Deemed Energy Savings and Cost-Effectiveness of 80-Plus Power Supplies

1. Deemed Energy Savings and Cost-Effectiveness of 80-Plus Power Supplies RTF January 2007

3. From Linear to Switching Power Supplies

4. Published Estimates • Ecos (August 2005) • 82 kWh per unit residential • 90 kWh per unit commercial • 85 kWh weighted average • NEEA (March 2005) • 76 kWh per unit residential • 88 kWh per unit commercial • 74 kWh per unit commercial with network off • 82 kWh per unit weighted average net of network off

5. Key Factors for Binned Savings Estimates • Hours in each power consumption bin • Developed by Intel & Ecos • Set to fit total consumption • Total consumption based on several sources • Roth 2002, LBL for Energy Star, Ecos • Efficiency by power consumption bin • Base case: Intel 2005 required efficiency • 80-Plus: Bench tests conducted by EPRI-PEAC • Time in standby mode • LBL “After Hours” report

6. Changes Since Estimates • Higher computer power requirements • Increase savings • Improving efficiency of non 80-Plus power supplies • Decrease savings • Identified added savings from power factor correction • Add ~25 kWh • Penetration of network off-hours control • Unknown

9. Savings from Power Factor Correction

10. Cost Estimates • Incremental cost of $5/unit • Declining to $2.50 by 2010 • NEEA program costs estimates ~ $40 per unit • Lifetime: 4 years • No O&M costs • NEEA B/C ratio: Over 5.0 for venture plus market effects

11. Issues • Update NEEA assumptions? • Include indirect savings from power factor? • Adopt Ecos estimate for servers? • Estimate HVAC interactions?

12. Options

13. Recommendations • Stick with NEEA estimate for now • Ignore savings from power factor correction until Ecos adopts them • Ignore HVAC interaction • Review Ecos server application savings when programs are deployed for servers