DWSD Strategies to Reduce Water Loss and Energy Use MARCH 14, 2013
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1 DWSD Strategies to Reduce Water Loss and Energy Use MARCH 14, 2013 Presented by: PJ Dada City of Detroit Water and Sewerage Department Great Lakes Great Challenges Forum 2013 Oakland University
2 Detroit Water and Sewerage Department (DWSD) DWSD Provides o Water Treatment o Water Distribution o Wastewater Collection o Wastewater Treatment DWSD Customers o Retail Customers in City of Detroit o Wholesale Customers outside of Detroit
3 About DWSD Third largest municipal water and sewer utility in the United States Over $500 Million in revenue Provides services to more than 4 million retail and wholesale customers Service area of 1079 square miles Yellow - Wholesale Red - Retail
4 Water/ Wastewater Systems DWSD System Overview 5 Water Treatment Plants 20 Water Booster Stations 10 Wastewater Collection Stations 1 Wastewater Treatment Plant 7 CSO Basins 13 In-system Storage Devices 200 Remote Monitoring/Control Sites (Valve, Pressure, Sewer Meter, Precipitation Gauge, CSO outfall, Dam, Level)
5 DWSD Water Audit Overview 1. What is a water audit? It is an accounting procedure used to determine the amount of unaccounted-for water in a water distribution system. 2. When do conduct water audits? According to AWWA standards, every two years. 3. Who conducts the water audits? DWSD Staff Contractors 4. Why is there a need for a water audit? To provide an estimate of the individual components of the water loss and to make recommendations for reducing the water loss volume where practical.
6 DWSD Water Audit Overview Implementation of recommendations will reduce water losses. All water consumption is Revenue Water or Non-revenue Water (NRW). Revenue Water includes all water which is charged to customers and funds the utility. Non-revenue Water includes all water which produces no revenue and is the sum of all authorized unbilled uses, Apparent Losses and Real Losses. Currently DWSD Estimates the volume of unaccounted for water (UFW) system wide by subtracting the volume of water sold from the volume of water produced.
7 DWSD Strategies Steps to DWSD to Reduce Real and Apparent Water Loss: 1. Continue leak surveying as part of a comprehensive maintenance program: Since 2005, nearly 3,500 miles have been surveyed by DWSD and its consultant. Approximately 30 MGD of leaks identified. Estimated savings from leak repairs equals $5M. 2. Record valve closure and opening accurately, since partially closed valves affect water distribution through the system (1125 valves). 3. Repair or isolate inoperable valves. 4. Projects are underway to update the accuracy of High Lift Pumping at the plants (venturi meter rehabilitation, improvements to pumps, motors & instrumentation).
8 DWSD Strategies Steps DWSD to Reduce Real and Apparent Water Loss: 5. Establish a program to continue water main replacements. 6. Decrease response time to repair water main failures and leaks. 7. Install fire hydrant security devices to restrict unauthorized access. 8. Shutting off services to vacant and abandoned homes. 9. Installation of DWSD s new retail meters and AMR (Automatic Meter Read) system will greatly improve the estimate of Apparent Losses. 10. Review meters on annual basis to ensure proper reading and sizing (low flow rates, max hour flows)
9 DWSD Strategies Other Measures: Evaluating System Operations Reducing Operating Pressures Altering Supply Balance Between Two Master Meters Approach Hydraulic Modeling & Evaluation Field Testing Implementation of Recommendations
10 Water Audit Benefits Summary of water loss program benefits: 1. Proactively addressing water loss saves money. 2. Overall operation costs are reduced, the savings passed on to retail and wholesale customers. 3. Optimizes the dollars expended to operate and maintain system. 4. Allows the community to re-prioritize their water system capital program. 5. Improves creditability with stakeholders. 6. Reduce the usage of the Great Lakes water.
11 DWSD ENERGY MANAGEMENT PLAN MARCH 14, 2013 Presented by: PJ Dada City of Detroit Water and Sewerage Department Great Lakes Great Challenges Forum 2013
12 DTE Electric Expenditure Fiscal Year Electric Expenditure Fiscal Year Electric Expenditure Sewer Fund 32% Sewer Fund 29% Water Fund 68% Water Fund 71% $47,183,577 $49,783,396
13 Energy Management Approach Analyze Energy Data Management Meter Energy Use in Facilities Integration into the Organization QA/QC Energy Supply Management Implement Efficiency of Systems and Equipment
14 EMP Major Components 1. Meter DWSD Facilities 2. Electric Rate Schedule Evaluation 3. Experimental Load Aggregation Provision (ELAP) 4. Pump Optimization Program (POP) 5. Peak Shaving 6. Energy Conservation Measures (ECM) 7. Demand Management 8. Solar Power Pilot
15 Meter DWSD Facilities Establish real-time energy measurement and power quality at DWSD pump stations (30), water treatment plants (5), wastewater treatment plant, CSO basins (7), and office buildings/yards (6). Sub meter process areas Water Plant Processes Wastewater Plant Processes Data Centers
16 Meter DWSD Facilities No. Booster Stations Type 1 ADM CM 2 EAS PM 3 ELC PM 4 FRD PM 5 FRK CM 6 HAG CM 7 IMC CM 8 JOY CM 9 MCH PM 10 NSC CM 11 NWB CM 12 NWS PM 13 ORN PM 14 RCH CM 15 RSV - 16 SCH CM 17 WCH PM 18 WCK CM 19 WSC CM 20 YPS CM No. Sewage Station Install 1 Belle Isle PM 2 Bluehill PM 3 Conner PM 4 Fairview PM 5 Fischer PM 6 Freud PM 7 Northeast PM 8 Oakwood PM 9 Woodmere PM No. Office/Yards Install 1 CSF CM 2 WBB CM 3 West Yard PM No. WTP Install 1 Lake Huron CM/PM 2 Northeast CM/PM 3 Springwells CM/PM 4 Southwest CM/PM 5 Water Works CM/PM No. CSO Basin Install 1 7 Mile PM 2 Conners PM 3 Hubbel Southfield PM 4 Puriten Fenkell PM Design Completed
17 Savings from DTE Rate Structure Rate Change D3 to D6 Wick Road Booster Station Franklin Booster Station Schoolcraft Booster Station Conner Sewer Station Fairview Sewer Station 40 sites from E5 to D3 Total Yearly Savings Annual Savings $33,157 $244,955 $45,558 $66,118 $178,631 $224,000 $792,419
18 Aggregate DWSD Sites DTE approved DWSD s application for aggregating 10 site demands into a single account. DWSD s goal is optimize water and sewer system sites to use power at different times that will reduce cost overall. Total power used at different rates is beneficial in cost as varies throughout the day. Estimated savings from this program will be $2.5M/year.
