Food Processing Process level cleaning, cooking, scalding, etc Process line improvements
Manufacturing Process level cleaning, quenching, rinsing Process line improvements, rinse water recycle
Health Services HVAC, cleaning, food prep, process use X-ray film developer upgrade, steam-sterilizer upgrade
Laundries Clothes washing High efficiency washers, rinse water recycle
Low Income Facilities HVAC, personal, clothes washing, food prep Fixtures, cooling towers, appliances
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Low Income Water-Energy Opportunities

• PGE currently offers several water conserving
  high energy efficiency measures in the Low Income
  Energy Efficiency Program
• Low Flow Showerheads
• Faucet Aerators
• Leaky Water Heater Repair/Replacement
• PGE will work with the CPUC, the LIOB, CA energy
  and water utilities, and other interested parties
  to explore new opportunities for increasing water
  efficiency in low income programs.

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Low Income Water-Energy Market Possibilities
Potential Water-saving measures Est. Water Savings per Unit (Gallons/year) Est. Embedded Energy Savings (kWh/yr) Comments
Low Flow Showerhead 2,000 5 Current LIEE Measure.
Faucet Aerator 500 3 Current LIEE Measure. Near market saturation.
Leaky Water Heater Repair/Replacement varies Current LIEE Measure.
High Efficiency Toilet 14,000 76 Big savings requires high volume, often requires extensive envelope repair construction
High Efficiency Clothes Washer 6,000 32 Very Expensive
Irrigation Controller 15,000 81 Expensive, for yard work
Cooling Tower Controller 100,000 541 For large facilities with centralized HVAC
Based on avg. water-embedded energy intensity of
5,411 kWh/million gallons per CEC study.
http//www.energy.ca.gov/pier/final_project_report
s/CEC-500-2006-118.html