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Study 1: “Statewide and Regional Water-Energy Relationship Study”

Study 1: “Statewide and Regional Water-Energy Relationship Study” Study 2: “Water Agency and Function Component Study and Embedded Energy-Water Load Profiles”. California Public Utilities Commission Embedded Energy in Water.

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Study 1: “Statewide and Regional Water-Energy Relationship Study”

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  1. Study 1: “Statewide and Regional Water-Energy Relationship Study” • Study 2: “Water Agency and Function Component Study and Embedded Energy-Water Load Profiles”

  2. California Public Utilities Commission Embedded Energy in Water On January 19, 2007, the CPUC opened a water-energy proceeding to consider whether/how energy “embedded in water” should be recognized as an energy efficiency resource. Decision 12-07-050: • Authorized the IOUs to conduct water-energy pilots • Directed that three studies be conducted: • Study 1 - Statewide and Regional Water Energy Relationship Study • Study 2 - Water Agency and Function Component Study and Embedded Energy -Water Load Profiles • Study 3 - End-Use Water Demand Profile Study

  3. Study 1: Intro and Purpose Study 1: Statewide and Regional Water-Energy Relationship • Develop a predictive model of the functional relationship between wholesale water deliveries in California and the energy used to deliver that water. • Increase understanding of the relationship of energy and potable water systems at the wholesale level. • Project the potential range of statewide energy impacts given a variety of future conditions. Developing the first model to analyze and forecast energy use by wholesale water supply systems statewide

  4. Study 1: Challenges • Large number of systems and entities with complex relationships • California’s water system is comprised of multiple federal, state, regional and local water agencies, joint powers authorities and special districts. • The state’s water-energy balance is comprised of complex delivery, storage and transfer relationships among all of these entities.

  5. Study 1: Segment Focus Source Focus of Study 1 Supply & Conveyance Water Treatment Water Distribution End Use: Agriculture, Residential, commercial, industrial Recycled Water Treatment Recycled Water Distribution Discharge Wastewater Treatment Wastewater Collection Source “Refining Estimates of Water‐Related Energy Use in California”, Navigant Consulting for the California; Energy Commission Public Interest Energy Research division (PIER), CEC‐500‐2006‐118, 2006. Energy Consuming Segments of California’s Water-Use Cycle

  6. Systems Modeled • Nine large or wholesale systems • Additional supplies were added to complete the picture: • Groundwater • Local Surface Water • Recycled Water • Desalination (Brackish and Seawater) SFPUC MID CVP LAA (LADWP) SCWVD CRA SWP MWD SDCWA

  7. Study 1: Model Highlights The model is designed to be flexible and user-friendly • Models both regional and statewide water supply and associated energy use by each wholesale water system and water supply • Transparent, easy to understand, and easy to use – Excel based model • Easily adjustable to evaluate a range of scenarios • Integrates supply constraints • Monthly energy results • Projects energy use in 2020 and 2030

  8. Study 1: Scenarios The model will be used to analyze various future scenarios for the state water system • “Given a specific water delivery requirements … what is the expected energy use?” • Work plan specifies analysis of key regulatory and policy decisions inside and outside of California for example: • District Judge Wanger’s decision that required export pumping reductions in order to protect delta smelt • Policies promoting water conservation • The Study Team met with stakeholders to discuss other policies to model

  9. Study 1: Scenarios Scenarios are designed to capture the range of future possibilities • There are too many variables and policies to test separately for our report • Two scenarios were designed to estimate the range of future energy impacts in 2020 and 2030 • Scenario 1 – A Low-Energy Scenario that assumes low demand and a package of policies that will reduce energy consumption • Scenario 2 – A High-Energy Scenario that assumes high demand and a package of policies that could increase energy consumption • These are intended to represent the range of likely outcomes to bracket the majority of other scenarios

  10. Model’s Web Interface

  11. Facility and Region Information

  12. Model Input/Output:Total Energy

  13. Monthly Energy Profile

  14. Study 2: Intro and Purpose Study 2: Water Agency and Function Component Study and Embedded Energy-Water Load Profiles • Increase understanding of the relationship of energy and water/wastewater operations at the retail water agency/functional level. • Determine the range of energy intensity of water operations and key drivers • Develop 24-hour energy profiles of water and wastewater agencies Producing the most detailed analysis to date of the range of energy intensities observed in California retail water systems

  15. Study 2: Segment Focus Source Focus of Study 2 Supply & Conveyance Water Treatment Water Distribution End Use: Agriculture, Residential, commercial, industrial Recycled Water Treatment Recycled Water Distribution Discharge Wastewater Treatment Wastewater Collection Source “Refining Estimates of Water‐Related Energy Use in California”, Navigant Consulting for the California; Energy Commission Public Interest Energy Research division (PIER), CEC‐500‐2006‐118, 2006. Energy Consuming Segments of California’s Water-Use Cycle

  16. Study 2: Previous Body of Knowledge Previous body of knowledge on the range of energy intensities is based on a few case studies.

  17. Study 2: Previous Body of Knowledge Previous data on 24-hour energy profiles is also based on a few case studies; data did not cover multiple facility types. Sample Central Valley Irrigation District Power Load Shape for July 15

  18. Study 2: Agency Selection Study 2 selected 30 water and wastewater agencies for data collection that were deemed “representative” • These agencies collectively comprise at least 90% of the most important types of water-energy relationships in California’s water resources • Criteria for selection included • Types of water agencies: Urban, Agricultural, Water, Wastewater • Geographic region • Treatment technologies/requirements • Service area topology • Energy service provider

  19. Study 2: No. California Agencies Selected SAN JOSE WATER COMPANY

  20. Study 2: So. California Agencies Selected

  21. Study 2 Data issues • Data collection from water and wastewater agencies • Resources/Time • Availability • Different formats • Agencies Unique • Agency Profiles • System details • Results • Water and energy metered at different time steps • Database approach: ACCESS

  22. Data Analysis Tool: Graphical Interface Summer Average Water Demand Summer High Water Demand Summer Low Water Demand Winter Average Water Demand Winter High Water Demand Winter Low Water Demand Summer Peak Energy Demand

  23. Typical Load Profile

  24. Monthly Average Energy Intensity by Facility

  25. Energy Intensity Over the Year

  26. Status of Studies 1 and 2 • Final Draft Reports being submitted to CPUC • Includes results and recommendations • Draft Studies to be posted on CPUC Website in mid-May • Study 1 Model and Study 2 Database Tool also available on line • CPUC Public Workshop scheduled for May 26 • Receive public comments through mid-June • Final Reports and Tools available in July

  27. Wrap-Up Thank you! To stay informed log into: http://www.energydataweb.com/cpuc/default.aspx Subscribe to the topic: “Embedded Energy in Water Studies” Bill Bennett GEI Consultants, Inc. bbennett@geiconsultants.com (916) 631-4564 Laurie Park Navigant Consulting Inc. LPark@navigantconsulting.com (916) 631-3274

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