Deemed Savings Update: ECMs in Display Cases Ben Cartwright PECI January 5, 2009

Acknowledgements We would like to thank the following utilities for support BPA PSE AVISTA

Purpose Deemed measure approval Updated savings for ECMs in refrigerated display cases Measure Name Shaded Pole to ECM in Refrigerated Display Cases

Agenda Background Description of Measure History Energy Savings Summary of Analysis Analysis Methodology Findings Calculation Methodology PECI Experience / Market Results Current Savings Revised/Proposed Savings Cost Measure Life Technical and Program Specifications Conclusion

Background Description of Measure: Replace standard efficiency shaded pole motor with ECM in refrigerated display cases ◦Savings from reduction in input wattage (direct/auxiliary savings) ◦Savings from reduction in heat load with ECM replacement (refrigeration savings)

Background History: RTF updated savings SP- ECM in Walk-Ins (3/09) ◦Weighted motor wattages based on size from market data ◦Weighted case temperatures based on audit data ◦Deemed kWh savings increase of 50% Proposing savings for Display Case SP to ECMs using same approved methodology Summit Blue Energy Smart Grocer program evaluation: 469 kWh

Energy Savings Summary of analysis: Reviewed base case and efficient case wattages Analyzed existing historical data vs. “real world” data Revised savings

Energy Savings Description of Energy Savings Methodology Issue: Current savings use 100% 9 watt output – research indicates larger motors in the mix Review and research motor data Manufacturer’s data: Tyler, Hussmann, GE GrocerSmart © database store audits Invoices from installed measure and audit data Established ranges: HP mix (establishes wattage for direct/aux. savings) Case temperature mix (establishes refrigeration savings )

Energy Savings Findings – Motor HP Mix: Motor HP market based on actual invoices ◦3,652 installed motors from 46 different sites, as invoiced » 3,328 motors: 9 watt (91%) » 122 motors: watt (3%) » 202 motors: 37 watt (6%)

Energy Savings Findings – Case Temperature Mix Case mix temperature data ◦Grocery store audit data: 223 Stores; 23,986 motors » 67% medium temp (16,071 motors) » 33% low temp (7,915 motors)

Energy Savings Calculation Methodology Direct/Auxiliary Savings ◦(Baseline Input Watts) – (Efficient Case Input Watts) ◦Motors run 8760 hours for medium temp ◦Motors run 8395 hours for low temp (1 hour/day defrost)

Energy Savings Calculation Methodology Refrigeration Savings ◦Full Load Hours (FLH) higher for low temp cases ◦“System” Energy Efficiency Ratio (EER) lower for low temp cases ◦Degradation Factor (DF) is.98 = condenser degradation penalty

Energy Savings Calculation Methodology Conclusion Direct/Auxiliary savings increase due to the added mix of larger motors Existing case temperature mix confirmed from additional analysis

Results Current SP to ECM Measure Energy Savings Existing measure savings based on: ◦9 watt motor only ◦Medium and low temp cases mix (69%/31%) ◦337 kWh/motor Measure Baseline Fan Watts (Shaded Pole) Efficient Fan WattskWh Energy Savings 9 Watt OutputInput Watts kWh/motor Med/Low Temp Shaded Pole to ECM in display cases

Results Revised/Proposed Energy Savings: Increased pre (base case) and post (efficient case) wattage based on market audit data using ◦Weighted blend of wattages (direct/auxiliary) savings » 9 watt (91%), watt (3%), 37 watt (6%) ◦Display case temperature weighted blend (refrigeration) savings » 33% low temp » 67% medium temp

Results Revised/Proposed Energy Savings: New kWh based on weighted blend of motor wattages and case temperatures: ◦ 453 kWh/motor

Cost Assumptions/Data Current Full Measure Cost: $110/motor Equipment cost confirmed from submitted PNW invoices ◦9 watt: $48/motor average ◦16-23 watt: $46/motor average ◦37 watt: $50/motor average Labor cost confirmed from PNW invoices and industry research ◦PNW: $50/motor ◦PG&E SP to ECM 2008 deemed measure workpaper » $41/motor ◦Southern California Edison SP to ECM 2007 workpaper » $36.45/motor

Measure Life Assumptions/Data Measure Life/Effective Useful Life is 15 years ◦Southern California Edison 1, PG&E 2 and BPA 3 program all use 15 year measure life for ECMs » 1 Energy Savings Potential for Commercial Refrigeration Equipment. June U. S. Department of Energy. Arthur D. Little. p 5-51 » 2 CALMAC Protocols, Appendix F, Effective Useful Live Values for Major Energy Efficiency Measures, September 2000 » 3 Council Plan 1996; 15 year EUL used for all Retrofit HVAC Systems & Controls including motor retrofits

Technical/Program Specifications Terms and Conditions: ECMs replace shaded pole fan motors in refrigerated display case ◦“Applicable to existing standard efficiency shaded pole evaporator fan motor for refrigerated display cases. Shaded pole motors must be replaced by electronically commutated motors (ECMs). Incentive is based on number of ECMs installed.”

Conclusion/Summary Increased kWh savings requested based on: ◦Installed motor mix of motors > 9 watts » Based on actual PNW program invoices ◦Weighting of medium temp vs. low temp cases » Based on actual GrocerSmart audit data Approval for deemed kWh savings of 453 kWh/motor