Standard Information Workbook Update Regional Technical Forum May 21, 2013

What is the Standard Information Workbook (SIW)? A centralized data resource containing regionally representative costs, non-energy benefit data, and other measure-related data that are common across multiple measures Data are recorded and documented in the SIW (an Excel Workbook), which will be available on the RTF website Provides automatic conversion from data-year dollars to base-year (2006) dollars using Council’s GDP deflator Provides a consistent platform for cost data and analysis 2

History of SIW Development Contract awarded in August, 2012 to EES (Kevin Smit) EES gathered data from a number of NW organizations to populate the SIW Contributors included ETO, Fluid, PNNL, Avista, NEEA, and WSU EES presented draft SIW to the RTF during the January 2013 meeting RTF suggested a few changes and issues to review before adopting the SIW 3

Brief Tour of the SIWSIW 4

Suggested Updates from Last SIW Presentation (1/23/2013 RTF Meeting)Last SIW Presentation CFL Costs – Check to see if sales tax is included in NEEA CFL cost study; if so, remove Labor Costs – Include regional labor costs if possible (previously at state level) PTCS Duct Sealing Cost (SF/MF) – Filter out projects which do not meet the PTCS specification Window and Insulation Costs (SF/MF) – Check current estimates against other data sources (Tacoma provided program data) Sales Tax Rates – Correct sales tax rates for WA and ID Level of Uncertainty – All measures – Indicate confidence interval (where possible) or degree of uncertainty for SIW values 5

Summary of Updates Changes to SIW Based on RTF Comments/Meeting Minutes – CFL Costs Contacted KEMA (author of NEEA CFL study) about CFL sales tax inclusion CFL costs in study do not include sales tax, therefore do not need to be adjusted – Labor Costs: Updated state-level labor costs and added city/regional labor costs where available 1 – PTCS Duct Sealing Cost (SF/MF): Costs now based only on projects meeting the PTCS specifications for post-leakage / leakage reduction. – Sales Tax Rates: Corrected WA and ID tax rates – Level of Uncertainty – All measures: Added appropriate indicator of uncertainty for point estimates in SIW using same procedure used in measure workbooks – Window and Insulation Costs (SF/MF): Updated costs based on additional data provided by Tacoma Power (see next slides for details) 6 1 U.S. Bureau of Labor Statistics, Occupational Employment Statistics.

Insulation and Window Cost Updates RTF staff included additional data provided by Tacoma Power, including installation costs for insulation (attic, floor, wall) and windows. RTF Discussion Point: RTF staff modeled insulation costs in a few different ways, each with their own pros and cons – Bin method Pro(s) – most representative of observed costs where N is large (e.g. 1,000) Con(s) – costs noisy where N is small (e.g. 1) – Slope method Pro(s) – simplest of the methods (1 variable), takes advantage of all data points (i.e N is large) Con(s) – method purely driven by incremental R value, does not model fixed costs – Slope + intercept method Pro(s) – fairly simple model (2 variables); models fixed and variable costs Con(s) – does not capture non-linearity of costs which the bin method can capture 7

Insulation and Window Cost Updates (Contd.) 8 ∆R Value (Single Family)

Insulation and Window Cost Updates (Contd.) 9 ∆R Value Fewer data points makes the story more complicated for Multi-Family… Slope + intercept method Slope method

Insulation and Window Cost Updates (Contd.) Additional data provided by Tacoma Power for window installations was appended to existing ETO dataset. The method of analysis was unchanged. RTF Discussion Point: Single family window upgrades are more expensive than multifamily upgrades. – Upgrade to Class 30 costs $15.94/sf for multifamily installations and $20.70/sf for single family installations. – This difference could be due to: economies of scale in multifamily applications, aesthetic adders in single family installations – Should multifamily costs be used for single family? 10

Summary of Updates (continued) Other Additions to SIW – Residential and commercial lighting HVAC interaction factors (by building type, 6 th plan) – Heating and Cooling Degree Days for prototype cities (TMY3) – NW-specific rental costs for metering equipment (gathered by Mark Kendall in Nov. 2012) – Water/wastewater costs, with and without embedded energy (same costs already used in the Commercial Clothes Washer and Showerhead measures passed by the RTF in April)Commercial Clothes Washer and Showerhead measures passed by the RTF in April 11

Summary of Updates (continued) – Updated measure lifetime table with the measures passed in April Plan going forward is to continually update SIW Lifetime Reference Table as UES measures are approved – Copied the cost section of the measure summary into each tab to align with measure workbooks 12

Future Additions to the SIW Similar to the guidelines, the SIW is a living document that will be updated periodically. Some future additions to the SIW have already been proposed: – DHP costs – Electric and gas DHW efficiencies – EER values for commercial refrigeration equipment – Water mains temperatures by region (as well as ∆T’s for appliances if possible) – Other suggestions? 13

Staff Proposal To adopt the default values currently proposed in the Standard information Workbook for use in completing measure assessments. 14

Decision “I _______ move to adopt the default values currently proposed in the Standard information Workbook for use in completing measure assessments.” 15