Residential Measures for the 7th Power Plan

RTF November 17, 2014

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Source of Key ParametersParameter Source(s)

Unit Savings at busbar (kWh) RTF, DOE TSD, secondary sources

Incremental Cost ($/MWh) RTF, DOE TSD, secondary sources

Baseline EE Saturation RBSA, ENERGY STAR, secondary sources

Number of Units (20 years) Load forecast, RBSA, ENERGY STAR, secondary sources

Achievable Technical Potential (aMW over 20 years)

Product of # Units * Unit Savings

BATHROOM AERATORS

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How to Estimate Savings?

Most TRMs and Energy Trust base savings on an algorithm

ETO savings algorithm: ΔGPM*% Max Flow*

usage/day/person*#persons*#days*%HotWater*Δtemp*DHWeff

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Need for Data % Max Flow: at what percent of maximum

flow does one generally set the faucet? usage/day usage: how many minutes per

day is the faucet running per person? % Hot water: what is the relative fraction of

hot to cold water used? Or, what is the average water temperature at

faucet? Should we include a sink-fill factor? What is the saturation of low-flow (<2.2

GPM) aerators out there?

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7P Source Summary

Measure: Aerators  Item Methods & Sources Note

Measures Described Faucet aerator for bathroom use, reducing GPM from 2.5 to 1.0  

Energy Savings Calculation Basis Based on engineering calculation using Energy Trust blessing memo, Cadmus MI study Includes wastewater savings

Applicable Stock RBSA on electric WH saturation, # of bathrooms/home  

Baseline Saturation ETO CPA assumes 65% saturation of measure

Source of baseline saturation from Seattle PUC Study of Market Penetration of Water Efficient Fixtures, 2004 - no more recent data available

Baseline HVAC Loads NA

Permutations One only  Costs ETO Blessing Memo  Measure Life ETO Blessing Memo  Savings Shape DHW - ERWH  

Achievable Ramp Rate LO Medium (new), Retro in 10 (existing)Aerators are a commonly used water saving measure. ETO and others have program, not RTF UES

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ADVANCED POWER STRIPS

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7P Source SummaryMeasure: Advanced Power Strips    Item   Methods & Sources   Note

Measures DescribedPower strips to switch off peripherals on home entertainment or workstations when main component is off

Energy Savings Calculation Basis RTF ResAdvancedPowerStrips_v1_5

Applicable Stock # of computers and TVs per home from RBSA, adjusted for those that are "powerstrip ready"

Saturation increases over load foreacst, "powerstrip ready" from ETO analysis ~5 years ago

Baseline Saturation low - 1% low product awareness, but programs have begun in 2012

Baseline HVAC Loads NA

Permutations Load sensing, infrared, or occupancy Load sensing – computer or TVInfrared – TV onlyOcc sensor – computer only

Costs Various online sources Measure Life 5 RTF assumptionSavings Shape Res Electronics from RBSA Achievability Ramp Rate LO Fast, Retro in 10

Market evolving quickly, easy to implement

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Advanced Power Strips

Number of units includes all TVs and Computers in homes, 34% feasibility for SF (based on Energy Trust study); 25% for MF/MH (assumption)

Parameter Seventh Plan (draft)

Unit Savings at busbar (kWh) 34 (load sensing) 45 (occupancy)284 (infrared)

Levelized Cost ($/MWh) -$7 (occupancy)$45 (infrared)$226 (load sensing)

Baseline EE Saturation 1%

Number of Units (20 years) 30M

Achievable Technical Potential (aMW over 20 years)

185

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Questions for RTF

Are 300 kWh savings for infrared power strips reasonable?

How should savings be decremented to account for increasing TV/computer efficiency?

Are there more recent data on applicability of power strips to home entertainment or home offices?

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SINGLE-FAMILY WEATHERIZATION

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SF Weatherization

Includes: Attic, floor, and wall insulation Windows Infiltration Control (not in 6P)

Levels of insulation and associated savings & cost taken from recent RTF workbook

Number of units based on RBSA for 7P For 6P, based on pre-1980 vintage

cohort

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SF Weatherization

RTF measures are by climate zone, HVAC system type E.g. Insulate Attic - R0 to R38 - Heating

Zone 1 (Electric FAF) For 7P, RBSA data are not robust at this

level of granularity for baseline saturations In 7P, measures are bundled by HVAC

system type at regional level E.g. Insulate Attic – R0 to R38_Electric FAF

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SF Wx Measures

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Single-Family Weatherization

Parameter Seventh Plan (draft)

Unit Savings at busbar (kWh) 35 - 2176

Levelized Cost ($/MWh) $0 – 280~$94 weighted avg

Baseline EE Saturation Varies by measure

Number of Units (20 years) 2.3M

Achievable Technical Potential (aMW over 20 years)

100

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7P Source SummaryMeasure: Single Family Weatherization  Item Methods & Sources Note

Measures Described Attic, floor, wall Insulation, window, and infiltration improvements

Energy Savings Calculation Basis SEEM models, RTF ResSFWx_v3

Applicable Stock Existing single-family homes

Baseline Saturation RBSA based on existing levels of insulation (grouped) Baseline HVAC Loads SEEM models Permutations Various pre/post R/U/CFM50 values Costs ETO database

Measure Life RTF assumptionsinsulation at 45 years, windows 25 yrs, infiltration 15 yrs

Savings Shape HVAC Elec Resistance space heat - ELCAP

Achievability Ramp Rate Retro in 10Wx programs have had long duration