Washington Energy Star and Built Green Homes Measure Update New Measure Proposal August 12th,

Measure background Measure Name: Energy Star Homes and WA Built Green Homes Measure Type:UES Measure Category:Proven Measure Sector:Residential Sunset Date:August, 2017 Reason for Update:Change in State Code and Energy Star Standard 2

Staff Highlighted Areas Cost of infiltration reduction. Should these differ from infiltration reduction on existing homes? Assumption $ 250 / 0.1 ACHn 3

Specs Development Background WA 2012 residential code allows a builder to choose one of many paths RTF staff worked with WA department of Commerce, NW Energy Star and Ecotope Consulting to define typical code compliance paths RTF Subcommittee formed to help draft Energy Star and Built Green home specs for WA Built Green 3 or 4 star will use same specs as Energy Star These specs provide a Reference Home that may be built to prescriptively or used as an energy use modeling target. Builders to use NW REMRate as a Energy Star compliance tool for RTF approved trade-offs. 4

Measure Summary: Gas Heated Homes 5

Measure Summary: Electric Homes 6

Energy Savings Calculations Simulations conducted in SEEM 96 RTF approved new construction heating calibration applied Staff proposed cooling calibration applied 7

Incremental Cost Incremental cost derived from the following sources: Standard Information Workbook 6 th Power Plan Appendix Existing RTF workbooks Energy Trust Resource Assessment Cost of infiltration reduction. Should these differ from infiltration reduction on existing homes? Assumption $ 250 / 0.1 ACHn 8

Estimated Useful Life EUL of new construction measure is set at 45 years Measures with EUL < 45 years have recurring cost at EUL Source for EUL: Existing measure workbooks DEER EUL consistent with new construction measures in other states 9

Energy Savings Comparison 10 Note: Existing kWh are an average of all Existing Energy Star New Construction measures. There were three different paths to Energy Star: Envelope, Equipment and Ducts Inside path.

Incremental Cost Comparison 11 Note: Existing Cost are an average of all Existing Energy Star New Construction measures. There were three different paths to Energy Star: Envelope, Equipment and Ducts Inside path.

Cost Effectiveness Comparison 12 Note: Existing TRC are an average of all Existing Energy Star New Construction measures. There were three different paths to Energy Star: Envelope, Equipment and Ducts Inside path.

RTF Proposed Motion: “I _________ move that the RTF: Adopt the WA Energy Star and Built Green measures and set the sunset date to August