1. Lighting Savings Calculations for Northwest Energy Star ® Homes David Baylon

2. Current Method Energy Star ® CFL measure savings based on socket counts from existing homes Individual CFL energy savings derived by dividing “whole house” savings/lamps per home Calculation includes removal, “takeback” & regional space heating/cooling interaction Deemed Savings “average kWH/CFL lamp” = 35 kWh/yr busbar savings (or 532 kWh/home for 15 lamps)

3. Example Homes Example Plan 1 2352 SF Plan 2 2185 SF Plan 3 1310 SF Plan 4 2778 SFAverages Base Case Total kW3.392.962.066.003.60 Avg LPD (W/sf)1.441.351.572.161.63 50% Replacement Total kW2.242.171.374.062.46 Avg LPD (W/sf)0.950.991.051.461.11 Advanced Pkg. Total kW1.881.420.622.141.51 Avg LPD (W/sf)0.800.650.470.770.67 100% Replacement Total kW1.281.180.622.141.30 Avg LPD (W/sf)0.54 0.470.770.58

4. Current Lighting Design Designs developed for homes using the most efficient lamps and alternative fixtures Fixture change often not correspond to lamp numbers Much larger number of lamp sockets in new homes Design target unclear for the builders

5. Appliance & Lighting Usage SourceNAreaNon-Heat RCDP II (1990)1781,8977878 RCDP II Manufactured Homes (1990)1501,5307340 SGC (1990)601,9458111 PSE (2002-04)2702250*9260 DOE (2002)---1,648--- *Estimated

6. Residential Lighting Use Estimates Source Annual Use (kWh)Range (kWh)HoursW/sf RCDP II Manufactured Homes1,2501000 - 15001.51.4 TCV/Plan/RTF1,8181444 - 2196 2.29 interior 2.36 interior & exterior--- CALMAC CFL Metering Study (PG&E,SDG&E, SCE) 1,942 (estimated)N/A 2.28 interior 2.34 interior & exterior 1.25 (estimated) DOE2,1021469 - 25172.01.8

7. CALMAC Results = No Correlation Between House Size & Average Hrs of Lighting Use Source: CFL Metering Study – Final Report. Prepared for Pacific Gas & Electric Company, San Diego Gas & Electric Company and Southern California Edison by KEMA, Inc. February 25, 2005

8. Estimated CFL usage is equivalent to the estimated hours of usage for all lamp types based on the most recent study on run time hours for residential lighting Source: CFL Metering Study – Final Report. Prepared for Pacific Gas & Electric Company, San Diego Gas & Electric Company and Southern California Edison by KEMA, Inc. February 25, 2005 and California Baseline Lighting Efficiency Technology Report, HMG 1997

9. CALMAC Study – Hours of Use by Household Type Source: CFL Metering Study – Final Report. Prepared for Pacific Gas & Electric Company, San Diego Gas & Electric Company and Southern California Edison by KEMA, Inc. February 25, 2005

10. Proposed Method for Northwest Energy Star ® New Homes Set a baseline LPD for Residential Single Family New Construction (1.6 w/sf) Establish average hours of operation (2.1 hrs/day) Develop target LPD for whole house lighting measures Calculate electric savings from change in LPD

11. Proposed Deemed Savings Calculation for Northwest Energy Star ® New Homes Measure Lighting SystemOffset (Space Heat) LPD W/sf Use (kWh/Yr)Savings No Cooling (Th) Heat Pump (kWh) Cooling Only Base1.502529--- NW BOP1.00168684320197-60 Advanced Pkg0.801349118028285-80 Full EStar0.601012151736370-100

12. Issues Does Baseline LPD of 1.5 watts/sf seem reasonable for new construction? Does 2.1 hrs/day “full load equivalent hours” seem reasonable for whole house? Should average “full load equivalent hours” (2.1 hrs/day) be adjusted to reflect “takeback” assumptions used in retrofit analysis? Should “removal” assumption used in retrofit analysis be reflected in new homes analysis?