19 Pump Optimization Program (POP) A computer Pumping Optimization Program (POP) that is able to serve as a guideline for the System Controls Center (SCC) operators to establish optimal pumping operations. The POP evaluates the characteristics of a potentially large number of pump groups to determine the most cost-effective group of pumps that meet a specified pressure set point for a given booster station discharge.
20 Peak Shave Pilot Peak shave operation of the generators will allow the generators to share the facility load. The generators will only take the load that is over the facility contract capacity. Peak shaving will save DWSD from the demand charge and the yearly minimum charge associated with the demand charge. Peak shaving is under DTE s Rider 3 rate which requires a reservation charge. DWSD and DTE are currently negotiating the reservation charge.
21 Lighting Retrofit Audits Room Type Lighting Types Quantity Total Fixtures Total Watts Proposed Replacement New Total Watts Total Savings
22 DTE Your Energy Savings Program Outline Program Program and Project Eligibility Pre-Notification Application Process Final Application Review Process Installation Identify Timetable Requirements 90 days from DTE letter approval Inspection Incentive Checks
23 Lighting Retrofit Savings Item Amount Total procurement cost of Lighting retrofits $ 519, Labor and Disposal $726, DTE Rebate applied $ 188, DWSD cost after rebate $1,057, Approximate Energy Savings per year $500K - $550K Payback period 2 2 1/2 years * Energy savings are based on kwh saved and $0.11/kWH
24 Computer Power Management DWSD implemented sleep feature for 1200 Desktop PCs in 2009 Electricity Consumption down by $20 40/PC/yr * Cooling Loads (Saves additional $3-20/PC/yr) * Peak Load Demand Charges Air Pollution Carbon Footprint Executive Order requires federal agencies to activate sleep features * source
25 Computer Power Management Typical Savings for an organization with 1,000 computers $40,000 in electricity, or $160,000 over 4 years * Avoid 350 tons of greenhouse gas emissions * Approximate DWSD savings from computer power management $48,000/year * source
26 Solar Power Pilot CSF offered unique roof space opportunity Existing roof materials and age Capacity of roof structure Partially funded by DTE Recognized by DTE as a power generation source
27 Solar Payback ROI Cost of Solar Project before rebates: $114, DTE Solar Currents up front REC payment: $47, Total Net Cost: $67, Renewable Energy Credit: $0.11/kWH generated
28 Demand Management WSC Demand Management WSC HALF HR WSC PEAK WSC 65%
29 11/3/2012 0:00 11/4/2012 0:00 11/5/2012 0:00 11/6/2012 0:00 11/7/2012 0:00 11/8/2012 0:00 11/9/2012 0:00 11/10/2012 0:00 11/11/2012 0:00 11/12/2012 0:00 11/13/2012 0:00 11/14/2012 0:00 11/15/2012 0:00 11/16/2012 0:00 11/17/2012 0:00 11/18/2012 0:00 11/19/2012 0:00 11/20/2012 0:00 11/21/2012 0:00 11/22/2012 0:00 11/23/2012 0:00 11/24/2012 0:00 11/25/2012 0:00 11/26/2012 0:00 11/27/2012 0:00 11/28/2012 0:00 11/29/2012 0:00 11/30/2012 0:00 12/1/2012 0:00 12/2/2012 0:00 12/3/2012 0:00 12/4/2012 0:00 Demand Management 4500 WSC Demand Management WSC HALF HR WSC ToTAL POWER 65% Demand
30 Overall Yearly Savings Program Yearly Savings amount Rate Change $800, Lighting Retrofit $600, Computer Power Management $40, Total $1,440, Program Savings Potential Future Savings ELAP $ 2,500, Demand Management $ 500, Peak Load Shaving $ 500, Lighting Retrofit Phase II $ 650, Real-Time Pump Optimization $ 500, Process Audits $ 1,000, Total $ 5,650,000.00
31 Questions & Answers
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